I want to develop a registration form employees based on different steps like company,salary,interview,pors and crons etc. they are pages for the registration process. Can anyone tell me how to develop this kind of functionality?

while googling and reading documentation and API, I've seen multiple solutions for "combining" 2 forms into one, and thus creating a multistep form.  What I want though, not even sure if it's doable, is to "split" my (huge) user registration form into 2 steps, where the value of one field (the only one in step 1) would determine which fields should show up in step 2.  I wouldn't like to drop the entire registration form and re-create it in code or in another way and somehow re-implement the whole user registration process. Is that possible?  EDIT: to avoid misunderstandings, what I need to do is an "actual" multistep form, with submitions between steps, and not some front-end handling. That is, I want the whole thing to be javascript independant.  EDIT2: to clarify even further, the task is figure out how/if possible to pretty much split any "edit" form to 2 parts. The current question does ask about the user/edit and/or user/register form specifically, but in order to come up with a more generalized solution, one might also want to split a node/edit form in to 2 parts. That's what I am really asking about. Splitting an entity/edit form in to 2 (or more) steps.


Phrasal verbs are usually two-word phrases consisting of verb+adverb or verb+preposition.  Like many other verbs, phrasal verbs often have more than one meaning.  For instance:   Back up means reverse:     You'll have to back up your car so that I can get out.  Back up means support:     My wife backed me up over my decision to quit my job.    Can we switch the word order?      You'll have to back your car up so that I can get out.     My wife backed up me over my decision to quit my job.     Is there any hard and fast rule about the usage of phrasal verbs?

Both seem to be in common usage, but is there a nuanced difference about when one is more appropriate than the other? Thanks.


I want to make a turn-based game where the player is given "opportunities for attack." An image of the in-game sprite character appears when it's the player's turn to attack. The player can mouseover the various parts of the image, which will highlight that specific body part, like so:    The player can then choose to attack that given body part.   To do this, I was thinking of adopting the "grid" method, and put my image within a 2D array... with each region of the body mapped to a certain square, like so:    Or, I could generate a pixelated version of the in-game sprite within a grid to begin with, so I would already have the mappings, like so:     I'm not sure:   how to partition the image up so that each section is represented meaningfully in the matrix if this is the right way of doing this   Any guidance would be helpful

Say for a game with irregular hotspots (say Risk, or a strategy game like Paradox's Hearts of Iron or Crusader Kings), how do you   Define a non-rectangular hotspot of irregular shape (much like a territory on a map?), in code? What tool can you use to trace out the hotspot and import into your game? What is the algorithm for detecting if someone has clicked within such a hotspot?


For example, Voltage X Current. X and versus are understandable, but a slightly different X would be better.

I know what my symbol or character looks like, but I don't know what the command is or which math alphabet it came from. How do I go about finding this out?


I'm confused which type I use to create model in project, Struct or Class? There're about ten struct and some collections. I'm a newbie.

When should you use struct and not class in C#? My conceptual model is that structs are used in times when the item is merely a collection of value types.  A way to logically hold them all together into a cohesive whole.  I came across these rules :   A struct should represent a single value. A struct should have a memory footprint less than 16 bytes. A struct should not be changed after creation.   Do these rules work? What does a struct mean semantically?


I accidentally closed the panel that has a red circle (I dont know the name of it lol). I had to close everything and load the project again and untick the 'load UI' to restore that panel again. Is there a shortcut to open/close it similar to properties and toolbar panel?      I tried the answers from the duplicate but I'm talking about specifically the panel on the right side with the red circle on it. I'm just wondering if it has a shortcut button like the toolbar T and properties N panel.

I can't find a way to close a view panel, in particular the horizontal at the bottom, is pretty useless to me at this moment.


[Preface: I have seen similar questions, but that did not help me and so this new question. To explain in more detail, I followed the steps in , without rectifying the problem]  I am trying to install ccmake.  However, I get the following error:  sudo apt-get install cmake-curses-gui Reading package lists... Done Building dependency tree        Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation:  The following packages have unmet dependencies:  cmake-curses-gui : Depends: cmake (= 2.8.7-0ubuntu4) E: Unable to correct problems, you have held broken packages.   I tried sudo apt-get -f install, but it did not help.  I am unable to find broken packages either.

Occasionally, when I'm installing stuff, I get an error like the following:  Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation:  The following packages have unmet dependencies:  package1 : Depends: package2 (>= 1.8) but 1.7.5-1ubuntu1 is to be installed E: Unable to correct problems, you have held broken packages.   How can I resolve this?


I've got a 500gb and a 31gb disks in my laptop. 31gb contains Ubuntu but I need access to the 500gb (I don't know its label or volume). How do I do it?

I read some resources about the mount command for mounting devices on Linux, but none of them is clear enough (at least for me).  On the whole this what most guides state:  $ mount (lists all currently mounted devices)  $ mount -t type device directory (mounts that device)  for example (to mount a USB drive): $ mount -t vfat /dev/sdb1 /media/disk   What's not clear to me:   How do I know what to use for "device" as in $ mount -t type device directory? That is, how do I know that I should use "/dev/sdb1" in this command $ mount -t vfat /dev/sdb1 /media/disk to mount my USB drive? what does the "-t" parameter define here? type?   I read the man page ($ man mount) a couple of times, but I am still probably missing something. Please clarify.


Assume I have a program that executes the following pseudocode  x = 1 for 0 to n     y = random real in [0,1)     if y < x         x = y return x   What is the expected value of the return of this function wrt to n?  In english, set X to 1000.  Choose a random real in the half-open interval [0,1) n times, setting the minimum to X.  What is the expected value of X in terms of n?

$x_{1}...x_{n}$ are independent continuous random variables with common distribution function $F(x)$,consider the order statistics $(x_{(1)},...,x_{(n)})$, compute $E(F(x_{(n)})-F(x_{(1)}))$  I have no idea to this problem, anyone could help me? Thanks!


Given that $X\sim\exp\left(1\right)$ and $Y\sim\exp\left(1\right)$ independent, find $f_{X|Z}(x|z)$ where $Z=X+Y$. What I did: if $Z=X+Y$ then $f_{Z,X}(z,x)=f_{X}(x)f_{Y}(z-x)$ so we get: $$ f_{Z,X}(z,x)=f_{X}(x)f_{Y}(z-x)=\left(e^{-x}I_{\left\{ x\geq0\right\} }\right)\left(e^{-(z-x)}I_{\left\{ z-x\geq0\right\} }\right)=e^{-z}I_{\left\{ x\geq0\right\} }I_{\left\{ z\geq x\right\} } $$ Then we can use $f_{X,Z}(x,z)=f_{Z|X}(z|x)f_{X}(x)$ and get: $$ f_{Z|X}(z|x)=\frac{f_{X,Z}(x,z)}{f_{X}(x)}=\frac{e^{-z}I_{\left\{ x\geq0\right\} }I_{\left\{ z\geq x\right\} }}{e^{-x}I_{\left\{ x\geq0\right\} }}=e^{-z}e^{x}I_{\left\{ x\geq0\right\} }I_{\left\{ z\geq x\right\} } $$ But the solution should be $z^{-1}$. What did I do wrong? I used those two formals from:  and I think they are valid. Edit: I didn't use $f_{X,Z}(x,z)=f_{Z|X}(z|x)f_{X}(x)$ right. I need to calculate $f_Z(z)$ instead of $f_X(x)$. I calculated $f_{X,Y}(x,y)$: $$ f_{X,Y}(x,y)=f_{X}(x)\cdot f_{Y}(y)=e^{-x}e^{-y}I_{\left\{ x\geq0\right\} }I_{\left\{ y\geq0\right\} }=e^{-x-y}I_{\left\{ x\geq0\right\} }I_{\left\{ y\geq0\right\} } $$ Then we get: $$ \begin{align*} f_{Z}(z)&=\int_{-\infty}^{\infty}f_{X,Z}(x,z-x)dx=\int_{-\infty}^{\infty}e^{-x-(z-x)}I_{\left\{ x\geq0\right\} }I_{\left\{ z-x\geq0\right\} }dx\\&=\int_{-\infty}^{\infty}e^{-z}I_{\left\{ x\geq0\right\} }I_{\left\{ z\geq x\right\} }dx=\int_{z}^{\infty}e^{-z}dx \end{align*} $$ Which does not converges. What's the issue?

Let X,Y be i.i.d. exponentially distributed with parameter $\lambda$. Show that for $Z:=X+Y$ and a measurable, non-negative function $h$ we have:   $\mathbb{E}(h(X)|Z)=\frac{1}{Z}\int_0^Zh(u)\mathrm{du}$.   I know that $Z$ is gamma-distributed with shape $2$ and rate $\lambda$. Then using the joint distribution of $X$ and $Y$ I calculated the joint density of $X$ and $Z$ to be $f_{X,Z}(x,z)=\chi_{z\ge x}\lambda^2\exp(-\lambda z)$. Using this, and the formula for conditional expectation, I got $\mathbb{E}(h(X)|Z=z)=\int_0^\infty h(u)\cdot f_{X,Z}(x,z)/f_Z(z) \mathrm{du}=\int_0^Zh(u)\mathrm{du}$. I can't see why I didn't get the correct result. Also, do we need the assumption that $h$ is non-negative?  Edit: Of course, right after posting this, I find that a accidentally lost the $1/z$ along the way in the last equality. The second part of the question is still not clear to me though.


As far as I understand, gravity wells prevent hyperspace travel.   What's the in-universe explanation for how Han was able to hyperspace travel through the First Order's shields, and even land successfully, in The Force Awakens?

In Star Wars - hyperspace travel has some limitations. For one, you can't get to close to a gravitational body.  We see this in Ep IV - the Falcon must lift off on repulsorlifts and travel at sublight away from Tatooine before entering hyperspace.  I seem to recall something in the novelization about "six planetary radii" when it explained how the Death Star moved using hyperspace and sublight engines.  In the now Legends canon - this gravity limitation was the explanation for the Kessel Run being measure in parsecs (basically, how much of a corner a ship can cut past a cluster of black holes), and even used tactically by the Empire with their Interdictor cruisers.  So, in the new film, how could the Falcon fly through hyperspace to get under the Starkiller Base shields?


I'm having some trouble with directories & c++. I'm using Visual Studio 2013 on a Windows setup.     Directory : .../Files which contains some text files (f1.txt , f2.txt , f3.txt)   I need the function to go through all the files in that directory one by one.  A file is open - cout the filename //Do some stuff  close - then move to next file   I have the code to read a single file. But I have no idea how to go through all of them & display the names.  void goThroughDirectory() {     while("there are remaining files , do something , then go to next one")     {          cout << "The Name of the File Currently being processed" << endl;          // While inside a file         ifstream FileX("FileName.txt");          int lineNum = 0;         string s;          while (!FileX.eof())         {             getline(FileX, s);              if (s.size() != 0)             {                 lineNum++;                 cout << s << endl;             }          }      }  }   the expected output should be :  // file name f1    // contents a b c  // file name f2   // contents a b c  .......

How do you iterate through every file/directory recursively in standard C++?


I need some help with the following problem:     Show that for any pair $(a,b)$ of positive integers, $\dfrac{a+2b}{a+b} < \sqrt{2} < \dfrac{a}{b}$.   I tried squaring both sides of the inequality, but I was not able to solve it.

Let $a$ and $b$ be positive integers. Show that $\sqrt{2}$ always lies between $\dfrac{a}{b}$ and $\dfrac{a+2b}{a+b}$.  Please give the easy solution as possible.


Let's think we have a list like this int[] values = {1, 2, 3, 4, 5};  I want to delete an element of values by index. I mean, the programme will ask an index, if the input is 3, values' 4th index will be deleted. I can't use ArrayLists 'cuz I'm writting a programme with 300 lines, and I don't want to convert all that Lists to ArrayList.

I have an array of Foo objects. How do I remove the second element of the array?  I need something similar to RemoveAt() but for a regular array.


In my VF page I show both save and edit button. I would like to use only one button for both edit and save. The button label should switch between save and edit depending upon the situation. That means when I am editing the page the button should show "save" and when I the VF page is saved it should show button as "edit". How can I do that?  <apex:page standardController="Interview__c" extensions="SkillReviewExtension" showHeader="false">    <apex:form >        <apex:pageBlock title="Candidate Skill Evaluation" id="skills_list">  <apex:pageBlockButtons location="top"> <apex:commandButton value="Save" action="{!save}"/> <apex:commandButton value="Edit" action="{!Edit}"/> </apex:pageBlockButtons>          <apex:pageBlockTable value="{! SkillReview }" var="ct" >         <apex:column value="{! ct.Skill__c}"/>        <apex:column headerValue="Level">          <apex:selectList value="{!Level1}" multiselect="false" size="1" rendered="{!isEditMode}">                 <apex:selectOption itemValue="1" itemLabel="1"/>                 <apex:selectOption itemValue="2" itemLabel="2"/>                 <apex:selectOption itemValue="3" itemLabel="3"/>                  <apex:selectOption itemValue="4" itemLabel="4"/>                  <apex:selectOption itemValue="5" itemLabel="5"/>             </apex:selectList>              <apex:outputText value="{!Level1}"/>        </apex:column>         <apex:column headerValue="Description"/>        <apex:column headerValue="Comments">        <apex:inputTextarea value="{!inputValue}" id="theTextInput" rendered="{!isEditMode}"/>        <apex:outputText value="{!inputValue}" />         </apex:column>         </apex:pageBlockTable>    </apex:pageBlock>       </apex:form>   </apex:page>

I have a visual force page as below:  <apex:page standardController="Interview__c" extensions="SkillReviewExtension">    <apex:form >        <apex:pageBlock title="Candidate Skill Evaluation" id="skills_list">  <apex:pageBlockButtons location="top"> <apex:commandButton value="Save" action="{!save}"/> <apex:commandButton value="Edit" action="{!Edit}"/> </apex:pageBlockButtons>          <apex:pageBlockTable value="{! SkillReview }" var="ct" >         <apex:column value="{! ct.Skill__c}"/>        <apex:column headerValue="Level">          <apex:selectList value="{!Level1}" multiselect="false" size="1" rendered="{!isEditMode}">                 <apex:selectOption itemValue="1" itemLabel="1"/>                 <apex:selectOption itemValue="2" itemLabel="2"/>                 <apex:selectOption itemValue="3" itemLabel="3"/>                  <apex:selectOption itemValue="4" itemLabel="4"/>                  <apex:selectOption itemValue="5" itemLabel="5"/>             </apex:selectList>              <apex:outputText value="{!Level1}" label="You have selected:"/>        </apex:column>         <apex:column headerValue="Description"/>        <apex:column headerValue="Comments">        <apex:inputTextarea value="{!inputValue}" id="theTextInput" />         </apex:column>         </apex:pageBlockTable>    </apex:pageBlock>       </apex:form>   </apex:page>   I have a controller extension as below:  public class SkillReviewExtension{      private final Interview__c review;     private boolean isEditMode;  public String Level1{get;set;}   public SkillReviewExtension(ApexPages.StandardController stdController) {         this.review= (Interview__c)stdController.getRecord();      }      public List<Skill_Review__c> getSkillReview() {          List<Skill_Review__c> results = [SELECT Id,Name,Skill__c FROM Skill_Review__c where Interview__c =:review.id];          return results;      }           public List<SelectOption> getCountriesOptions() {         List<SelectOption> countryOptions = new List<SelectOption>();         countryOptions.add(new SelectOption('','-None-'));         countryOptions.add(new SelectOption('1','1'));         countryOptions.add(new SelectOption('2','2'));         countryOptions.add(new SelectOption('3','3'));         countryOptions.add(new SelectOption('4','4'));         countryOptions.add(new SelectOption('5','5'));          return countryOptions;     }      public String inputValue {get; set;}      public PageReference save(){         isEditMode=false;         return null;     }      public PageReference edit(){         isEditMode=true;         return null;     }      }   I am trying to access the varibale named isEdit in my Visualforce page from controller. I can't do this by get and set method. How can the isEditMode variable can be accessed in rendered="isEditMode".


Let's say I've got a creature who has a shield in one hand and their focus in another. They also have the war caster feat  They'd like to cast a spell requiring a Material component with cost/that will be consumed and a somatic component.  What does the caster need to do in order to successfully cast this spell?  The way I've always understood if its a spell that needs a costly material/material consumed then you would have to drop something in order to give you a free hand to access the materials.   To give more clarity for this issue, here is a specific example. I have a high level wizard at my table, who has taken the war caster feat, they also have proficiency with shields. In one hand they wield a shield, in the other they carry their arcane focus of a wand. They cast the 6th level spell, Circle of Death which has the following Components: V, S, M (the powder of a crushed black pearl worth at least 500 gp). At the table I allowed the cast to go through as the wizard had previously obtained the crushed black pearl dust of the appropriate value. My question becomes, should I have required the wizard to drop/unequipped the shield so that he could of accessed the pearl dust from his backpack/component pouch.

If there is a wizard that, by some means, has acquired proficiency in the use of shields, can said wizard use his shield in one hand and his arcane focus quarterstaff in the other and still cast somatic component spells?  Since the quarterstaff has been crafted to also be an arcane focus, and the Sage Advice Compendium states that you can provide the somatic components of spells with the same hand wielding the arcane focus, in this case an arcane focus quarterstaff, could that wizard still be able to perform somatic component spells while using a shield in the other?  I understand War Caster is the feat that allows you to cast somatic component spells even while using a shield and weapon or two weapons in each hand, but is this a simple way around those rules seeing as this "weapon" is your arcane focus? I would like to believe it is not, but I'm not fully fluent in the ways of spellcasting.


I have heard sentences like  "He don't like this ." Or "He don't know this ."  Shouldn't it be  "He doesn't like this." And "He doesn't know this."  Why with singular person we use "don't" and not "doesn't" ?

Recently I was exposed to a lot of uses of "She don't + infinitive" ( + don't), instead of "she doesn't + infinitive" ( + doesn't). I'm not sure if it is a mistake or just accepted usage sometimes.   I found it in a very famous songs such as:   "" by Bon Jovi   Also in  (in 3:04)     But she don't know you like I know you Slim, no one does   She don't know what it was like for people like us growin' up, you gotta call me man   I'll be the biggest fan you'll ever lose   Sincerely yours, Stan, P.S. we should be together too   You can find a lot more by searching in you tube "he don't" or "she don't".


I'm trying to recreate some "Custom NBT Data's", but I can't seem to figure out how. I'm looking for something like: Items:[0:{Slot:0b,id:"minecraft:sandstone",Count:1b,Damage:0s}]  Is there a way to access this in Bedrock edition?

This question was recently split into different questions for each workaround. See   meta posts for more information.   Can you use NBT tags in commands? I’ve tried commands that normally work in Java Edition like: give @s minecraft:planks 30 1 {display:{Lore:["Wooden planks"]}} give @s stone_pickaxe{Unbreakable:1b} give @s item_frame{EntityTag:{Invisible:1b}} summon villager ~ ~ ~ {Offers:{Recipes:[{buy:{id:"emerald",Count:5b},sell:{id:"diamond_sword"}}]}} summon tnt ~ ~ ~ {Fuse:20s}


i would to ask that question: why freeze my ubuntu studio when system starting ? anyway ubuntu studio is great i love it only then freeze, and I dont know why ? EDIT from comments (paraphrased): I see only ubuntu logo rotate... and after 20 min still nothing (no boot?)

All operating systems freeze sometimes, and Ubuntu is no exception. What should I do to regain control when...   just one program stops responding? nothing at all responds to mouse clicks or key presses? the mouse stops moving entirely? I have an    In what order should I try various solutions before deciding to pull the power plug?  What should I do when starting up Ubuntu fails?  Is there a diagnostic procedure I can follow?


When I boot my Virtual Machine in Oracle Virtualbox it freezes. I am unable to move the mouse, audio begins looping.  I will include my system log to see if anyone can make sense of this. Even pointing in the right direction would be appreciated.   (literally was working yesterday. and now absolutely nothing.)  Jan 11 09:00:40 thispc org.debian.apt[851]: 09:00:40 AptDaemon.Worker [INFO]: Updating cache Jan 11 09:00:47 thispc AptDaemon.Worker: INFO: Finished transaction /org/debian/apt/transaction/7241eeffd78442b199b06c20d1071535 Jan 11 09:00:47 thispc org.debian.apt[851]: 09:00:47 AptDaemon.Worker [INFO]: Finished transaction /org/debian/apt/transaction/7241eeffd78442b199b06c20d1071535 Jan 11 09:01:23 thispc systemd[1]: Stopping User Manager for UID 108... Jan 11 09:01:23 thispc systemd[1088]: Reached target Shutdown. Jan 11 09:01:23 thispc systemd[1088]: Stopped target Default. Jan 11 09:01:23 thispc systemd[1088]: Stopped target Basic System. Jan 11 09:01:23 thispc systemd[1088]: Stopped target Timers. Jan 11 09:01:23 thispc systemd[1088]: Stopped target Paths. Jan 11 09:01:23 thispc systemd[1088]: Starting Exit the Session... Jan 11 09:01:23 thispc systemd[1088]: Stopped target Sockets. Jan 11 09:01:23 thispc systemd[1088]: Received SIGRTMIN+24 from PID 3387 (kill). Jan 11 09:01:23 thispc systemd[1]: Stopped User Manager for UID 108. Jan 11 09:01:23 thispc systemd[1]: Removed slice User Slice of lightdm. Jan 11 09:03:37 thispc rsyslogd: [origin software="rsyslogd" swVersion="8.16.0" x-pid="868" x-info="http://www.rsyslog.com"] start Jan 11 09:03:37 thispc rsyslogd-2222: command 'KLogPermitNonKernelFacility' is currently not permitted - did you already set it via a RainerScript command (v6+ config)? [v8.16.0 try http://www.rsyslog.com/e/2222 ] Jan 11 09:03:37 thispc rsyslogd: rsyslogd's groupid changed to 108 Jan 11 09:03:37 thispc rsyslogd: rsyslogd's userid changed to 104 Jan 11 09:03:37 thispc systemd-modules-load[259]: Inserted module 'lp' Jan 11 09:03:37 thispc systemd-modules-load[259]: Inserted module 'ppdev' Jan 11 09:03:37 thispc systemd-modules-load[259]: Inserted module 'parport_pc' Jan 11 09:03:37 thispc rsyslogd-2039: Could not open output pipe '/dev/xconsole':: No such file or directory [v8.16.0 try http://www.rsyslog.com/e/2039 ] Jan 11 09:03:37 thispc loadkeys[258]: Loading /etc/console-setup/cached.kmap.gz Jan 11 09:03:37 thispc systemd[1]: Started Set console keymap.

Ubuntu 16.04 LTS Virtualbox 5.0.40 ubuntu r 115130  Today after upgrading to kernel 4.13.0-26 guest vbox machines started to crash whole ubuntu. just hard poweroff is working.  If I startup with kernel 4.10.0-42 everything works fine.  what may be the problem ?


There are unnecessary lines around /Host:*keep-alive/ block, how to remove other lines. only leave two blocks of /Host:*keep-alive/, PS. the dummy lines are the different block of lines. dummy lines ------------------------------- Host: www.google.ca User-Agent: Links (2.20.2; Linux 5.8.0-1010-raspi aarch64; GNU C 9.2.1; text) Accept: */* Accept-Language: en,*;q=0.1 Accept-Encoding: gzip, deflate, br, zstd, bzip2, lzma, lzma2, lzip Accept-Charset: us-ascii,ISO-8859-1,ISO-8859-2,ISO-8859-3,ISO-8859-4,ISO-8859-5,ISO-8859-6,ISO-8859-7,ISO-8859-8,ISO-8859-9,ISO> Connection: keep-alive dummy lines---------------------------------- Host: www.bing.com User-Agent: Links (2.20.2; Linux 5.8.0-1010-raspi aarch64; GNU C 9.2.1; text) Referer: http://www.bing.com/ Accept: */* Accept-Language: en,*;q=0.1 Accept-Encoding: gzip, deflate, br, zstd, bzip2, lzma, lzma2, lzip Accept-Charset: us-ascii,ISO-8859-1,ISO-8859-2,ISO-8859-3,ISO-8859-4,ISO-8859-5,ISO-8859-6,ISO-8859-7,ISO-8859-8,ISO-8859-9,ISOȩ Connection: keep-alive dummy lines----------------------------------

I want to get text in between START & STOP. Remaining text should be deleted, like some_text_1 and some_text_2.  some_text_1 some_text_1 . . . START --- Values that I want to get ... STOP some_text_2 some_text_2   From my findings, sed does similar job, but only oposite, like: sed '/START/,/STOP/d' file which would give me everything else then content in between START & STOP.  Any idea?


Let $f$ be a non-constant entire function such that $f'(z)≠ 0$. Then $f$ is locally univalent.

I am trying to solve the following problem:     Let $f:U\to V$ be a holomorphic function such that $f'(z)\neq 0$ for all $z\in U$. Show that for all $z_0\in U$, there exists a disc $D_\varepsilon(z_0)\subseteq U$ such that $f:D_\varepsilon(z_0)\to f(D_\varepsilon(z_0))$ is bijective.   Atempt:  I am trying to use Rouche's Theorem, but I am stuck on a particular step. Let $z_0\in U$. Since $f'(z_0)\neq 0$, there is a disc $D_r(z_0)\subseteq U$ such that $$f(z)=f(z_0)+(z-z_0)h(z),\quad\forall z\in D_r(z_0)$$ where $h$ is holomorphic on $D_r(z_0)$ and $h(z)\neq 0$ for all $z\in D_r(z_0)$.   Let $0<\varepsilon<r$ to be defined later and fix $w\in D_\varepsilon(z_0)$. To show that $f$ is injective in $D_\varepsilon(z_0)$ is to show that the function $f(z)-f(w)$ has exactly one zero in $D_\varepsilon(z_0)$. But $$F(z):=(z-z_0)h(z)$$ has exactly one zero in $D_\varepsilon(z_0)$, so we might want to apply Rouche's Theorem with $F$ and $$G(z):=f(z)-f(w)-(z-z_0)h(z)=f(z_0)-f(w)=-(w-z_0)h(w)$$ to conclude that $F$ and $F+G$ have the same number of zeros and hence $f$ is injective. But that means that we need to find $0<\varepsilon<r$ such that $|G(z)|<|F(z)|$ on $\partial D_\varepsilon(z_0)$. That is, $$|w-z_0||h(w)|<|z-z_0||h(z)|$$ for all $w\in D_\varepsilon(z_0)$ and $z\in\partial D_\varepsilon(z_0)$.  Can we find such $\varepsilon>0$?  It seems intuitive since if we expand $h$ in a power series at $z_0$, $h(z)=\sum_{n=0}^\infty a_n(z-z_0)^n$, then $$|w-z_0||h(w)| = |w-z_0|\sum_{n=0}^\infty a_n|w-z_0|^n < |z-z_0|\sum_{n=0}^\infty a_n|z-z_0|^n.$$ for $w\in D_\varepsilon(z_0)$ and $z\in\partial D_\varepsilon(z_0)$. But this is of course not a proof.


What is the difference between these two sentences:     Tom was hiding in the barn.      Tom was hiding in a barn.

I can’t for the life of me figure out where to use a and where to use the — and where there is no article at all. Is there a simple rule of thumb to memorize?   The standard rule you always hear:     “If a person knows which item you are talking about then use "the"   . . . doesn’t clear things up for me, as I have no idea whether or not they know.


i recently added an sb700 to my d3200 and am unsure how to determine proper amount of power to use in photos.  in another thread here on stack exchange, it was suggested that the ttl metering makes a distinction between two main situations 1) where the speedlight is being used as the main light source, and in which case shutter speed is irrelevant. 2) where the speedlight is being used as fill flash, and shutter speed is relevent.  i shoot in manual mode without the flash and would also like to shoot manual on the flash, so i am unsure if i should just be trying and erroring?  should i meter my scene underexposed and than try to balance with the speedlight, and checking for accuracy of this with my histogram?  or is there a more precise way of determining how much flash to use?

I recently got an old Canon AE-1 film camera back in working order. I'd like to use my modern 430EXII Speedlight flash with it, however since there is no TTL metering, I have no idea how much the flash will affect the exposure of my shot (note that I have confirmed that the AE-1 will trigger the flash). I'd rather not discover that my shots were either blown out or way to dark after going through several rolls of film.  Are there any basic rules-of-thumb or basic calculations for anticipating how much a burst from the 430EXII will affect the exposure of a subject at various distances?


I'm working on a data set and linear regression is beating a randomforest (the metric is weighted mean absolute error - I have a list of weights and each difference $|\text{predicted} - \text{actual}|$ is multiplied by that rows weight (which is a $\sqrt{\text{time}}$ so longer time between observations are charged a higher penalty)).    I find this a bit surprising in light of past experience.    I was curious if there are types of data that this would typically happen with AND if there are any types of algo/ml technique that's even better than linear regression.

Hi I'm studying regression techniques.  My data has 15 features and 60 million examples (regression task).  When I tried many known regression techniques (gradient boosted tree, Decision tree regression, AdaBoostRegressor etc) linear regression performed great.   Scored almost best among those algorithms.  What can be the reason for this? Because my data has so many examples so DT based method can fit well.   regularized linear regression ridge, lasso performed worse   Can anyone tell me about other performing-well regression algorithms?   Is Factorization Machine and Support vector regression good regression technique to try?


I'm very confused as to why the degree of any chromatic polynomial of a simple graph $G$ that has $n$ vertices is $n$. I've tried using strong induction on the number of edges, but I end up getting something absurd.   Let $n$ be the number of vertices and $m$ be the number of edges. Consider a simple graph with n vertices and no edges. Then clearly the chromatic polynomial $P_G(x) = x^n$.  Now suppose that $G$ has at least one edge and let $e$ be an edge of $G$. Then by the Deletion-Contraction Theorem, $P_G(x) = P_{G-e}(x) - P_{Ge}(x)$. But both graphs $G-e$ and $Ge$ has fewer edges than $G$ itself, so by the inductive hypothesis, these two graphs with fewer edges have a chromatic polynomial of degree $n$.   The part that confuses me the most is that in general, $$\deg(f(x) - g(x)) ≤ \max\{\deg(f(x)), \deg(g(x))\}.$$ In this case, the degree of $P_G(x)$ is less than or equal to $n$. So what if you get chromatic polynomials for those two graphs with fewer edges both whose coefficients of $x^n$ is just simply equal to one? Then $x^n$ cancels out in the chromatic polynomial of the graph $G$ itself, which contradicts the fact that the degree of the chromatic polynomial of any simple graph with n vertices is $n$.  Can anybody point out to me what I'm doing wrong? Thank you in advance.

I have some properties which I do not understand how to form a proof for. Most of them are by induction, which is not my strong point Any help would be fantastic.   Looking at the chromatic polynomial $$P_G(k)=P_{G-e}(k) - P_{G/e}(k)$$  Properties   1.If G has n  vertices then $ P_g(k)$ has degree n and the coefficient of $k^n $ is 1   The signs of $P_g(k) $ alternate If G has q components the smalles non-zero term of $P_g(k)$ is the term in $k^q$


How do I prevent windows from another workspace showing an icon in the taskbar (Ubuntu Dock)?  Example:    Firefox running on workspace 1 Files running on workspace 2 When I am in workspace 1 I would like to have only Firefox shown in the taskbar. When I switch to workspace 2 I would no longer see Firefox in the taskbar but instead I would see Files   This is configurable in other desktop systems such as LDXE but I cannot find the options in a standard Ubuntu 20.04 installation (running GNOME).

I would like my Dock to show only the windows of the current workspace. Especially in the little preview window. I find it very confusing to jump around workspaces when trying to find the right window.


I'm trying to activate a specific tab in the tool shelf from a script.  The idea being that my add-on would setup an "enhanced/tailored" environment for the user when certain button is clicked.  Is that possible?  Also, following this idea, in the "Tools" tab of the tool shelf, there are many sections (i.e. Transform, Mesh Tools, Weight Tools...). Is is possible to collapse/expand those sections from a script?

How can I detect and/or change the active tab in the current editor via Python?   Is this doable? I have been digging through bpy.context.region/screen and not yet found a way to list the active tab.


On the seventh episode of Last Week Tonight John Oliver . Here's part of the exchange:     Artificial intelligence could be a real danger in the not-too-distant future. It could design improvements to itself and out-smart us all.      I know you're trying to get people to be cautious there, but why should I not be excited about fighting a robot?       You would lose.       Okay, for a start we don't know that. We don't know that for sure. 'Cause what could a robot do that I couldn't then fight back by simply unplugging him?       There's a story that scientists built an intelligent computer.   The first question they asked it was: "Is there a God?" The computer   replies: "There is now." And a bolt of lightning struck the plug so it   couldn't be turned off.   The story he referenced immediately struck me as familiar. I believe other story components include that the AI was built in an isolated, possibly mountaineous, location and that it killed all but one of the scientists present when it achieved singularity. It managed this by somehow generating energy bursts which prevented its shut-down.

I can't remember the title or author in which a new super computer is built and it answers the question...     Is there a god?   (omninously) with      There is now.


If the force of gravity can be thought of as masses leaving dents on a sheet of spacetime, what is holding up that sheet?

I understand that people explain (in layman's terms at least) that the presence of mass "warps" space-time geometry, and this causes gravity. I have also of course heard the analogy of a blanket or trampoline bending under an object, which causes other objects to come together, but I always thought this was a hopelessly circular explanation because the blanket only bends because of "real" gravity pulling the object down and then pulling the other objects down the sloped blanket. In other words, to me, it seems that curved space wouldn't have any actual effect on objects unless there's already another force present.   So how is curved space-time itself actually capable of exerting a force (without some source of a fourth-dimensional force)?  I apologize for my ignorance in advance, and a purely mathematical explanation will probably go over my head, but if it's required I'll do my best to understand.


I'm interested in the difference between the following two camera kits:   Canon EOS Rebel T3i SLR Camera with EF-S 18-55 IS II lens and EF-S 55-250 f/4-5.6 IS zoom lens Canon EOS Rebel T3i SLR Camera with EF-S 18-55 IS II lens and EF 75-300 f/4-5.6 III zoom lens   I need a camera for sports pictures with the best zoom capabilities from far away.

I am getting a deal on a Canon T3 cam with 18-55mm kit lens and I have choice of one extra lens: 75-300mm f4-5.6 and 55-250mm f4-5.6. I generally like to shoot street, abstract and nature photos and I'm not sure which lens is going to be more suitable to my needs. Are their pros and cons to either lenses given my preferred subjects?


I'm trying to create a simulation for a party. There will be 4 classes: host, engineer, artist and scientist. Each one of those will have to be placed on a 50x50 field. I have to create a random generator in order to do this and I'm really stuck on this part for many hours now since I've never done random generators before so I hope that I can get some help. (I'm a beginner, yes.) I'm currently receiving this error: "Exception in thread "main" java.lang.NullPointerException     at Simulator.populate(Simulator.java:88)     at Simulator.partyStatus(Simulator.java:101)     at Simulator.(Simulator.java:56)     at Simulator.main(Simulator.java:41) BUILD SUCCESSFUL (total time: 3 seconds)"  If there is a different, better way of doing it then I'd be more than happy to see it and if you need any more details regarding this then just ask.  Thanks in advance!  public class Simulator {      private static double ARTIST_CREATION_PROBABILITY = 0.2;     private static double HOST_CREATION_PROBABILITY = 0.2;     private static double ENGINEER_CREATION_PROBABILITY = 0.2;     private static double SCIENTIST_CREATION_PROBABILITY = 0.2;      private static int seed;      private ArrayList<Artist> artists;     private ArrayList<Scientist> scientists;     private ArrayList<Engineer> engineers;     private ArrayList<Host> hosts;     private ArrayList<People> people;      private int depth;     private int width;     private Field field; //    private static int step;     private SimulatorView simView;      Random rand = RandomGenerator.getRandom();       public static void main(String [] args) { //     SimulatorView simView = new SimulatorView(50,50);       Simulator simulator = new Simulator(50,50);       }      /**      *      * @param depth      * @param width      */     public Simulator(int depth, int width) {         this.simView = new SimulatorView(depth, width);         this.field = new Field(depth, width);         this.depth = depth;         this.width = width;         this.partyStatus(simView, field);          RandomGenerator.initialiseWithSeed(seed);     }         public void populate(Field field){ //        People host = new Host(); //        People artist = new Artist(); //        People scientist = new Scientist(); //        People engineer = new Engineer();  //        field.place(artist, 10, 10); //        field.place(scientist, 20, 20); //        field.place(engineer, 30, 30); //        field.place(host,40,40);                 Random rand = RandomGenerator.getRandom();         field.clear();           for(int row = 0; row<field.getDepth(); row++){             for(int col = 0; col<field.getWidth(); col++){                if(rand.nextDouble() < ARTIST_CREATION_PROBABILITY){                  Artist artist = new Artist();                  artists.add(artist);                  field.place(artist, row, col);                }                else if(rand.nextDouble() < SCIENTIST_CREATION_PROBABILITY){                  Scientist scientist = new Scientist();                  scientists.add(scientist);                  field.place(scientist, row, col);                }                else if(rand.nextDouble() < ENGINEER_CREATION_PROBABILITY){                  Engineer engineer = new Engineer();                   engineers.add(engineer);                  field.place(engineer, row, col);                }                else if(rand.nextDouble() < HOST_CREATION_PROBABILITY){                  Host host = new Host();                  hosts.add(host);                  field.place(host, row, col);                }              }          }             }      public void partyStatus(SimulatorView simView, Field field){         this.populate(field);         simView.setColor(Artist.class, Color.ORANGE);         simView.setColor(Scientist.class, Color.BLUE);         simView.setColor(Engineer.class, Color.MAGENTA);         simView.setColor(Host.class, Color.GREEN);         simView.showStatus(1, field);     }       }

What are Null Pointer Exceptions (java.lang.NullPointerException) and what causes them?  What methods/tools can be used to determine the cause so that you stop the exception from causing the program to terminate prematurely?


Below is my code to retrieve my org's limits. However, access token refreshes every now and then. How can I get my own org's limits programmatically without using HttpRequest to avoid access token?  HttpRequest req = new HttpRequest(); req.setMethod('GET'); req.setEndpoint(Url.getSalesforceBaseUrl().toExternalForm()+'/services/data/v43.0/limits'); req.setHeader('Authorization','Bearer ' + UserInfo.getSessionId());   But, I get the error:     Session expired or invalid","errorCode":"INVALID_SESSION_ID   So I wanted to find another way to retrieve my org's limits.

Here's the scenario.  I have a remote application which is invoked from an HTTP callout.  In this callout, I am passing the session ID.  The application can then do its stuff without needing a username and password.  However, I want to be able to invoke the application from a scheduled job, and getsessionid() returns null in this case.  Is there any way around this?  I am trying very hard to avoid storing sfdc usernames and passwords on my remote server, and I want to avoid the hassle of using oAuth with all the complications of client secrets, etc.


I understand that (+) can be used to represent an outer join in oracle sql. What does the (+) in this code mean?   where sysdate between start_date(+) and end_date(+)

Found the following in an Oracle-based application that we're migrating (generalized):  SELECT     Table1.Category1,     Table1.Category2,     count(*) as Total,     count(Tab2.Stat) AS Stat FROM Table1, Table2 WHERE (Table1.PrimaryKey = Table2.ForeignKey(+)) GROUP BY Table1.Category1, Table1.Category2   What does (+) do in a WHERE clause? I've never seen it used like that before.


Does anyone know what's this icon to the left of battery status in the menu bar? It looks like binoculars.  This appears only on lock screen, and disappears as soon as I login (either through TouchID or entering the password). Clicking on that while the screen is locked doesn't help. If it helps, this is a MacBook Pro with TouchBar (2017 model) and is running macOS Catalina 10.15.6. I've been using this laptop for more than 2 years but this started appearing only 3-4 days ago. Thanks

On the lock screen in the top right corner of my Mac, there is a strange icon that disappears when I enter my password and log in. It would be great if somebody could tell me what that icon is, because it is making me start to worry. It is the icon in the left of this screenshot - like a pair of binoculars.


Here is what I got, but when I run the program the image won't show up, the only thing that shows up when I click run is a empty Jpanel. Can Someone please tell me another way of importing image in java or just help me edit my code so that my program works. (P.S the image I am trying to import is a jpg type image) Thanks.    import java.awt.* import java.awt.event.*; import java.awt.image.*; import java.io.*; import javax.imageio.*; import javax.swing.*; public class LoadImageApp extends Component {  BufferedImage img;  public void paint(Graphics g) {     g.drawImage(img, 0, 0, null); }  public LoadImageApp() {    try {        img = ImageIO.read(new File("example.jpg"));    } catch (IOException e) {    }  }  public Dimension getPreferredSize() {     if (img == null) {          return new Dimension(600,600);     } else {        return new Dimension(img.getWidth(null), img.getHeight(null));    } }  public static void main(String[] args) {      JFrame f = new JFrame("Load Image Sample");      f.addWindowListener(new WindowAdapter(){             public void windowClosing(WindowEvent e) {                 System.exit(0);             }         });      f.add(new LoadImageApp());     f.pack();     f.setVisible(true); } }

I have a  to which I'd like to add JPEG and PNG images that I generate on the fly.  All the examples I've seen so far in the , specially in the  use ImageIcons.  I'm generating these images as byte arrays, and they are usually larger than the common icon they use in the examples, at 640x480.   Is there any (performance or other) problem in using the ImageIcon class to display an image that size in a JPanel? What's the usual way of doing it? How to add an image to a JPanel without using the ImageIcon class?   Edit: A more careful examination of the tutorials and the API shows that you cannot add an ImageIcon directly to a JPanel. Instead, they achieve the same effect by setting the image as an icon of a JLabel. This just doesn't feel right...


I was looking at at puddle when I thought that this puddle will evaporate tomorrow but then it occurred to me that the boiling temperature of water (aka to turn into gas) is $100$ degrees under 1 atmospheric pressure of earth. Then I thought the temperature around me was 25 degrees which is way away from temperature of boiling therefore it should in theory or at least in my perspective never evaporate the water, yet nature disagrees and does this so.   Therefore I proposed an hypothesis (Still in Middle School so please excuse me) the water turns into gas as a result of the photons "hitting" the atoms and transferring its energy into the water atoms which in turn moves the atoms giving it $KE$ (Kinetic Energy) and this happens over a millions of times which results in water particles gaining this energy and therefore evaporating without substantial notice or feel of it bubbling or showing any sign of it as this happens very slowly.   However I as a middle school student am not too considerate or confident on my hypothesis so would you say my hypothesis is correct or wrong and can you explain why this happens?

When the sun is out after a rain, I can see what appears to be steam rising off a wooden bridge nearby. I'm pretty sure this is water turning into a gas.  However, I thought water had to reach 100 degrees C to be able to turn into a gas.  Is there an edge case, for small amounts of water perhaps, that allows it to evaporate?


As stated in the title, we get the error Minecraft: java.net.connectexception whenever we try to connect to each other's LAN worlds. We have tried several fixes including:   Using Hamachi Turning off our firewalls Creating new inbound rules for Minecraft Installing a different version of Minecraft   Nothing so far has worked. We can connect to other servers just fine, but can never join each other's LAN worlds.  Any suggestions or fixes, would be greatly appreciated.  Thank you in advance you wonderful person <3.

I am getting the following error when I try to connect to a Minecraft server:  This is all servers, not just one. The error says:  io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: no further information: Version 1.12  I've tried:  Restarting Minecraft Restarting Computer Uninstalling and Reinstalling Mincraft Uninstalling and Reinstalling Java Altering Firewall Restarting Internet I've messed with my port, made a second windows account, reset netsh winsock Checked hosts Made a new WINDOWS account  The overlay in the bottom right is Geforce's Overlay for game capturing. I don't have any mods installed. A Mojang support ticket wouldn't help. Im desperate.


Let $f$ be continuous such that $$\lim _{x\to \infty }\left(f\left(x+1\right)-f\left(x\right)\right)=0$$ show that $$\lim _{x\to \infty }\left(\frac{f\left(x\right)}{x}\right)=0$$  My idea was applying the sequential criterion for continuity: that if $f$ is continuous at $c$ if and only if for every sequence $x_n$ that converges to $c$, $f(x)$ converges to $f(c)$.  Also, I have the idea that since $$\lim_{x\to \infty }\left(f\left(x\right)\right)=\lim_{x\to\infty}\left(f\left(x+1\right)\right),$$ I can use it somehow in the demonstration, or am I wrong?

Using my right to ask for help once again. I can't solve the following problem for quite a long time. Just have no idea how to do that. Here it is. Let $f(x)$ be bounded on any interval $(1,b), b>1$. Then $\lim_{x\to+\infty}{f(x) \over x}=\lim_{x\to+\infty}(f(x+1)-f(x))$. It is from the Russian book "Lekcii po matematicheskomu analizu" by G.I.Arkhipov, V.A.Sadovnichy and V.N.Chubarikov, 2nd ed., Moscow, 2000, page 676. Please, keep in mind, that times, when I did homework had passed long time ago. Now I'm solving problems for pleasure.


Following is sample html code, Similar code i have in String variable and i need to read each values of only "select" and add it to some collection. Thanks in advance.  `   <head>  <title> Sample HTML </title>  </head>  <body>  <form id="form1" runat="server">    <h3> Sample Example </h3>    <p>Select items from the list<p>     <select id="Select1" runat="server">      <option value="Text for Item 1" selected="selected"> Item 1 </option>      <option value="Text for Item 2">Item 2</option>      <option value="Text for Item 3">Item 3</option>      <option value="Text for Item 4">Item 4</option>      <option value="Text for Item 5">Item 5</option>      <option value="Text for Item 6">Item 6</option>   </select>     </form>  </body>  </html>`

I'm looking for a library/method to parse an html file with more html specific features than generic xml parsing libraries.


In what situations you can use a high iso value and a short shutter time, or use a low iso value and a long shutter time? What will be the difference between two pictures of exactly the same scene, when you take one picture with a high iso value and a short shutter time and another picture with a low iso value and a long shutter time?

My understanding of the ISO setting on digital cameras is that, unlike film-cameras, changing the ISO does not evoke any physical change in the camera.  Rather, it simply tells the camera to multiply the analog-voltages it reads from the sensors by a constant number, which increases the brightness of that pixel in the output JPEG image.  And since the RAW files store the actual voltages read, before any changes to the brightness take place, the values in the RAW file will be the same regardless of the ISO setting.  Thus, if you're snapping pictures in RAW format only, the ISO setting does absolutely nothing (Also it would mean digital cameras with higher ISOs are completely a marketing gimmick).  However,  contradicts that.  It shows the following image:  which claims that the ISO setting does affect the RAW output! †  It also states "to minimise noise get as much light into the camera as possible then use the highest ISO you can without overexposing."  If my understanding is correct, all images with the same shutter-speed will result in the same (RAW) image, regardless of ISO setting.  However, if the explanation in the above post is correct, (RAW) images that were taken with an incorrectly-exposed ISO setting can't be corrected in software without introducing extra noise.  (I found  online in which several 'experts' argue back and forth about which understanding is correct, but never reach a conclusion)    To figure out which understanding is correct, I tried shooting an image at various ISOs and shutter-speeds, in RAW+JPEG mode.  I then loaded the RAW files into Photoshop and applied auto-correct within "Camera Raw" (before the JPEG conversion).    These were the results (click to enlarge):   (All shots taken with Sony a390 DSLR.  Aperture f/5.6, 18-55mm zoom lens set to 55mm)  And for comparison, here were the JPEGs created for those same shots by the camera (no Photoshop correction applied):    It appears we're both wrong (What!?!??!!?).  The ISO setting definitely did have a major difference in the final RAW image, but it seems that even when it causes under-exposure, using the lowest ISO setting still resulted in the least amount of noise!!  I assume that, to understand why that is, I need to know exactly how the ISO setting works in DLSRs - could someone please explain that to me?  Is the sensor somehow physically made more sensitive, or is it a simple digital (or possibly analog) amplification of the voltage signal?  Or does it work differently in different cameras (mine is a rather low-tier DLSR)?  If the sensor doesn't physically become more sensitive, why does the ISO setting affect the RAW image?  Why did an underexposed ISO100 image result in less noise (after photoshop correction) than the same image with the same aperture/shutter at (a correctly-exposed) ISO3200?    † (At least, I think that's what he's saying.  The post is ambiguous as to whether the auto-correction was done to the RAW or the JPEG file.  I'm just assuming it was done to the RAW, though, as doing it to the JPEG would just be stupid - he'd be amplifying the compression+quantization noise, not the camera noise, which would make the entire post incorrect)


Let $A$ be an $n\times m$  matrix. Prove that $\operatorname{rank} (A) = 1$ if and only if there exist column vectors $v \in \mathbb{R}^n$ and $w \in \mathbb{R}^m$ such that $A=vw^t$.    Progress: I'm going back and forth between using the definitions of rank: $\operatorname{rank} (A) = \dim(\operatorname{col}(A)) = \dim(\operatorname{row}(A))$ or using the rank theorem that says $ \operatorname{rank}(A)+\operatorname{nullity}(A) = m$. So in the second case I have to prove that $\operatorname{nullity}(A)=m$-1

Prove that every $m \times n$ matrix of rank $1$ has the form $A=XY^t$, where $X,Y$ are $m$- and $n$-dimensional column vectors. How uniquely determined are these vectors$?$  My attempt: I thought about using the dimension formula somehow. I know that nullity $+$ rank $=$ dim $A$. We know dim $A=mn$ but this got me nowhere. Then I tried doing an example. I took $$ A=\begin{pmatrix} 1 & 3 \\ 0 & 0 \end{pmatrix} $$  which has rank $1$. Then I can choose $$ X=\begin{pmatrix}1 \\ 0 \end{pmatrix}, Y=\begin{pmatrix} 1 \\ 3\end{pmatrix} $$ or I could choose $$ X=\begin{pmatrix} 1/2 \\ 0 \end{pmatrix}, Y=\begin{pmatrix}2 \\ 6 \end{pmatrix} $$ so that they are not uniquely determined. However, I can interchange the entries of $X$ and $Y$ to get ''different'' $X,Y$. But one the entries of $X$ (or $Y$ are chosen) then entries of $Y$ (or $X$) are then forcefully chosen. So I believe the final answer for that will be that they are not unique but choosing one vector determines both.  However, this method works for matrices $A$ with only one nonzero row and certainly many $A$'s have rank $1$ with many nonzero row. I know that $A$ has rank $1$ means I can use a series of elementary matrices to place it in the form I used above, but am unsure of how to use this since I'm not sure how to reconcile this with my ''choices'' for $X,Y$. Is there a way to do this or am I on the wrong track.  Note: I do not need nor want solutions but rather hints or thoughts on how I should proceed.


I own a HP-Laptop db1005nv with an amd Ryzen 5-3500U is it possible to change the processor?(sorry for bad english,it is not my 1st language!)

I read that this processor is BGA. That would mean that it is soldered to the motherboard? Can an average laptop technician replace it?  This processor is very slow, it scores only 600 on the Passmark CPU Benchmark.


Demo and full code is like this :   My HTML code is like this :   <button type="button">Click Me</button>

                 <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>

   My Javascript code is like this :   $(document).ready(function(){         $("button").click(function(){              $.ajax({                 //type: 'POST',                 //url: 'script.php',                 success: function(data) {                     var isitable = '';                     isitable += '
<button class="btn btn-primary tes" id="NationCd=ID&CityCd=JKT">Book 1</button>

';                     isitable += '<button class="btn btn-primary test" id="NationCd=ID&CityCd=BAI">Book 2</button>

';                     isitable += '<button class="btn btn-primary test" id="NationCd=ID&CityCd=JOG">Book 3</button>
';                      // console.log(isitable);                     $("#tes").html(isitable);                                    }             });         });          $(".test").click(function(){             console.log('tes');             var id = this.id;             console.log(id);         });     });   When click button "Click me", It will display three button. Look jsfidde.  When click the button (for example, I click button "book 1"), It will send parameter id.  I do console.log(this.id); in $(".test").click(function(){, but it's not working.   Any solution to solve my problem?  Thank you

I have a bit of code where I am looping through all the select boxes on a page and binding a .hover event to them to do a bit of twiddling with their width on mouse on/off.  This happens on page ready and works just fine.  The problem I have is that any select boxes I add via Ajax or DOM after the initial loop won't have the event bound.  I have found this plugin (), but before I add another 5k to my pages with a plugin, I want to see if anyone knows a way to do this, either with jQuery directly or by another option.


I installed Ubuntu 15.04, then I updated it and restarted. After that I can't install anything from terminal using   apt-get install [package-name]    any more. For every package it says   Unable to locate package [package-name]   It happened right after I upgraded to Ubuntu 15.04, immediately after its installation.   Is there any solution other than formatting the drive and reinstalling Ubuntu?

There are many  about Unable to locate package.  For example : if user try to install package by using apt-get then the following error shown. (Here package is used only as example for displaying error message):  sudo apt-get install package Reading package lists... Done Building dependency tree        Reading state information... Done E: Unable to locate package package   What does this error mean? How do I solve it?    provided General solution to understand and how to solve such type of error (which is helpful for new users that may unaware of repository-apt install mechanism)  Note : For resolving unmet-dependencies, visit: .


How could Emperor Palpatine afford having such a massive fleet of Star Destroyers built on Exegol? One could theorize that it was done for free by The Sith Eternal (his fan club) but there's the price of the parts they need. Is there an in-universe explanation of the origin of such immense resources?

I watched the film 'The Rise of Skywalker' in cinema. Our heroes spent most the film searching for a super secret planet. It turns out the only way to reach the planet is with the help of a extremely rare special navigation device.  When they arrive, the planet itself is uninhabited except for one lonely man. However in orbit is a huge fleet (the biggest ever seen?) of hundreds/thousands of new star destroyers, all with new super powerful weapons and crewed for combat. This is a surprise to the goodies.  How did the baddies build so many ships in secret and in isolation to the galactic economy? Did they import the raw materials? Where did the crews come from?


We have normal subgroups $ N$ and $ N'$ of a group $ G $. Is the following statement correct?  $G/N\cong G/N'\Leftrightarrow N\cong N'$.  $\Leftarrow $ is trivial.  $\Rightarrow:$ I don't know how to start. Or should I search for counter examples?  I would be pleased, if someone could give a hint.

I know it is possible for a group $G$ to have normal subgroups $H, K$, such that $H\cong K$ but $G/H\not\cong G/K$, but I couldn't think of any examples with $G$ finite. What is an illustrative example?


im new to this community but is it possible to install android 6.0 on a non-nexus phone with a universal install image  if not please tell

Are there any technical or others reasons why Android is still a firmware and not an OS which can be just installed without a lot of hassle?  Why there is no universal image which could detect appropriate drivers (kernel modules), partition NAND in some standard way and configure boot loader to boot updated OS version?  What stops Google from making a real (less firmware-like) OS (an OS for small ARM, x86 etc. devices)?


Tried to scale the bridge to be 8m wide. But when I inspect the dimensions with edge length in viewport overlays the sizes are huge in comparison to the original. Any attempt to look up this results in basic tutorials that don't have this issue.

I just found out about the Mesh Display : Length feature in the "N" panel (thanks to ) that allows one to measure the length of a face or vertice.  But my first encounter with this tool gives me complex feelings of love and hate, see how, as I was trying to measure the aspect ratio of this TV screen, I am getting WIDTH = 20.33 and HEIGHT = 37.57.  These values seem awfully wrong, since my betrusted eyes tell me the height should be shorter than the width.    I have tried measuring the single vertices as well, to identical results.


How many solutions has the equation $x_1+x_2+\cdots+x_k=n$ in non-negative integers?

The original problem is there are $r$ identical boxes and $n$ identical balls.  Every box is nonempty.  Then how many ways of putting balls in boxes?  It is equivalent to the problem of finding integer solutions for the equality: $$x_1+x_2+...+x_r= n$$ and $x_i>0$ for all $1\leq i\leq r$.  Editted by @Sil: Replaced with equality to avoid confusion that this question deals with $x_1+x_2+\dots+x_r\leq n$, which it does not!


I have a non-template class that is itself used as a template parameter of another class. This class is used to abstract the underlying representation of some data. Ideally, one of the method of this class should be integer parameterized.  E.g  :     typedef double Price;   enum Side {   BUY,   SELL };  struct Book {   template <Side side>   int getLimit(Price price) const   {     return 0;   } };  struct Spotter {   template <typename Book>   Price compute(Price startPrice, const Book& book)   {     int limit = book.getLimit<BUY>(startPrice);     return 0;   } };   Now when compiling with gcc, I get  "error: no match for 'operator<' in book->Book::getLimit < (Side)0u"  It looks like a parsing error as if the grammar does not allow object.method(args) to be written in the first place.  Note that in my real code, the compute() method is itself parameterized by a side parameter, which is forwarded to the getLimit() method.  Is there a way to make this work  ?

In templates, where and why do I have to put typename and template on dependent names? What exactly are dependent names anyway?    I have the following code:  template <typename T, typename Tail> // Tail will be a UnionNode too. struct UnionNode : public Tail {     // ...     template<typename U> struct inUnion {         // Q: where to add typename/template here?         typedef Tail::inUnion<U> dummy;      };     template< > struct inUnion<T> {     }; }; template <typename T> // For the last node Tn. struct UnionNode<T, void> {     // ...     template<typename U> struct inUnion {         char fail[ -2 + (sizeof(U)%2) ]; // Cannot be instantiated for any U     };     template< > struct inUnion<T> {     }; };   The problem I have is in the typedef Tail::inUnion<U> dummy line. I'm fairly certain that inUnion is a dependent name, and VC++ is quite right in choking on it. I also know that I should be able to add template somewhere to tell the compiler that inUnion is a template-id. But where exactly? And should it then assume that inUnion is a class template, i.e. inUnion<U> names a type and not a function?


when I restart I get a black screen then a gray screen with a 219 heading and a screen full of entries with ok after some of them and then the gnome login. also after doing a dist upgrade the id in the settings details shows that it has reverted to 14.10 but is still 15.04 i'm confused.

I've recently installed Xubuntu 15.04 on my desktop  The video playback was kinda slow and buggy so I installed the nvidia drivers (the gpu is an onboard 7025)  As some people, I get the "ACPI PPC Probe ..." message, but after 20 seconds or so, the system boots just fine, also the video playback is fine and there doesn't seem to be any graphic issues  My question is: Should I be worried about that message popping every time I boot? and what does it exactly means?  I didn't found any answers to that, just workarounds for people who can't pass the message


I have a Swedish Windows 10 computer and I made it to have 3 keyboards: Swedish, American English and French. But in the keyboard list, there is a fourth language, Swedish English, as you can see in the screenshot:    I went into language settings (by clicking on the språkinställningar button in the screenshot) and I could only see the three languages that I want: Swedish, American English and French. I clicked on each of these three languages and on the button Options and in each case, there was only one keyboard, the one for the language. To make this more clear, here is a screenshot of the options for American English:    It's the same for all other languages except that the only keyboard in the keyboard list is Swedish for Swedish and French for French.  I also tried deleting the Swedish and English keyboards and leaving only the French one (which is the only one that has nothing to do with Swedish English) and the Swedish English keyboard is still there.  The Swedish English doesn't seem to be anywhere in the settings, but it still shows up. Why is this? How can I take it away?

After I have installed Office 2016 Home and Student (en-us version) it automatically added two new keyboard layouts - English UK and English International in addition to my existing other layouts (English US and Russian). I'm trying to get rid of these new keyboard layouts but I absolutely cannot find an option to remove them ANYWHERE - not in Control Panel, not in Settings...  I have no "languages" section in Control panel, no "choose your langauge preferences" or whatever. In the new Settings thing these new languages are not shown in the list of languages, I can't remove them!  Does anybody know how to remove these new keyboard layouts? And why did Office add them in the first place?  Screenshots of my settings:      None of these solutions worked for me:


From all the texts I've read, it's always stated that the magnetic field would either curl or warp around the the current flowing within a conductive element, yet, I never was clarified as to why that is. Why would the field "curl" around it? I'm curious if there is an explanation for that nature.    Amazingly, it seems like a perfect circle too, similar to the diagrams that I've studied.

So I learned that the bar magnet makes a magnetic field and the field lines have a certain shape which kinda resembles 2 semi-ovals.  And if we pass current through a conductor then it makes a  magnetic fields and the field lines are in the form of concentric circles around the conductor.  My question is- why? Why do magnetic field lines take the shape that they take? There must be a reason behind it. Why aren't the field lines of a normal bar magnet shaped like the field lines of a conductor carrying electricity? And vice-versa?   Please explain it to me..i know that it delves very deep into the fundamentals of the working of science but still...please tell me the reason if anyone knows it


The question is:     Let $(G, *)$ be a group and $a, b \in G$. Suppose that $a*b^3*a^{-1}=b^2$ and $b^{-1}*a^2*b=a^3$. Show that $a=b=e$.   I've tried to prove it in many ways. But, could do nothing so far. Hints are welcome rather than full answers.

Let $(G,*)$ be a group with identity $e$ , let $a,b∈G$ such that $a*b^3*a^{-1}=b^2$ and $b^{-1}*a^2*b=a^3$ , then how do we prove that $a=b=e$ ?


Hey guys I was reading Alfred van der Poortens paper regarding Apery's constant and I came across this pretty equality. For all $a_1, a_2, \ldots$  \begin{align} \large\sum_{k=1}^{\infty}\frac{a_1a_2\cdots a_{k-1}}{(x+a_1)\cdots (x+a_k)} = \frac 1x \end{align}  I tried fiddling around with the the summands by trying to use a partial fraction decomposition but it just got messy.  link to paper:

I recently printed a paper that asks to prove the "amazing" claim that for all $a_1,a_2,\dots$  $$\sum_{k=1}^\infty\frac{a_1a_2\cdots a_{k-1}}{(x+a_1)\cdots(x+a_k)}=\frac{1}{x}$$  and thus (probably) that  $$\zeta(3)=\frac{5}{2}\sum_{n=1}^\infty {2n\choose n}^{-1}\frac{(-1)^{n-1}}{n^3}$$  Since the paper gives no information on $a_n$, should it be possible to prove that the relation holds for any "context-reasonable" $a_1$? For example, letting $a_n=1$ gives  $$\sum_{k=1}^\infty\frac{1}{(x+1)^k}=\frac{1}{x}$$  which is true.  The article is


I have a date value 20130312 and I would like to convert it into a format like 2013-03-12 or a similar format  I've tried looking into the datetime library but could not find a solution.  Thanks in advance

I've got a huge list of date-times like this as strings:  Jun 1 2005  1:33PM Aug 28 1999 12:00AM   I'm going to be shoving these back into proper datetime fields in a database so I need to magic them into real datetime objects.   This is going through Django's ORM so I can't use SQL to do the conversion on insert.


I would like to write a \newcommand to define a stylish word, like \LaTeX.  Let's take this example:  \newcommand{\mystyle}{      \textit{\raisebox{+0.2ex}{M}      \kern-0.66em\raise-0.3ex\hbox{\scriptsize y}      \kern-0.3em\raise0.4ex\hbox{\scriptsize s}      \kern-0.75em\raise-0.3ex\hbox{\scriptsize t}      \kern-0.3em\hbox{yle}      }      }   The problem is, when \mystyle is put inside \title{} or \section{} the fontsizes which are defined by brute force (1st 4 letters) get too small since they do not proportionally scale with the remaining letters. If I write \LaTeX inside \title{} there is no problem.   How to get my command working smoothly like that?

For some small macros I'm writing I would need to change the font size relative to the font size of the text that surrounds to macro later on. I only know how to change the font size for the whole document (documentclass/fontspec), or for some text, but only relative to the default font size for the document (\Large, \small).  What I was thinking of was something like:  \newcommand*\mycommand{\smaller ipsum} \Large lorem \mycommand \small lorem \mycommand   If I use \Large, \small etc in the command itself, it will not care about the font size of the surrounding text but set the font size relative to the default font size. I would want it to be e.g. 1.2 times smaller than \Large or \small, depending on where it is used.


How can I output the command itself in addition to its output to a file?  I know that I can do  to capture the output. My use case is specific to pytest.  pytest /awesome_tests -k test_quick_tests -n auto &> test_output_$(date -u +"%FT%H%MZ").txt   It would be really helpful to have the command executed in the output so I knew specifically what the results were for.

Suppose I have a command java -cp src/ nlp.lm.BigramModel wsj/ 0.1, I want to save the command itself and the command execution output to the file at the same time.  One way to do this is to   echo "$ java -cp src/ nlp.lm.BigramModel atis/ 0.1" > trace/bigram-trace.txt     java -cp src/ nlp.lm.BigramModel atis/ 0.1 >> trace/bigram-trace.txt   Is there a better way to do this?


I have reviewed  and that does not equate to the specific question that I wish to ask because I'm looking for a simple answer about accuracy of multiple formulas.  While there is an answer there that discusses accuracy, it does it more as a comparison between two methods and depends on the reader understanding trigonometry to follow the answer.  I'm looking, mostly, for simple margins of error.  This is my first time trying to compute distance from two points on the ground.  I've been researching this and see that a lot of people use the Haversine Formula, but I also see comments, whenever I read about it, that there are accuracy issues.  Apparently, from what I see, Vincenty is more accurate, but I've also seen comments that the Law of Cosines is better.  What I don't see is any way to find out just how inaccurate I can expect a method to be.  Apparently there can be problems at extremely small distances in Haversine, but I'm not clear on that.  I'd like to just go on and use GeoPy in my program.  I'm basically working with distances of 100 miles or less.  Most of the time I'm comparing coordinates of two locations to see if they're close enough to be considered the same address.  If the accuracy is going to be within a few feet, that's close enough.  Can someone either point to a good resource or explain what kind of accuracy I can expect from the different methods I've mentioned and if there's a way to know what the conditions are that will give me more or less accurate answers?    I do see that GeoPy has a feature to tell me the confidence of a calculation, but I need to be able to know, in general, what kind of accuracy I can get from any one method overall, not for each individual calculation.  I see a lot about one method being better than another, but I don't see much on what kind of accuracy I can expect from any one method and what factors I can look at to tell me how accurate that method is.  That's what I'd like help finding.

In fact, when Sinnott published the   haversine formula, computational   precision was limited. Nowadays,   JavaScript (and most modern computers   & languages) use IEEE 754 64-bit   floating-point numbers, which provide   15 significant figures of precision.   With this precision, the simple   spherical law of cosines formula (cos   c = cos a cos b + sin a sin b cos C)   gives well-conditioned results down to   distances as small as around 1 metre.   In view of this it is probably worth,   in most situations, using either the   simpler law of cosines or the more   accurate ellipsoidal Vincenty formula   in preference to haversine! (bearing   in mind notes below on the limitations   in accuracy of the spherical model).   Source:    What is the reason why law of cosines is more preferable?  Note: The quoted text has been updated by  as mentioned .


Can i as individual get access to 180 evaluation period for windows server. Problem is it says it requires name of a company and company phone number

This is a  about Licensing.    Questions on licensing are off-topic on Server Fault.  If your question has been closed as a duplicate of this question, then this is because we want to help you understand why licence questions are off topic rather than just telling you "it just is". In all likelihood, this question will not address your question directly, it was not meant to.    I have a question regarding software licensing. Can the Server Fault community please help with the following:   How many licenses do I need? Is this licensing configuration valid? What CALs do I need to be properly licensed? Can I run this product in a virtual environment? Can I downgrade this product to an earlier version? Am I entitled to feature X with license Y?


For most people, they have the shortcut directories on the left and it is easy to access. After my installation, I could not find these shortcuts(Home,Desktop,Documents,Downloads,Music,etc...). This is my second installation, the first one worked fine, I could see them, but with this second installation, I can't find these shortcuts and it makes navigation a little hard  This is how my Folder directory looks like  . There are not shortcuts for easy access. Please how can I solve this?

When I open nautilus does not open the left bar where it says computer and down markers such as music, documents, videos, downloads. I reinstalled nautilus from the synaptic package manager but nothing happened. What I can do to make that bar visible again?


I stumbled upon an interesting limit of series and I was wondering how could it be solved...  $$\lim_{n\to \infty} \frac{1^p + 2^p + \ldots + n^p}{n^{p+1}} = \frac{1}{p+1}$$  I tried to divide it into smaller sections ($\frac{1^p}{n^{p+1}}$, $\frac{2^p}{n^{p+1}}$, ..., $\frac{1}{n^p}$), factoring the numerator, but nothing seemed to be the way to go...  I also tried using the squeeze theorem - finding two series with the limit of ${\frac{1}{p+1}}$ but I had no luck with this either.  Any ideas?

By considering:  $$\lim_{n\to\infty}\frac{\sum_{k=1}^n k^1}{n^{2}} = \frac 1 2$$ $$\lim_{n\to\infty}\frac{\sum_{k=1}^n k^2}{n^{3}} = \frac 1 3$$ $$\lim_{n\to\infty}\frac{\sum_{k=1}^n k^3}{n^{4}} = \frac 1 4$$  Determine if this is true: $$\lim_{n\to\infty}\frac{\sum_{k=1}^n k^m}{n^{m+1}} = \frac 1 {{m+1}}$$  If it is, prove it.  If it is not, evaluate $\lim\limits_{n\to\infty}\frac{\sum_{k=1}^n k^m}{{m+1}}$.


What is the title for someone who has multiple talents and skills? Eg, juggling, pickpocketing, memory expert, sleight of hand etc.   Thank you.

I wonder how the following words for describing someone who knows many different things compare, and when to use which word.  Some  are adjectives, others are nouns:   renaissance polymath versatile aficionado ... (possibly others if you don't hesitate to mention)   Some background:   I encountered "aficionado" and "versatile" from a personal description      "It's getting harder and harder for me to believe that you're just a   hobbyist. Aficionado would be a better term. And a damn versatile one   at that!"  When I told some American I hoped to be polymath, he said they would use "Renaissance" instead.


I couldn't find any tutorial to install  Oracle 11gR2 Enterprise Edition on Ubuntu 16.10? Please help.

Please provide me with the guidance to install oracle 11gr2 on Ubuntu 14.04.


Is it true that the Universe can not have an eternal past? It seems like Alexander Vilenkin tries to argue this? Does this imply that the Universe had a beginning?   Link to his publication regarding this question:

Does the Borde-Guth-Vilenkin theorem definitively demonstrate that the Universe cannot be past-eternal, whatsoever?  Does it not assume a classical space-time while the real world requires Quantum mechanics?  Are there successful models in Cosmology that are Past-Eternal?  Why might Alan Guth say the Universe might be eternal in the past, when he himself wrote a theorem in 2003 saying it most definitely isn't?


From every definition I have looked up, closure is when a function is created or declared from within another function. Examples are plentiful across blogs and websites of this happening.  But what about when the function is declared outside of another function, but called then called from within a function?  For example:  const add = (x,y) => {   return x + y; };  const double = num => {   return add(num,num) };  let a = double(6);/*?*/   Does add(num, num) create closure? If so, please help me understand why.

How would you explain JavaScript closures to someone with a knowledge of the concepts they consist of (for example functions, variables and the like), but does not understand closures themselves?  I have seen  given on Wikipedia, but unfortunately it did not help.


I want know wether "defnitions" are if and only if. For example if a set satsfies all four group axioms we say it is group but then we go other way also.  thank you.

In some books the word "if" is used in definitions and it is not clear if they actually mean "iff" (i.e "if and only if"). I'd like to know if in mathematical literature in general "if" in definitions means "iff".  For example I am reading "Essential topology" and the following definition is written:     In a topological space $T$, a collection $B$ of open subsets of $T$ is said   to form a basis for the topology on $T$ if every open subset of $T$ can be written as a union of sets in $B$.   Should I assume the converse in such a case? Should I assume that given a basis $B$ for a topological space, every open set can be written as a union of sets in $B$?  This is just an example, I am not asking specifically about this sentence.


I am not a person who has studied architecture or any form of engineering streams. Just one with cursory interest in decors an building techniques, old and new. The type who watches those  documentaries like 'MegaStructures'  I was looking for a place where I can ask questions about such topics. For example: "the type of glasses covering typical multistory office buildings" or "How do engineers compensate for metal expansion in large bridges?"  Can anyone direct me to the correct Stack exchange site?

Googling shows me a lot of results for software architecture. But I'm looking for the traditional one :-)


Is there a way to get functionality similar to mkdir -p on the shell from within Python.  I am looking for a solution other than a system call.  I am sure the code is less than 20 lines, and I am wondering if someone has already written it?

What is the most elegant way to check if the directory a file is going to be written to exists, and if not, create the directory using Python? Here is what I tried:  import os  file_path = "/my/directory/filename.txt" directory = os.path.dirname(file_path)  try:     os.stat(directory) except:     os.mkdir(directory)         f = file(filename)   Somehow, I missed os.path.exists (thanks kanja, Blair, and Douglas). This is what I have now:  def ensure_dir(file_path):     directory = os.path.dirname(file_path)     if not os.path.exists(directory):         os.makedirs(directory)   Is there a flag for "open", that makes this happen automatically?


I have a Bash script that has an array called myarray.  This array contains complete file location paths for 4 files.  What I am trying to do is sort the array elements by the file creation date.  So just as a quick example, if I have the following 4 files in the array:  /tmp/file1.txt (in index 0) /tmp/test/file1.txt (in index 1) /tmp/test1/file1.txt (in index 2) /tmp/test2/file1.txt (in index 3)   ...and the file in index 2 has newer creation date then the others, it should be sorted into index 1 and so on.  I originally thought the following would do it:  myarray=($(for each in ${myarray[@]}; do echo $each; done | sort -n))   But if I look at the array contents I do not see the newest file in index 0.  Would anyone know of a way to accomplish this in bash?

I have found many answers to sort the files of directory and even to save them in an array.  Sorting Example  ls -t    Directory listing in array  array=(*)   My particular problem needs to sort files with a specific extension (say *.sh) based on their modification date/time, and save all these sorted files in array to be used later for editing or deleting file.  For example, after I have the sorted files in the array I could execute remove the most recent file by the following command.  rm ${array[0]}


Why is the minimum question view count not 0? I have never seen (if it's not ) a view count less than 1. Even for my own just published question.  Is it viewed by me? If that is true — what is the reason to make it 1, not 0?

I look today on a few fresh question, and the view count was 0. Even after I refreshed the page a few time. This is definitely a bug, since the question isn't mine.  Also I don't think the all page was cached, since that the DateTime mark was change every reload.  But maybe the SQL result is cached.


I am making an object and look like this  But when i rendered the image, it turns out like this  This is my render properties  This is the material properties  I just want to render the image like the 3d view, can anyone help me please? I am new at this, and only follow tutorial from youtube.

I've imported an .OBJ file to my scene and it looks good in viewport, but when I try to render with F12 it's completely black.  Clearing custom split normals data (in object data panel) removes black rendering issue, but also completely destroys the shading in viewport and render.  Is there a way to somehow retain the viewport like shading in render?


Today I got a new answer to my question:  but no notification was sent to me. I discovered it because I got the comment notifications. Nothing in my inbox too:     PS: I got a notification for the one I got on 23 Jan:

I  and . This answer does not appear in my inbox. I never saw a notification, and as of now the latest notification from CS is  {"SiteUrl":"cs.stackexchange.com","FaviconUrl":"https://cs.stackexchange.com/favicon.ico","CreationDate":"17 hours ago","Url":"https://cs.stackexchange.com/questions/641/language-of-the-graph-of-an-affine-function/667#667","Title":"Language of the graph of an affine function","Summary":"Hint:\n\n$53 \\cdot 100000010000000000 + 4 = 5300000530000000004$.\n\nSketch:\n\n\n  ! Assume $a$ has $n$...","Type":"answers","Count":3,"IsNew":false}   This answer was posted, deleted and undeleted while I wasn't online. I suppose the deletion removed the entry from my inbox. Then the undeletion should have recreated an entry but didn't.


I have a valid student F1 visa in my passport (till June 2016) and am currently working on OPT cap gap. My H1 visa begins on 1st October. I will be traveling through Frankfurt to India (Indian passport holder) on October 4th.  Will I be exempt from a transit visa since my F1 visa in passport is still valid and that I'll be traveling within 4 days of expiry of my opt cap gap.

I am travelling from US to India, with an Indian passport but expired F1 visa and going there to get my H1B visa stamping. I have a stop at Frankfurt, Germany for 4 hours while flying to India. Do I need a transit visa for my trip?


Is  the magnitude of the  or the travel  divided by the travel time?  A common example shows the problem: circular motion. "When something moves in a circular path (at a constant speed …) and returns to its starting point, its average velocity is zero but its average speed is found by dividing the circumference of the circle by the time taken to move around the circle. This is because the average velocity is calculated by only considering the displacement between the starting and the end points while the average speed considers only the total distance traveled." ()  In this case the magnitude of the velocity vector is zero but the speed is positive.

Speed is usually defined as the magnitude of (instantaneous) velocity. So one could assume that average speed would be defined as the magnitude of average velocity. But instead it is defined as   $$s_{\textrm{average}} = \frac{\textrm{total distance traveled}}{\textrm{total time needed}}$$  which generally speaking is not equal to the magnitude of the corresponding average velocity.   What historical, technical or didactic reasons are there to define average speed this way instead of as the magnitude of average velocity?


What are the differences between varimax and promax rotations in PCA?

Factor analysis has several rotation methods, such as varimax, quartimax, equamax, promax, oblimin, etc. I am unable to find any information that relates their names to their actual mathematical or statistical doings. Why is it called "equa-max" or "quarti-max"? In what way are the axes or matrices rotated so they have such name?  Unfortunately, most of them were invented in 1950s-1970s, so I cannot contact their authors.


Is it possible to load an .las file directly into QGIS?  I would like to be able to load LiDAR data and to be able to do analysis based various feature attributes; e.g., elevation, classifications, etc. While LASTools (which was suggested in ) is a nice set of tools, it still didn't produce an .las point file that could be read by QGIS

Is there an easy path to visualizing LIDAR data in QGIS?  I have some USGS LIDAR data in .las format downloaded from . This means I have both the .las and metadata in .xml format. I am aware , but not how to apply it to this task. I am running on Ubuntu 11.04 with QGIS 1.7.0-Wroclaw.  A similar question for ArcGIS is:  . I just need to get a sense of this data and the registration. Conversion to a DEM would be OK if I can visualize it.


I need some clarification about the future using "will" and "be going to".  Please, describe which variant sounds as a plan, that I planned in advance and it will definitely happen.   I'm going to move in America to permanent residence. I'll go to London in September.    As I understand, 1) is sounds like a plan for the future, that may be happen, but it's not clear yet. And the point 2) sounds like that will happen definitely.  Am I right? Thanks.

I know several questions were asked about the difference between "going to" and "will". Based on several answers (see, for instance, ,  and ), I understood that "will" is more spontaneous and "going to" is used with more planned actions.  So, it seems that everything is pretty fine. However, in , Kosmonaut has an answer in which he states: "Let's say that tomorrow you will walk your dog from 7 - 8 AM".  On the one hand, you probably planned to walk your dog long before and thus I should use "Let's say that tomorrow you're going to walk your dog from 7 - 8 am".   On the other hand, since I'm saying "let's say...", I'm deciding right now (thus, unplanned) that you will walk your dog. So, even though in this hypothetical situation you made a plan, I'm in a more spontaneous mood deciding right now that that's what you will do tomorrow, and, thus, I should use "will".  Which one (if any) of the above explanations is right?


I just loaded the SE page, only to see it totally revamped.  How to see hot questions from all SE sites now?

Before today, I would visit Stack Overflow every day and click somewhere in the upper-left corner (I've forgotten what it said, and it's gone now!) and if I didn't have any notifications I would see a list of interesting questions from various sites in the Stack Exchange network which - I believe - were classified as "hot".  Now this new top bar has appeared, and I have no idea how to get this list any more. I'm not really sure what it was called so my searches have been useless as well.


So I have been using Ubuntu on and off for a while now but with the recent upgrade to dual Xeons I have now decided to use Ubuntu as my main OS, but I have had problems from the start.  It would install but only boot into the shell.  Reformatted the drive and installed again but this time it would show 1 line of text saying something missing. (Can't remember what was missing)  And a few other things but now I'm here with this:   Spec Duel xeon E5 2670  Supermicro x9drl-if mobo Gtx 980  Nvidia 367 drivers (there old but was desperately trying to get this to run) 16gb ram  If anyone can help get this running it would be a great help  Thanks, Ben

My Ubuntu is stuck in a login loop when trying to enter my desktop. When I login, the screen gets black and soon after that the login screen comes back.   I've read that the problem might be caused by an error depending on the graphics, here's my graphics card: ATI Radeon 7670M


So I know I can set user info details with this snippet:  _etmc.push(["setUserInfo", {     "email": "somebody@email.com",     "details": {         "foo": "bar"      } }]);   But how do I use these custom "details"? Specifically...   Does it populate in a data extension somewhere? I don't know what sets the data for the attributes and values 1-5 in IGO_PROFILES. Do they (or can they) relate to catalogue items? If so, how can I map these attributes/tags? Do I use a tilda (~) to separate multiple values like we do with content item tags? Can I use this in personalization rules and/or scenarios, and how if so?   I can't really find any documentation on the "details" property, but I've seen examples of it where it's set the "gender" of the user.  In my mind, I'm thinking that I can assign tags or keywords like "football" to catalogue items, and then if a user has a custom attribute like "interests" set to "football" in some profile setting, then the personalization studio engine could recommend or emphasize content with "football" to that user. Is this a thing? Thanks in advance!    Edit  Thanks! I'm new to this forum and couldn't find an existing question when I searched. However, the  did not answer all of my specifics (though it did answer some! So I appreciate the link), like how to separate multiple values. Is it comma, pipe, or tilda separated?  _etmc.push(["setUserInfo", {     "email": "somebody@email.com",     "details": {         "favorite_foods" : "eggs~toast~cheese",//Tilda separated??         "favorite_colors" : "red|yellow|blue",//Pipe separated??         "favorite_sports" : "football,lacrosse,cricket",//Comma separated??      } }]);   Also, @EazyE mentioned this in their answer, quoted from  (which I already found, but didn't understand):     Match a contact attribute to a tagged catalog field to increase the   subscriber's affinity for the value of that contact attribute. The   amount of increase is less than what results from a purchase but more   than the increase from a view.   Does that mean the key, like "foo" in my first example snippet, should match something in the "updateItem" call if I want to build that connection?  _etmc.push(["updateItem", {     "item_type": "content",     "item": "1234", // CONTENT_ID     "url": "https://example.com/1234/",     "available": "Y",     "foo": "bar"//This can be matched to users??     "favorite_foods": "eggs~pancakes~bacon"//Or this?? }]);

I'm currently implementing the collect tracking code to capture the User info wherein I'm able to get the user's email id into the tracking data extension (IGO_PROFILES) but not able to capture the additional attributes (custom) likes first name or Campaign name of the user   I've included below code into my webpage,   _etmc.push(["setUserInfo", {             "email": "ABC@gmail.com",             "details": {                 "first_name": "ABC",                 "Campaign": "testCampaign"             }         }]);   Please let me know if I missed anything into above tacking code, due to which I'm  not able to capture the additional attributes.


I am making a program that scrapes information from some web services. I want to test how my program reacts when it can't reach the web service, like if the web service is down or if the local computer has no internet access. Disconnecting my whole computer from the network every time I want to run a test is far too much work.  Is there a simple way to run a program under Linux with no network access?  A command like this would be awesome:  $ no_networking "ruby my_program.rb"

Is it possible to block the (outgoing) network access of a single process?


In the beginning (big bang), mass was evenly distributed (if you consider an elementary particle as an extended object, like a circle on a very thin cylinder, with a radius near the Planck length, but in three dimensions, the circles can all sit on top of each other and still have dimension 1), after wich it clumped together in more or less sphere-like structures. Isn´t this clumping a decrease in entropy?  I don´t count force carrier particles as part of the entropy, only configurations of elementary particles, wich can form structures by the force carrier particles, the photon, gluon and the W- and Z-particles (wich according to the theory of Haïm Harari, don´t transmit the weak force; in his view the weak force is a residue force like the van de Waals force or the old strong force transmitted by massive pions, wich turned out not to be true; all force transmitting particles are massless in Harari´s view).  So the first elementary particles were in a state of maximum entropy, and the gravitational entropy was minimal.   After the big bang, the entropy of the particles that were under the influence of the three basic force transmitters decreased and the gravitational entropy increased.  Pretty far-fetched, I realize that (especially that the force carriers don´t contribute to the entropy), but I always like to see things in a new light.

Phase space theory suggests that the largest course-graining region, $p$, in a phase space, $P$, is the point in the phase space with the highest entropy. As such, it is in thermal equilibrium with the course-graining regions surrounding it.   Now, when an intensity vs frequency graph is obtained for the CMB (Cosmic Microwave Background), a curve almost identical to Planck's curve representing black-body radiation is seen. The temperature of the CMB is observed to be almost uniform across the universe, and the curve of black-body radiation represents a point of thermal equilibrium for a system. Since the CMB has the same curve as black-body radiation, this would suggest that at the birth of the cosmic microwave background, the universe was in a state of thermal equilibrium.  Referring back to the phase space spoken of in the first paragraph, since the universe was in a state of thermal equilibrium, it was at a point of highest entropy.   However, surely due to the Second Law of Thermodynamics, the entropy of the universe would need to decrease - so it wouldn't be possible for the entropy of the universe to be in such a high state so soon after its birth - so it should surely begin in a low state of entropy.  So what's the deal here? Did the universe begin in a really low state of entropy, or a really high one? Are all my explanations here logical or quite inaccurate?


I have just started reading real analysis. The topics include sequences, series, continuity, differentiability, integration, series of functions , calculus in higher dimensions etc.  I am in need of a text and a reference book.  Can someone please tell me about it?  The text should not be very broad as I need something to finish before my exam.But the reference should be broad, with full of exercise and examples. Hint to exercise will help me a lot.  Waiting for your response.

Does anyone have a recommendation for a book to use for the self study of real analysis? Several years ago when I completed about half a semester of Real Analysis I, the instructor used "Introduction to Analysis" by Gaughan.   While it's a good book, I'm not sure it's suited for self study by itself.  I know it's a rigorous subject, but I'd like to try and find something that "dumbs down" the material a bit, then between the two books I might be able to make some headway.