$$ \frac{xdx+ydy}{xdy-ydx}=\sqrt{\frac{a^2-x^2-y^2}{x^2+y^2}} $$   This is asked many times and attmpted to solve particularly at  by @Simon S by seting $u=x^2+y^2$ and $v=\dfrac{y}{x}$ $$ LHS=\frac{du}{2x^2dv}=\frac{du}{2dv}.\frac{1+v^2}{u}\\ RHS=\sqrt{\frac{a^2-u}{u}}\\ \frac{du}{2dv}.\frac{1+v^2}{u}=\sqrt{\frac{a^2-u}{u}}\implies\boxed{\int\frac{du}{\sqrt{u(a^2-u)}}=\int\frac{du}{\sqrt{-[u^2-a^2u}]}=2\int\frac{dv}{1+v^2}}\\ \int\frac{du}{\sqrt{-[u^2-2\frac{a^2}{2}u+\frac{a^4}{4}-\frac{a^4}{4}]}}=\int\frac{du}{\sqrt{\Big(\dfrac{a^2}{2}\Big)^2-\Big(u-\dfrac{a^2}{2}\Big)^2}}=2\int\frac{dv}{1+v^2}\\ \implies \sin^{-1}\bigg[\frac{u-\dfrac{a^2}{2}}{\dfrac{a^2}{2}}\bigg]=2\tan^{-1}v+C\\ \color{red}{\sin^{-1}\bigg[\frac{x^2+y^2-\dfrac{a^2}{2}}{\dfrac{a^2}{2}}\bigg]=2\tan^{-1}\frac{y}{x}+C}\\ $$  But my reference and the post that I mentioned give the solution $\sqrt{x^2+y^2}=a\sin\Big[C+\tan^{-1}\frac{y}{x}\Big]\implies\color{red}{\sin^{-1}\frac{\sqrt{x^2+y^2}}{a}=\tan^{-1}\frac{y}{x}+C}$, so are both the same or am I missing something here ?  Note: This isn't about exactly how to solve the differential equation, which is what is asked in the mentioned post(already specified by me in the first place), I am having trouble equating the form of solution given there, kindly look into it before marking it duplicate.

solve the differential equation.   $$\frac{xdx+ydy}{xdy-ydx}=\sqrt{\frac{a^2-x^2-y^2}{x^2+y^2}}$$  The question is from IIT entrance exam paper. I have tried substituting $x^2=t\ and \ y^2=u$ but was not a worth try.   Thanks in advance.


Source:   Example:     Authors and linguists are delighted that the creators of this technology did not use an acronym for it. But why did they choose the name Bluetooth? Because it crunches data? Because it takes bytes? Forget about finding a metaphor. Bluetooth is named for the Viking King Harald Bluetooth, who ruled Denmark and Norway in the eleventh century. King Harald is famous for converting to Christianity after watching a German priest succeed with a miraculous dare.   Why the? Can't we just simply say is named for Viking King Harald Bluetooth?

I read news on the BBC (on its website) this morning. When I was reading the news I noticed the definite article the was missing in a sentence. As per my opinion, the reporter missed the article the. But I also thought that the reporter also had some point as he did not use the article there. So I just wanted to confirm so landed here to get some help on it.     On the website:      It also proclaimed the group's leader, XYZ  (name), as caliph and   "leader for Muslims everywhere".      As per my opinion it should have been:      It also proclaimed the group's leader, XYZ  (name), as the caliph and   "leader for Muslims everywhere".   Source link:


The sample size is 288 and by Shapiro- Wilk test the data is not normally distributed.

A former colleague once argued to me as follows:      We usually apply normality tests to the results of processes that,   under the null, generate random variables that are only   asymptotically or nearly normal (with the 'asymptotically' part dependent on some quantity which we cannot make large); In the era of   cheap memory, big data, and fast processors, normality tests should   always reject the null of normal distribution for large (though not insanely large) samples. And so, perversely, normality tests should   only be used for small samples, when they presumably have lower power   and less control over type I rate.   Is this a valid argument? Is this a well-known argument? Are there well known tests for a 'fuzzier' null hypothesis than normality?


My partner needs to apply for a schengen visa (double entry), we land in france and will spend 4 days and four nights there, then fly out of the schengen area for 18 days then fly back to spain where we will also spend 4 days and four nights, so the total number of days and nights is the same for both schengen countries, but we have slightly more hours totally in spain.  So do we apply at the french emabassy since that is our first stop and we will spend the same amount of days and nights there as we will in spain, or do we apply at the spainish embassy as we have slightly more time there (if they consider total hours) even though that is a second destination?  Thanks!

I'm planning to go to Germany on Sept 6-8, then Netherlands on Sept 8-11 and exit Switzerland on Sept 11-14.  My question is:  Which embassy do I need to apply for the Schengen visa? The number of days are the same for Netherlands and Switzerland, but I'm planning to apply in Netherlands since it will be my second point of entry.


I know that a station can only be used to serve as a connection over another player's route between the station-city and another city.    But can a single station be used to claim different routes for different destination tickets or must the same (one) route be used for all of your destination tickets?    The rules are a bit unclear, but my understanding is that the same route must be used for all of your destination ticket.

I played a game of Ticket to Ride Europe recently, I don't own it but am vaguely familiar with the rules. When we started playing however there was some confusion about the placement of stations and I was out-voted 3:1. What the rules specifically say:     A Train Station allows its owner to use one, and only one, of the routes belonging   to another player, into (or out of) that city to help him connect the cities on his   Destination Tickets.    My interpretation is that this allows you to do what it says, use a single route owned by another player. The next bit toward the end of the section however states:     If a player uses the same Station to help connect cities on several   different Tickets, he must use the same route into the city with the   Station for all of those Tickets. The Train Station owner does not   need to decide which route he will use until the end of the game.   At this point the same route into the city statement was picked up really strongly. The group believed that this means several routes going out of a city could be used, as long as the same route into the city was used. In the end this meant that during the scoring they believed in the following diagram (red routes):   A continuous path from Frankfurt->Madrid exists. No continuous path from Brest->Madrid exists because it didn't use the same route into Paris as the Frankfurt route, and therefore couldn't share the blue link.     Can someone confirm if I'm correct, in that you can only use 1 link, and in this scenario both destination tickets are completed at the end of the game. If so can you think of any convincing arguments I can put forward to the group?


Help me to fix this problem. The page should display - instead of â€“.  I already have <meta charset="utf-8" /> on my html <head>, I'm using visual studio code set to UTF-8, and the database. I'm using is mySQL, the version of my laravel is 5.4.  The â€“ comes from the database and i'm not allowed to alter it.

I'm setting up a new server and want to support UTF-8 fully in my web application. I have tried this in the past on existing servers and always seem to end up having to fall back to ISO-8859-1.  Where exactly do I need to set the encoding/charsets? I'm aware that I need to configure Apache, MySQL, and PHP to do this — is there some standard checklist I can follow, or perhaps troubleshoot where the mismatches occur?  This is for a new Linux server, running MySQL 5, PHP, 5 and Apache 2.


I thought about it for a long time $$\prod_{k=1}^{n}\sin(\frac{k\pi}{2n})=\frac{\sqrt{n}}{2^{n-1}}$$

Using $\text{n}^{\text{th}}$ root of unity  $$\large\left(e^{\frac{2ki\pi}{n}}\right)^{n} = 1$$  Prove that   $$\prod_{k=1}^{n-1}\sin\frac{k \pi}{n} = \frac{n}{2^{n-1}}$$


Is it okay to always use SELECT * even if you only need one column when retrieving data from MySQL? Does it affect the speed of the query or the speed of the system? Thanks.

I've heard that SELECT * is generally bad practice to use when writing SQL commands because it is more efficient to SELECT columns you specifically need.  If I need to SELECT every column in a table, should I use   SELECT * FROM TABLE   or   SELECT column1, colum2, column3, etc. FROM TABLE   Does the efficiency really matter in this case? I'd think SELECT * would be more optimal internally if you really need all of the data, but I'm saying this with no real understanding of database.  I'm curious to know what the best practice is in this case.  UPDATE: I probably should specify that the only situation where I would really want to do a SELECT * is when I'm selecting data from one table where I know all columns will always need to be retrieved, even when new columns are added.   Given the responses I've seen however, this still seems like a bad idea and SELECT * should never be used for a lot more technical reasons that I ever though about.


I test all the suggested answers but still I canon't reset or remove password or even reinstall the mysql db on Ubuntu 16.04, Is there any ohter idea?   #1045 - Access denied for user 'root'@'localhost' (using password: YES)

I've set up mysql and phpmyadmin and chose not to set a password when installing hoping that once set up i could login with root and no password but i get the following error from phpmyadmin:  Login without a password is forbidden by configuration (see AllowNoPassword)   I have previously moved the phpmyadmin folder to /var/www/   I have tried changing the following line  $cfg['Servers'][$i]['AllowNoPassword'] = false;   to  $cfg['Servers'][$i]['AllowNoPassword'] = true;   but still had no success, so i am wondering is there a way i can change the root passwords for both so i can access phpmyadmin and create databases.


What is the meaning of t value and Pr(>|t|) when using summary() function on linear regression model in R?  Coefficients:                               Estimate Std. Error t value Pr(>|t|)     (Intercept)                    10.1595     1.3603   7.469 1.11e-13 *** log(var)                        0.3422     0.1597   2.143   0.0322 *


According to genymotion I don't have virtualization enabled (VM installed through apt-get and genymotion from the page) cannot virtualize with VM either...      your CPU is incompatible with virtualization technologies   My CPU should support "virtualization:AMD-V" as the lscpu command says.  But when I go into my BIOS menu to enable virtualization I can't find where to enable it. There is nowhere anything about CPU or Virtualization or Advanced options which I've seen mentioned elsewhere.

So I am trying to run Ubuntu in a virtualbox but on installing 12.10 from the .iso I was greeted by a warning telling me that audio wouldn't work then I pressed next and this popped up:  Failed to open a session for the virtual machine Tux 3 VT-x features locked or unavailable in MSR (VERR_VMX_MSR_LOCKED_OR_DISABLED) Details  Result Code:  E_FAIL (0x80004005) Component:  Console Interface:  IConsole {db7ab4ca-2a3f-4183-9243-c1208da92392}   And then it doesn't work.  I assigned 4GB of my 8GB to Ubuntu, 100 dynamically allocated GB of space, and 12MB of graphics memory. I'm running an Asus p8z77 V LX mobo with an Intel i5 3550 processor.   Downloaded 12.04.2 on my PC and tried again. Still getting the same message.


In my experience I've used (to some degree) both emulators and debuggers. I've used them both for loading binaries (containing production code) into flash memory. I've also used them while developing programs in C and C++. On one hand you have your expensive $10,000 emulator (like the ) or you have your humble  debugger (roughly $90). In my limited experience in roles involving embedded systems, I guess I've never really gotten down to the nitty gritty where I've needed to notice the difference.  One of my co-workers thinks that an emulator would allow you to directly connect to a processor and control it via JTAG. So I guess they are saying that you'd also be able to see dissassembly and be "attached" while stepping through the running embedded software. Is this true? If that's true then it is the only difference I could see. What are some other difference between the two?

In-circuit emulators (abbreviated ICE) boast about their awesome debugging features, and also boast high price tags.    In-circuit debuggers (abbreviated ICD) can do most of the stuff that an ICE can do, but often cost much less.  I know that way back in the day, ICEs would actually remove the problem chip from the socket and replace it with an emulator cable, but with modern QFN, BGA, and fragile TQFP packages, it seems that most products calling themselves "ICE" debuggers are connected to a debug header in much the same way that an ICD would be.  Here are some examples of products which use "ICE" in the name:        There are also JTAG 'ICE" products from several vendors.  Note that I'm not discounting these because they're not physically in-circuit, but I would discount them if they don't function as a true ICE.  In what sort of development tasks do I need an ICE, and when should I be content with an ICD?  Let's assume that I want to step through my code, and not use LEDs and printf() statements.  What are some examples of problems which you've solved with an ICE but could not (realistically) have solved without it?


Title says it all. Kindly inform what other verbs can't be used with present continuous.

As a nonnative speaker of English I was always taught in school that there are verbs that cannot be used in the continuous form, i.e.  the stative verbs. However, I've seen some stative verbs used in the continuous form in American English, especially the verbs wish, feel, hope, guess, love and like. Is using these stative verbs in the continuous form wrong? If it's not, what's the difference between using them in the simple and continuous forms?


I am failing to understand following problem with my bibliography....citation in text works fine, citations in bibiography work fine too, except one problem: I want it like "Planen und Problemlösen: Überlegungen zur ...." but it results in "Planen und Problemlösen: überlegungen zur ....". I have no idea how to force LaTeX giving me a big Ü instead of a tiny ü.  MWE:  \documentclass[12pt,ngerman]{article} \usepackage[utf8]{inputenc} \usepackage[ngerman]{babel} \usepackage[backend=biber,style=apa]{biblatex} \usepackage[german=quotes]{csquotes}%mod. \usepackage[locale=US]{siunitx} \DeclareLanguageMapping{ngerman}{ngerman-apa} \addbibresource{Literatur.bib}  \begin{document} Hello, this is my cite: \cite{Funke.1990} \printbibliography \end{document}   In my Literatur.bib:  @Article{Funke.1990, Title  = {{P}lanen und {P}robleml{\"o}sen: {\"{U}}berlegungen zur  neuropsychologischen {D}iagnostik von {B}asiskompetenzen beim {P}lanen}, Author = {Funke, Joachim and Glodowski, Anne-Simone}, Journal= {Zeitschrift f{\"u}r Neuropsychologie}, Year  = {1990}, Pages = {139--148}, Volume = {2} }

When using the apa style together with biblatex uppercase umlauts (like Ö) are always printed lowercase except at the beginning. With the default biblatex style it works fine. How can I fix this?  Example  \documentclass{scrbook}  \usepackage[utf8]{inputenc}  \usepackage{filecontents}  \begin{filecontents}{test.bib} @incollection{Brosse.1995,  author = {Br{\"o}sse, Ulrich},  title = {{\"{O}}konomisches {V}erhalten als bester {W}eg zu einer nachhaltigen {U}mweltverbesserung},  booktitle = {{\"{O}}konomie contra {\"{O}}kologie?},  year = {1995} } \end{filecontents}  \usepackage[ngerman]{babel}  \usepackage[backend=biber,sorting=nyt,style=apa]{biblatex} % this does not work \DeclareLanguageMapping{ngerman}{ngerman-apa}  %\usepackage[backend=biber,sorting=nyt]{biblatex} % this works  \bibliography{test}  \begin{document} \cite{Brosse.1995} \printbibliography \end{document}


I was wondering if bonuses to stats could affect the number of uses of certain abilities, specifically, do you get more uses of the Battle Cry feat if you got a Ioun Stone giving you +2 to Charisma?  If so, which uses get consumed first, the ones given by the bonus? What happens if after using Battle Cry, the Ioun Stone gets destroyed, making you lose the bonus?

What is implied by a "temporary ability bonus"?  I've noticed this wording on all of the stat boosting items in the core book.     Treat this as a temporary ability bonus for the first 24 hours the headband is worn.   From:   What is different about the effects of the item on the first twenty four hours, and why does this caveat matter?


To prove that means $n\neq x^2+y^2$, so I started with $n\equiv 3 (mod 4)$,  then I don't know how to go on.

Let $u$ be an integer of the form $4n+3$, where $n$ is a positive integer. Can we find integers $a$ and $b$ such that $u = a^2 + b^2$? If not, how to establish this for a fact?


I've only started coding in java recently for a summer course at my uni so my code knowledge and code are subpar.  This assignment  requires me take make a User class with a login method and accessors and mutators. A EmailSystem class that has a dynamic-sized collection of users, a registerUser method that will create a User object and add it to the list of users, and a listUser method that will iterate through the list of users.  Code for EmailSystem class:  public class EmailSystem {    public static ArrayList<User> userList = new ArrayList<>();     public static void registerUser(String firstname, String lastname, String username, String password) {       User myUser = new User(firstname, lastname, username, password);       userList.add(myUser);       }     public static void listUsers () {       for (int i=0; i<userList.size(); i++)       {          System.out.println(userList.get(i));       }    }     public static void main(String[] args) {       registerUser("John", "Doe", "Username", "Password");    } }   Code for User class  import javax.swing.JOptionPane; import java.util.*;  public class EmailSystem {    public static ArrayList<User> userList = new ArrayList<>();     public static void registerUser(String firstname, String lastname, String username, String password) {       User myUser = new User(firstname, lastname, username, password);       userList.add(myUser);       }      public static void listUsers () {       for (int i=0; i<userList.size(); i++)       {          System.out.println(userList.get(i));       }    }     public static void main(String[] args) {       registerUser("John", "Doe", "Username", "Password");       boolean hasExit = false;       while (hasExit == false)       {          String options = "";          options = JOptionPane.showInputDialog("The following actions are supported. Enter the code: \nA: Login\nB: Print Users\nC: Exit");          if (options.equalsIgnoreCase ("A"))          {             String username = JOptionPane.showInputDialog("Username");             String password = JOptionPane.showInputDialog("Password");             // I would like to check whether the username and password submitted here are the same as the one used to register               // Use userLogin method here to compare the username and password that is inputted here and the username and password that was created when registering.          }          else if (options.equalsIgnoreCase ("B"))            {             listUsers();          }                else if (options.equalsIgnoreCase ("C"))          {             hasExit = true;          }       }       } }   When registering a user how would I be able to run the the userLogin method on the created object? Or should I be doing something else entirely?

I've been using the == operator in my program to compare all my strings so far. However, I ran into a bug, changed one of them into .equals() instead, and it fixed the bug.  Is == bad? When should it and should it not be used? What's the difference?


I have found a sentence in a text in which the word 'very' works as an emphatic word. The sentence is: "These very habits should be formed in student life." The word 'very' emphasizes the noun 'habits' here. I have found this types of emphasizing first. So, I don't know so much about it. Please someone make me understand how 'very' works as an emphatic word. When, where and how can I use it in sentences? Please make me clear about it.

Are these correct ways to use very with a noun?  She is the very girl I want. On the very year of 2012, comes the end of the world. This is the very company everyone wants to work for.  What I understand is that very can be used to emphasize the importance of a noun.


I wan't to create a Meadow Scene and there is a lot of low lying detailed fog that is moving and rising very slowly like these in reference pictures If I adds simple principled volume shader it will not have such details like this mist is rised to some level or height in picture 1 after that it disappears   Mainly Picture 1 is the correct reference picture for the result what i want      how can i create that can any one show me the node setup ?

Hello Blender community,  I am a huge fan of the Disney movie Zootopia, the amount of physics and detail really drew me into 3D animation and design. Although I always had an interest in 3D technologies, designs, animation, etc. This movie really pushed me into getting into making 3D stuff, and learning Blender.  Anyway, as a learning experience, I decided to take multiple different 'animating techniques' of the movie and try to replicate in Blender.   The scene I'm trying to replicate? The Limo scene, specifically the low, lying smoke.    I have analyzed this scene many times and I have concluded on some of its properties   It lively collides, with the characters, meaning that it is not a textured material, it is most likely mesh based. It has a lower temperature value than other objects, which is why when the characters breathe, an amount of fog appears (This is because the movie was designed in the Hyperion Renderer, I don't really need this, but if you know how to make this please let me know) It is somewhat fluffy, although not cloud-like. When a mass of this smoke comes together, it makes a fluffy looking mass. It is affected by gushes of air, when Judy (the bunny) lands on the ground, a gush of air extrudes the smoke around her. Sudden movements have this effect as well.   Now I'm pretty sure that making this is in Blender is difficult or even impossible, considering that Disney has their own proprietary rendering engine named Hyperion and they can drop smoke in within a couple of clicks. And they have HUGE render-farms that can render these details.  But I just wanted to know if it is possible. As I may be getting an internship for Disney Animation, I need to know this stuff  UPDATE: So, I see that using a still frame from the movie to demand something that needs multiple frames, is pretty stupid  So feel free to study this clip:  (and if you haven't seen the movie, do yourself a favor and please have a watch)  Also, I would like to know, how to smoke kind of 'flows', the way that it lies low to the ground moving. Not just stuck in place similar to how Cycles does it.


I'm currently playing Curse of Strahd. Personally knowing some actual Vampiric Lore and having also read through the Monster Manual, I know that running water is a weakness to Vampires.   Is rain considered Running Water for a Vampire's weakness Harmed by moving water?   This was brought up, in our game, due to Strahd standing out in the rain for our first time meeting him.

The Decanter of Endless Water, DMG pg. 161, can fire a 30 foot long, 1 foot wide stream of water that can knock a target prone. On top of that, it keeps streaming until the end of my next turn (important).  A Vampire, MM pg. 297, takes 20 acid damage if it ends its turn in running water.  If I somehow manage to get this going on a vampire that we've prevented from moving, would this count as running water?


I have a very strange problem with NullPointerException. Code example is as follows:  ... ... public String[] getParams(...) { ...   ... ...   ...  143   return new String[] { 144     getUserFullName(), 145     StringUtil.formatDate(sent),  .      tiltu,  .      StringUtil.initCap(user.getName()),  .      vuosi.toString(),  .      asiatyyppi[0] + " " + lisatiedot[0],  .      asiatyyppi[1] + " " + lisatiedot[1],  .      alaviitteet[0], 152     alaviitteet[1]}; 153  }   Now, I have got an issue from production having a stack trace:  java.lang.NullPointerException     at package.EmailService.getParams(EmailService.java:143) ...   I am unable to produce that kind of stack trace myself. It maybe some environment issue that for some reason line numbers don't match. If I have null references on any variable stack trace points to that specific line but never to line 143.  But what I want to ask is: is it possible to produce NullPointerException at line 143 specifically?

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?


I was reading nuclear physics in which it was mentioned that the coulomb barrier for proton is 400keV corresponding to a temperature of 3 billion Kelvin.I want to know then how does nuclear fusion reactions takes place inside sun's core where average temperature is 0.015 billion kelvin

Given that the sun’s temperature is lower than the temperature needed to fuse two protons. How does the sun provide enough energy for this fusion to happen?  Has it do something with tunneling and $E = mc^2$ ? I just can´t seem to understand the concept. If someone could simplify this for me, I would be grateful.   From this , it says " The fusing of two protons which is the first step of the proton-proton cycle created great problems for early theorists because they recognized that the interior temperature of the sun (some 14 million Kelvins) would not provide nearly enough energy to overcome the coulomb barrier of electric repulsion between two protons. With the development of quantum mechanics, it was realized that on this scale the protons must be considered to have wave properties and that there was the possibility of tunneling through the coulomb barrier.".   I was reading through this and my belief was that the sun actually provided a high enough temperature to fuel fusion, however after reading this I am quite confused.


For some reason, BibLaTeX doesn't work. Here's my minimal example.  \documentclass[a4paper]{article}  \usepackage[utf8]{inputenc} \usepackage{csquotes}  \RequirePackage{filecontents} \begin{filecontents}{refs.bib} @book{doe13,     address    = {City},     title      = {A nice title},     shorttitle = {Short title},     publisher  = {Publisher},     author     = {Doe, John},     year       = {2013} } \end{filecontents}  \usepackage[backend=biber]{biblatex} \addbibresource{refs.bib}  \begin{document}  Hello. \cite{doe13}.  \nocite{*}  \printbibliography  \end{document}   I am using MiKTeX 2.9 32-bit.  When I run pdflatex sample.tex, I get the following warings:  LaTeX Warning: Citation 'doe13' on page 1 undefined on input line 23. LaTeX Warning: Empty bibliography on input line 27.   The generated PDF contains     Hello. [doe13 ].   and the page number, nothing else. There's no bibliography.  Running biber sample gives me the following message:  > biber sample INFO - This is Biber 1.5 INFO - Logfile is 'sample.blg' data source C:\Users\Paul\AppData\Local\Temp\par-5061756c\cache-890efc00b3ca6b77 5c7d44a325c1349fb2a3a3bd\inc\lib/Biber/LaTeX/recode_data.xml not found in .   Like , the warning in biber can be fixed by removing the entire directory C:\Users\Paul\AppData\Local\Temp\par-5061756c. After that, new warnings occur, the pdflatex warnings are the same as well as the resulting PDF.  > biber sample INFO - This is Biber 1.5 INFO - Logfile is 'sample.blg' INFO - Reading 'sample.bcf' WARN - Warning: Found biblatex control file version 2.5, expected version 2.3 INFO - Using all citekeys in bib section 0 INFO - Processing section 0 INFO - Looking for bibtex format file 'refs.bib' for section 0 INFO - Decoding LaTeX character macros into UTF-8 INFO - Found BibTeX data source 'refs.bib'   What else can I do?

I've browsed the forums and found a number of posts that have addressed this issue, but none of the solutions seem to work for me. I have the following script that I just copied from the bibtex home page to get familiar with it. Instead of the citation number I get a question mark. I compile using Latex+Bibtex+Latex+Latex+PDFLatex+ViewPDF just as has been previously suggested and the problem persists.   \documentclass[11pt]{article} \usepackage{cite}  \begin{document}  \title{My Article} \author{Nobody Jr.} \date{Today} \maketitle  Blablabla said Nobody ~\cite{Nobody06}.  \bibliography{mybib} \bibliographystyle{plain} \end{document}   My bibliography (Bib.bbl)  @misc{ Nobody06, author = "Nobody Jr", title = "My Article", year = "2006" }    Looking at previous posts one thing that is concerning is that my .bbl looks empty as shown below. Further, I don't have a .blg  \begin{thebibliography}{}  \end{thebibliography}


When I was a marker, a student came to meet me to complain that I did wrong in the assignment marking but he didn't bring his assignment. I assumed that what he claimed was true and apologized. Then he just kept complained about something and then asked if I accepted that my marking was bad, and I accepted. He claimed he would tell the university and they would do something to me, and then asked my name and contact information and left. Later I found that what he even talked to the wrong TA. Was this student misbehaving and should I have kicked him out of my office in the very first place? I was only told by the instructor to meet with students to talk about marking issues and have no other idea.

An annoying aspect of working with a "strict" grading system (e.g., 90%+ = A, 85% = A-, 80% = B+, etc.) is what I call the "grade grubbing" phenomenon: the people who feel compelled to raise complaints about the grading because they didn't get the final score they want—but have no real argument in support of a higher grade. This is not about legitimate requests to reconsider because of a mistake but instead students searching for any reason why they deserve the X points they need to get a better grade. It’s exemplified by the kind of argument that begins “I know it’s wrong but . . . .”  I do not have the power to change the grading structure—that is imposed from higher up.   Are there any satisfactory methods of discouraging such behavior? I don't want to stop people with legitimate issues from asking for regrades (mistakes happen!), but I would like to avoid having to deal with the student who tries every which way to get the few points they need to move up a level.


My disk is almost full, how can I know where takes away the most disk?  Because yesterday the disk is enough for my System.   [root@ha-node1 log]# df -lh  Filesystem      Size  Used Avail Use% Mounted on /dev/sda2        18G   18G  4.3M 100% / devtmpfs        3.9G     0  3.9G   0% /dev tmpfs           3.9G   54M  3.8G   2% /dev/shm tmpfs           3.9G  383M  3.5G  10% /run tmpfs           3.9G     0  3.9G   0% /sys/fs/cgroup /dev/sdc         20G   45M   19G   1% /mnt/sdc /dev/sdb         20G   83M   19G   1% /mnt/sdb tmpfs           781M     0  781M   0% /run/user/0

When administering Linux systems I often find myself struggling to track down the culprit after a partition goes full. I normally use du / | sort -nr but on a large filesystem this takes a long time before any results are returned.  Also, this is usually successful in highlighting the worst offender but I've often found myself resorting to du without the sort in more subtle cases and then had to trawl through the output.  I'd prefer a command line solution which relies on standard Linux commands since I have to administer quite a few systems and installing new software is a hassle (especially when out of disk space!)


Using $@  instead of $* would preserve quoting. Consider the following script:  #!/bin/bash # Test.sh for arg in $@ do echo "I found the argument $arg" done  ./Test.sh "One Two Three"   I reach the output below:  I found the argument One I found the argument Two I found the argument Three   I don't understand why the For loop is executed three times?!

Consider the following code:  foo () {     echo $* }  bar () {     echo $@ }  foo 1 2 3 4 bar 1 2 3 4   It outputs:     1 2 3 4       1 2 3 4   I am using Ksh88, but I am interested in other common shells as well. If you happen to know any particularity for specific shells, please do mention them.  I found the follwing in the Ksh man page on Solaris:     The meaning of $* and  $@  is   identical  when  not  quoted  or  when  used  as a parameter   assignment value or as a file name. However, when used as  a   command argument, $* is equivalent to ``$1d$2d...'', where d   is the first character of the IFS variable,  whereas  $@  is   equivalent  to  $1 $2 ....   I tried modifying the IFS variable, but it doesn't modify the output. Maybe I'm doing something wrong?


I was working on the Rigging for Dragon and I hit an unknown key stroke and my Texture turned Hot Purple. Nothing I do fixes it. Tried reloading the Texture to not avail. I turn off The Textured Solid and my model returns to colorless form. I did something to the texture or What not sure. ANY have an Idea on how to get my texture back?

I made a character, and its one of my first times texturing, and I saved my character into a new folder, and when I came back to the model ALL the textures were pink, I used to know what to do, but I stopped texturing, how do I bring my textures back?


I'm throwing this feature request out in response to the following two questions.       The current system for suggested edits seems to work perfectly fine in all cases but one: when a user (or group of users) decides to search for possible typos and edit posts en masse. I entirely agree with .        I do not believe it is possible to fix all the issues that might exist in the posts this way.   If you don't have edit privileges, you're causing work for users. Now, nobody minds this, unless you're not fixing all the issues in a   post and it's clear there's no thought going into the process at all.   Editing bumps things to the SO home page. Again, nobody minds and this is by design, but if you're fixing one tiny issue, is that a   reason to bump 100 questions to the home page? I'd say if you're   fixing all the issues with a post - including flagging what should be   flagged, closing what should be closed etc - great. If you're not,   you're bumping a whole lot of stuff...      There are a few more issues to consider, as well.   Even though a single user can (theoretically) suggest an unlimited number of edits, reviewers are limited in the number of edits that they can accept or reject per day. Most behavior on the Stack Exchange network is rate-limited: why shouldn't suggested edits be, as well? A single user's suggested edits can take up a disproportionate amount of the reviewers' time.   I therefore propose placing a limit on the rate of each user's suggested edits. There are a number of ways we could do this.   Limit the number of suggested edits per user per day—to approximately 100? This is a high enough threshold for any reasonable number of daily edits, and besides, after 100 suggested edits get approved there's no rep in it for the editor anyway. Limit the number of suggested edits per user per hour. Limit the number of outstanding (unreviewed) edits per user at any given time.   I personally like the last solution because it would encourage people to spend more time on each suggested edit and it would optimize for the valuable resource that is being spent on each suggested edit: reviewers' time.

We need a hard rate limit on suggested edits, to limit the damage someone can do with blasting the review queue with minor edit suggestions.  Case in point:  peppered the site with a whopping 133 tag-only edit suggestions in 2 hours and 15 minutes. That's one edit every minute on average, but towards the end he was entering a new suggestion every 20 seconds. He only stopped because a  drew enough rejections to have him banned from entering more.  If there was a limit to the number of suggested edits you can enter in a time period we could have stopped this guy earlier. No <2k user needs to edit hundreds of tags across that many questions in 2 hours time.  Considerations   There are cases where a retag drive or tag burninate justifies editing a larger number of posts, but I'd be fine if such tasks were limited to people with 2k+ reputation. A retag or burninate job requires a minimal engagement with the community to know when they are justified anyway. The suggested edit review process, by itself, was clearly not enough to stop this barrage. It cannot be seen as a rate limiting measure, at least not as a sufficiently efficient one.  The vast majority of the edits made in the above example were too minor, leaving spelling, grammar and formatting mistakes in the post untouched. The user was going too fast to pay attention to such details anyway. Yet this user has 98 approved edit suggestions, but all but 6 or 7 I'd have rejected as too minor, so the review process itself is broken.   What should be limited   The number of review votes reviewers have is already limited; I burned through 20 reviews in short order just reviewing the suggestions from just this one user. Certainly the number of unreviewed suggestions should be limited to let reviewers catch up with a user like this. I'd say having 20 outstanding suggested edits pending review is plenty. Suggested edits should be made with some consideration; we don't want minor edits, so if you are suggesting more than 20 in an hour (that's 1 every 3 minutes) you are not improving posts anymore, you are gaming the system to gain reputation.


I'm very new to C++ and object-oriented programming in general. I'm trying to wrap my hand around classes, and accessors (getters and setters).  Say I have the class Person. Its nothing too important, it just stores a person's name and HP. The name is a string, and the HP is an integer. I already know that it is incredibly stupid to leave both these variables in the public access specifier, so I would leave both the name and the HP in the private access specifier instead. I understand that I can use a constructor to set the variables when first creating an instance of the object, but things like HP have to be consistently updated...  Which brings in the concept of getters and setters.  By using public getter and setter functions, I would be able to change the HP of the Person object. This however, would result in the breaking of encapsulation, which no one wants.  I understand that getters can be mandatory in C++ in some occasions, but are there any alternatives to setters? Thanks.  BTW, here's some code that shows what I've been trying to show...  #include <string> using namespace std;  class Person {     public:         Person(string setName, int setHp) {             setName = name;             setHp = hp;         }         int getHP() {             return hp;         void setHP(int hpSet) {             hp = hpSet         }     private:         string name;         int hp; }  int main() {     Person guy("Mark", "100");     // Say Mark here was attacked or something... his HP would go down...     guy.setHP(75);     return 0; }

I'm currently working on a simple game in Java with several different modes. I've extended a main Game class to put the main logic within the other classes. Despite this, the main game class is still pretty hefty.  After taking a quick look at my code the majority of it was Getters and Setters (60%) compared to the rest that is truly needed for the logic of the game.  A couple of Google searches have claimed that Getters and Setters are evil, whilst others have claimed that they are necessary for good OO practice and great programs.  So what should I do? Which should it be? Should I be changing my Getters and Setters for my private variables, or should I stick with them?


Let $\mathbb{D}$ be the unit disk and $\mathbb{T}$ be the boundary of   that unit disk.         (a)Show that f(0) is a real number.      (b) Show that for each   $z\in\mathbb{D}$ we must have $f(z)\in\mathbb{R}$.      (c) Show that f   must be a constant function.   For part (a) I have used the Cauchy integral formular $$f(0)=\frac{1}{2\pi i}\int\limits_{T}\frac{f(z)}{z}dz$$.  Thus by using the parameterization $z=e^{i\theta}$ we obtain $f(0)$ equal to a real integral .    Also I know that for part (c) I can use the answer from part (b) together with the open mapping property of a holomorphic function.     But I would like a help to go with part (b)

Let $f(z)$ be entire function. Consider the functions $e^{if(z)}$ and $e^{−if(z)}$ and applying the Maximum Modulus Theorem, show that if $f(z)$ is real when $|z| = 1$, then $f(z)$ must be a constant function.  (We take $f(z)=u(z)+iv(z)$)  I am confused as so far I have $|g(z)|=|e^{if(z)}|=|e^{-v(z)}|$ and then since $f(z)$ is real, $f(z)=u(z)$ and $v(z)=0$ so I assumed it would follow that $|g(z)|=|e^{v(z)}|=1$.  Similarly, $|g(z)|=|e^{-if(z)}|=|e^{v(z)}|=1$.  Using Liouville I assumed one could say that both $g(z)$ and $h(z)$ are bounded entire functions, they are constant and so it follows that $v(z)$ is constant, meaning that both its partial derivatives are equal to 0 and, due to Cauchy Riemann, both of the partial derivatives of $u(z)$ are equal to zero.  It would then follow that $f(z)$ is constant.  I don't know how to go about the question using the Maximum Modulus Theorem, also I feel I am overlooking the importance of $|z|=1$ perhaps?  Any help would be much appreciated!!


Can someone please refer a good article explaining why we use a Sigmoid activation in the final layer of a neural network and a ReLu activation in the middle layers and input layer while building a Convolutional Neural Network? I am not getting how that results in the right output.

The question is simple: is there any advantage in using sigmoid function in a convolutional neural network? Because every website that talks about CNN uses Relu function.


I am still fairly new with Ubuntu and I forgot the command to show all the users of a group. How do you show all the users in all thee groups?

How can I see all the members of a group in Linux?


How can I use grep and/or find to find all files which have all of specfied words?  So something like   grep -R -words 'Quick', 'Lazy', 'Jumped' /   would return all files on system with words Quick, Lazy and Jumped.  Is there any support or should I be looking to write my own script?

I'm looking for a way to list all files in a directory that contain the full set of keywords I'm seeking, anywhere in the file.  So, the keywords need not to appear on the same line.  One way to do this would be:  grep -l one $(grep -l two $(grep -l three *))   Three keywords is just an example, it could just as well be two, or four, and so on.  A second way I can think of is:  grep -l one * | xargs grep -l two | xargs grep -l three   A third method, that appeared in , would be:  find . -type f \   -exec grep -q one {} \; -a \   -exec grep -q two {} \; -a \   -exec grep -q three {} \; -a -print   But that's definitely not the direction I'm going here. I want something that requires less typing, and possibly just one call to grep, awk, perl or similar.  For example, I like how , like:  awk '/one/ && /two/ && /three/' *   Or, print just the file names:  awk '/one/ && /two/ && /three/ { print FILENAME ; nextfile }' *   But I want to find files where the keywords may be anywhere in the file, not necessarily on the same line.    Preferred solutions would be gzip friendly, for example grep has the zgrep variant that works on compressed files. Why I mention this, is that some solutions may not work well given this constraint. For example, in the awk example of printing matching files, you can't just do:  zcat * | awk '/pattern/ {print FILENAME; nextfile}'   You need to significantly change the command, to something like:  for f in *; do zcat $f | awk -v F=$f '/pattern/ { print F; nextfile }'; done   So, because of the constraint, you need to call awk many times, even though you could do it only once with uncompressed files. And certainly, it would be nicer to just do zawk '/pattern/ {print FILENAME; nextfile}' * and get the same effect, so I would prefer solutions that allow this.


I have tried to find out -out there- a good technical reason for defining a class which contains only one member and this member happens to be a operator().  I stumbled upon someone who -for whatever the reason- created a namespace containing a couple of classes, but each class contains only one operator() as a member.  It is clear to me that these classes might then be used as if they were methods (very likely), but why is this a good technical approach (I assume there is a good one), rather than simply defining a set of different methods within a singleton class which in this particular case would belong to the namespace I mentioned lines above.  The namespace looks something like:  namespace myNamespace {    class ClassA {    public:       void operator()();    };     class ClassB {    public:       int operator()(arg1, arg2);    };     ... }   Is this simply a matter of personal taste/style or is this the expression of advance/sophisticated design? I assume this design encompass some wise knowledge that I haven't gathered yet, but on the other hand I haven't found a piece of article or question discussing this - which makes me doubt about such "wise knowledge" in the design.  What does the experts here have to say?  Thanks in advance!  EDIT  Hello again! I accept this question to be a REPEATED question, whose answer is found .  The term Functor was unknown to me and while trying to find an answer to my doubt (prior to this question's submission), I did not see any references to this term.  I still accept the answer from SergeyA, because his answer introduced me to the term and his explanation is answering my question. His answer -from my point of view- is extended by the answer found in the link I stated lines above.  Thanks!

I keep hearing a lot about functors in C++. Can someone give me an overview as to what they are and in what cases they would be useful?


I have a pdf that I'd like to insert in my document. When using graphicx or pdfpages the pdf is rendered like this:  In the pdf itself, the drawing are pretty centered.  What can I do to centralize this?

I mess up with things when I try to use the figure-thing: the picture is not appearing with the correct alignment (apparently because I forget the float package). Now I want to use only the graphicx package with \includegraphics. How can I center the \includegraphics without figure?  Not working or doing centering to the document afterwards.  \includegraphics[width=0.5 \textwidth]{./Pictures/r.png}{\centering} \includegraphics[width=0.5 \textwidth]{./Pictures/r.png}\centering


I'm currently trying to typeset the Gell-Mann-Matrices:   \documentclass{article} \usepackage{array} \usepackage{setspace}  \newcommand\matthree[9]{\left(\begin{array}{c c c} #1 & #2 & #3 \\ #4 & #5 & #6 \\ #7 & #8 & #9\end{array}\right)}  \begin{document}  The generators are often written in a standard basis $T^a = \frac{1}{2} \lambda^a$, with $\lambda^a$ being the Gell-Mann-Matrices  \begin{center}   $\lambda^1 = \matthree {0}{1}{}{1}{0}{}{}{}{0}$,   $\lambda^2 = \matthree {0}{-i}{}{i}{0}{}{}{}{0}$,   $\lambda^3 = \matthree {1}{}{}{}{-1}{}{}{}{0}$,   $\lambda^4 = \matthree {0}{}{1}{}{0}{}{1}{}{0}$,   $\lambda^5 = \matthree {0}{}{-i}{}{0}{}{i}{}{0}$,   $\lambda^6 = \matthree {0}{}{}{}{0}{1}{}{1}{0}$,   $\lambda^7 = \matthree {0}{}{}{}{0}{-i}{}{i}{0}$,   $\lambda^8 = \frac{1}{\sqrt{3}} \matthree {1}{}{}{}{1}{}{}{}{-2}$  \end{center}  \end{document}   This already looks fairly reasonable:   However, the line spacing looks a bit too small, so I thought I'd go for  \begin{center}\setstretch{1.5}\par    ... \end{center}     Not quite what I expected. Now, I thought I might be able to fix it like this:  \newcommand\matthree[9]{\begingroup\setstretch{1.0}\left(\begin{array}{c c c} #1 & #2 & #3 \\ #4 & #5 & #6 \\ #7 & #8 & #9\end{array}\right)\endgroup}   But this just turns everything back to where I started. Any suggestions on how I can increase the line spacing without messing with the row spacing in the matrices?  EDIT: This is not a duplicate of , because I actually want to keep the row spacing in a matrix constant while increasing the line spacing of the surrounding text.

I want to reduce the size of the vertical space in matrix environment and have a result something like this     But at present I manage something like below     with the following code    $\begin{bmatrix}     00 & 08 & 10 & 18 & 20 & 28 & 30 & 38 \\     01 & 09 & 11 & 19 & 21 & 29 & 31 & 39 \\     02 & 0a & 12 & 1a & 22 & 2a & 32 & 3a \\     03 & 0b & 13 & 1b & 23 & 2b & 33 & 3b \\     04 & 0c & 14 & 1c & 24 & 2c & 34 & 3c \\     05 & 0d & 15 & 1d & 25 & 2d & 35 & 3d \\     06 & 0e & 16 & 1e & 26 & 2e & 36 & 3e \\     07 & 0f & 17 & 1f & 27 & 2f & 37 & 3f   \end{bmatrix}$   I can change the font using \mathsf{}, but other than that, how I reduce the vertical space between the rows? I did find things like  to increase vertical space between rows in matrix, but not something that can decrease the space.


So, I downvoted someone on SO and commented WHY I did it. His answer was not what the question asked. In my opinion this is how the system works, right? So, directly after that I got 3 downvotes on other answers I posted in other questions. I thought, ok what a stupid.. But, now, the day after, I again got 6-8 downvotes..  What to do about this? It's not that I care loosing rep, it's more like it shouldn't be right to downvote good answers. Here's some examples:   (+9 | -1)   (+9 | -1)   (+7 | -1)    This won't be turned around by the system as it's not seen as serial downvoting.. So my question is: What can you actually do to prevent people like this from downvoting others they don't like? Do you need to flag it for a moderator?

While browsing Stack Overflow, I noticed that I lost a lot of reputation:        Is this serial downvoting? Will it be corrected by a rep-recalculation? How often are those done?    Here's a second instance:


I am experiencing difficulties understanding the concept of convolution and especially convolution of 2 independent indicator functions. I would be really thankful if someone can help understand the intuition behind it. Thank you in advance

I've been wondering about this one for a while; I find it a little weird how abruptly it happens. Basically, why do we need just three uniforms for $Z_n$ to smooth out like it does? And why does the smoothing-out happen so relatively quickly?  $Z_2$:     $Z_3$:    (images shamelessly stolen from John D. Cook's blog: )  Why doesn't it take, say, four uniforms? Or five? Or...?


I'm studying a course on Matroid theory. Sadly, I can't really afford buying the textbook, so I only use the lecture notes, which aren't enough for me.   Are there any good and thorough online and or/free references on Matroid theory?   Thanks in advance for any assistance!

Could you recommend any approachable books/papers/texts about matroids (maybe a chapter from somewhere)? The ideal reference would contain multiple examples, present some intuitions and keep formalism to a necessary minimum.  I would appreciate any hints or appropriate sources.


I am both a citizen of Canada and a citizen of the US (dual citizenship) but I am living in Canada at the moment. I have a US passport and a Social Security Number. Can I open up a bank account in a US bank without living in the US? If so, how might I go about doing this?  Also, I would like to avoid visiting the US to do this if that is at all possible.

I am an American citizen with a social security number, but I'm currently living abroad and am not planning on visiting any time soon, and I don't have any state-issued ID. Is there a bank that will allow me to open up an account online without proving a residential address in the US? I have relatives in the US that I can use their address to receive bank-related mail.  I know this is similar to , but not exactly the same.


Way back in the 90's I watched a movie/cartoon on TV about a boy on an alien planet. He becomes friends with an alien called Willard or Wilbur or Willis or something like that. Towards the end the alien tells the boy it's tired and goes into a hibernation/ metamorphose state. At the end the alien is walking through a house with the boy's grandson(?) and telling him about the original boy. I think the alien was kind of a fluffy blob with tentacle legs. I could be wrong. I'm sorry I can't remember much more than that. I was a little kid and it was just some random movie/cartoon on TV.

I've been trying to find a movie a saw when I was a kid. I don't remember the name, just a few details of the plot.  I remember it was set on Mars, there was a human colony there, like a dome city.  They had a conflict with an alien race that looked like furry humanoids.  The main characters were two kids, a boy and a girl. The girl had an alien pet, a little fur-ball animal.  Eventually they meet the "enemy" alien race and find out that their pet is an infant of that race.  Eventually the aliens help the humans to make the planet completeley habitable for humans, and in the end it is shown that the little pet has grown and is telling the story of the movie to some human kids.  Any idea what I'm talking about or did I make it up in my mind?


Another baffling change/that I notice in him now-a-days/is that he avoids to speak to me.   In this sentence the error is said to be "to speak" is wrong and "speaking" will be used. I am not sure with which grammatical rule speaking should come.

Is it correct to use two present continuous verb successively? For example  I'm avoiding traveling  Or it should be  I'm avoiding to travel


If I have minecraft downloaded on a single pc but I am getting a new computer do I have to buy it again?

I plan on buying a gaming PC as I expect to be able to get it around a year and I currently have a laptop that I play (a pirated version of) minecraft. I heard that minecraft broke out off of the "cringe culture", which convinced me to finally buy it (for now) and later buy the gaming PC, but...  The thing I'm wondering about is, if I buy minecraft on a laptop, will I be able to avoid the whole buying part when I'll get a gaming PC in the future?  Just want to know if I just need to re-download minecraft and log-in on my mojang account or (in the worst case) re-purchase minecraft and log-in on my mojang account...


It seems more and more lately that people on this site dislike subjective questions, as opposed to ones about narrow, technical topics. I don't understand this. I see two reasons as to why subjective questions should be respected:   Understanding multiple points of view on a subject makes you more informed and allows for better decision making. I like to post subjective questions just to understand what the different arguments are. Yes, people argue, but a healthy debate is a good thing and attacking a point of view is not the same as attacking someone personally. They're fun.   Given the above, why does the community seem to hate subjective questions more and more lately?

I'm on SO pretty much every day researching something to do with programming, and over the last month or two, I find I'm growing frustrated and a little disgusted at how many interesting questions have been closed as "not a good fit" or "too subjective".  I think there is a confusion between "subjective" and "calls for judgement". To me one of the most valuable things about SO is the tremendous breadth and depth of experience of the members, and experience translates into smart decisions and advice, and that advice cannot always be asked for, or expressed in terms of, bald facts and data.  It's going to be 'subjective'.  I don't think SO should be Wikipedia. I think that if I could ask a question to a group of skilled programmers sitting around a table at lunch, and get interesting, valuable answers, then I don't care whether the question or the answers are 'subjective', I think that question should equally well be fair game for Stack Overflow.  I would like to see a mechanism whereby people who vote to close a question lose reputation when somebody expresses interest in that question or its responses.  How can I, or can I, influence this aspect of SO?


I was wondering what the difference is between ls > list and ls >> list is and what the purpose of these commands is?

I often see tutorials online that connect various commands with different symbols. For example:  command1 |  command2 command1 &  command2 command1 || command2     command1 && command2   Others seem to be connecting commands to files:  command1  > file1 command1  >> file1   What are these things? What are they called? What do they do? Are there more of them?    .


"That is me." Why is this incorrect and why should we use "that is I" please?  I think we can't say the pronoun "that" can't act as a subject:  That is a keyboard.  Who is she? Here, too, "who" is not considered as the subject apparently! Is its reason the same as above?  What makes her happy?  But here "what" is considered as a subject!  I suppose the issue related to the problem is in the use of "to be" words, in the first two sentences above.  Do you agree?  All answers and comments are warmly welcome, I also would like to see StoneyB's answer. :-)

It is me who am to blame.    It is I who am to blame.      Which one is correct here? I am bewildered about these two sentences.


I just got access to the clothing store in lumios city but everything is so expensive. the shirts are 100,000 and I only have 400,000. how can you earn money I know you can vs the league but are there any other good ways to get money?

What's the most efficient way to farm Pokemon Dollars/money in Pokemon X & Y? I'd love to be able to have a decently sized wallet so I can show it off to others, but mainly to buy tons of Max Repels when venturing through the wild.  I remember how hard it would be in previous Generations.  For example, in Gen V, I remember repeatedly grinding the Elite Four just to make some serious profit, but it took hours of grinding to reach a decently sized wallet.  What's the most efficient way to do so?


I would like to install git but when I type the command:   sudo apt-get install git   I am getting the error:  iiit is not in the sudoers file.  This incident will be reported.   The output of groups is:  iiit adm dialout cdrom dip plugdev lpadmin sambashare

I clean-installed Ubuntu 11.10 today, and then installed VirtualBox.  This required me to add myself to the vboxusers group, and since 11.10 seems to no longer have a graphical app to add users to a group, I ran the following command:  sudo usermod -G vboxusers stephane   This is a problem.  I now see what I should have run instead is:  sudo usermod -aG vboxusers stephane   The end result is I'm no longer in the groups I should be in.  Including whatever group is required to run "sudo".  When I run any command as sudo now, I get the following:  $ sudo ls [sudo] password for stephane:  stephane is not in the sudoers file.  This incident will be reported.   Is there a way to fix this, or do I need to re-install from scratch again?


Two dipoles can form a quadrupole, two quadropoles an octopole. The textbook by Griffith then says ' and so on'. So how would a hexadecapole really look like? My impression was that the construction seems to rely on going to higher and higger dimensions.

We can get monopole $1/r$, dipole $1/r^2$, quadrupole $1/r^3$ and octupole $1/r^4$ potential falloff by placing opposite point charges at the corners of a point, line, square and cube, respectively. My book cryptically says "and so on", how does one get a $1/r^5$ and higher potential falloff with a finite number of point-charges in 3 dimensions?


I'm trying to install Ubuntu 16.04.2 on my desktop computer on a separate hard drive which I bought for this sole purpose. The first hard drive contains windows 10. In order to do so, I formatted the disk via the Ubuntu installer which I have loaded on an USB stick. I followed the following guide (including the optional boot-partition step, I also tried the optional var and tmp-partition):   More specifically, these are the exact options I chose:  Options at the beginning:   Swap partition:   Root:   Home:   Everything together + bootloader:   Perhaps I should mention that at the beginning of everything, when I start the Ubuntu installer from the disk (so before all of these options), I get the following screen briefly before the Ubuntu installer loads:    After installing, when I start up the computer I reach the grub menu. I launch Ubuntu from there, which takes me to a very dark purple screen with nothing on it. After some time, my monitor switches to screen saver. Nothing happens then.  My hardware specs are the following:   Samsung SSD 960 EVO M2 NVIDIA GeForce GTX 1080 Ti AMD Ryzen 7 1700 32 GB RAM ROG CROSSHAIR VI HERO Mainboard   Can someone help me?

I am trying to boot Ubuntu on my computer.  When I boot Ubuntu, it boots to a black screen.  How can I fix this? Table of Contents:


RAM usage is increasing in database server with time. When we restart the SQL services it take around 4 GB but after day or two it increases to 11-12 GB and even further. Application is hosted on separate server. Please suggest what could be the reason.

SQL Server is consuming 87.5 % of my server RAM. This recently caused a lot of performance bottlenecks such as slowness. I researched this issue. One common solution I could find on the internet is to set the maximum limit for SQL Server. This was done and much improvement is gained. I want to know why if the maximum memory value is not set why SQL Server keeps consuming the resources


I wrote the folloing code to test how to change values of class object in a function.  using namespace std;  class test{ public:     int a; };  void runer(test testXX){     testXX.a=10; }  int main() {     test test1;     test1.a=5;     runer(test1);     cout<<test1.a;     return 0; }   When I run the following code the output is 5 and not 10. Is it because I can't change the values of class instances, like I can't change the values of array members without using pointers? I would be grateful if someone could clarify that!

I would like to clarify the differences between by value and by reference.  I drew a picture     So, for passing by value,  a copy of an identical object is created with a different reference, and the local variable is assigned the new reference, so to point to the new copy  How to understand the words: " If the function modifies that value, the modifications appear also within the scope of the calling function for both passing by value and by reference "  Thanks!


aptitude search linux-headers   provides this:  p   linux-headers-3.16.0-4-all      - All header files for Linux 3.16 (meta-pack p   linux-headers-3.16.0-4-all-amd6 - All header files for Linux 3.16 (meta-pack i   linux-headers-3.16.0-4-amd64    - Header files for Linux 3.16.0-4-amd64      i A linux-headers-3.16.0-4-common   - Common header files for Linux 3.16.0-4     p   linux-headers-amd64             - Header files for Linux amd64 configuration   but i need to get 32 bit kernel headers  how to do that with apt?

I have a 64-bit (amd64 a.k.a. x86_64) Debian or Ubuntu installation. I need to run 32-bit (i386/i686) programs occasionally, or to compile programs for a 32-bit system. How can I do this with a minimum of fuss?  Bonus: what if I want to run or test with an older or newer release of the distribution?


Theoretically the force has no association with any hand gesture right? So technically can a force user lift their foot and squeeze their toes to choke someone?

In almost every canon (that is, visual) source, Force users typically wave a hand to invoke the Force to move or manipulate objects, people and thoughts. I get out-of-universe this is a visual cue that the Force is being used, but in-universe is it strictly necessary?  (The only exception I can think of is when Luke is training on Dagobah and is balancing rocks while standing on one hand with Yoda on his foot. He doesn't appear to be waving his hand to move the rocks.)  Is this addressed anywhere in-universe, even in Legends?


I have created this table in SQL database;  index  Reg_No   Payment  Payday 1      S001     100      2017/01/01 2      S001     500      2017/02/01 3      S002     400      2017/01/01 4      S002     1000     2017/11/01   I need to group this by reg_no and also show the latest payment only. So, final result should look like this.  index    Reg_No    Payment    Payday 2        S001      500        2017/02/01 4        S002      1000       2017/11/01   How can I write the SQL query for this.

My table is:     id home datetime player resource     1 10 04/03/2009 john 399   2 11 04/03/2009 juliet 244   5 12 04/03/2009 borat 555   3 10 03/03/2009 john 300   4 11 03/03/2009 juliet 200   6 12 03/03/2009 borat 500   7 13 24/12/2008 borat 600   8 13 01/01/2009 borat 700     I need to select each distinct home holding the maximum value of datetime. Result would be:     id home datetime player resource     1 10 04/03/2009 john 399   2 11 04/03/2009 juliet 244   5 12 04/03/2009 borat 555   8 13 01/01/2009 borat 700     I have tried: -- 1 ..by the MySQL manual:   SELECT DISTINCT   home,   id,   datetime AS dt,   player,   resource FROM topten t1 WHERE datetime = (SELECT   MAX(t2.datetime) FROM topten t2 GROUP BY home) GROUP BY datetime ORDER BY datetime DESC  Doesn't work. Result-set has 130 rows although database holds 187. Result includes some duplicates of home. -- 2 ..join  SELECT   s1.id,   s1.home,   s1.datetime,   s1.player,   s1.resource FROM topten s1 JOIN (SELECT   id,   MAX(datetime) AS dt FROM topten GROUP BY id) AS s2   ON s1.id = s2.id ORDER BY datetime   Nope. Gives all the records. -- 3 ..something exotic:   With various results.


What is the limit of $$\exp(-2n) \sum_{k=1}^{n} \frac{(2n)^k}{k !}$$ as $n \to \infty ?$  I am getting the indeterminate form $0 \times \infty$ by applying limit directly.  I don't find any other way to solve this limit.

I'm supposed to calculate: $$\lim_{n\to\infty} e^{-n} \sum_{k=0}^{n} \frac{n^k}{k!}$$ By using WolframAlpha, I might guess that the limit is $\frac{1}{2}$, which is a pretty interesting and nice result. I wonder in which ways we may approach it.


We have a lightning aura component that we expose to a Customer Community. How can you detect if you are using Chrome Browser on the iPAD?

I need to detect browser type (IE, Chrome, Safari etc.) in the lightning component but navigator.userAgent is not working in lightning.


I am studying for a test and I am given this problem:  $$\lim_{n\to\infty}\frac{n^n}{n!}.$$  How do I go about solving this limit? Intuitively I see how the numerator is growing much faster, but how do I express this precisely? Thanks!

I am trying to check whether or not the sequence $$a_{n} =\left\{\frac{n^n}{n!}\right\}_{n=1}^{\infty}$$ is bounded, convergent and ultimately monotonic (there exists an $N$ such that for all $n\geq N$ the sequence is monotonically increasing or decreasing). However, I'm having a lot of trouble finding a solution that sufficiently satisfies me.  My best argument so far is as follows,  $$a_{n} = \frac{n\cdot n\cdot n\cdot \ldots\cdot n}{n(n-1)(n-2)(n-3)\dots(2)(1)} = \frac{n}{n}\cdot \frac{n}{n-1}\cdot  \ldots \cdot \frac{n}2\cdot n$$  so $\lim a_{n}\rightarrow \infty$ since $n<a_{n}$ for all $n>1$. Since the sequence is divergent, it follows that the function must be ultimately monotonic.  This feels a little dubious to me, I feel like I can form a much better argument than that, or at the very least a more elegant one. I've tried to assume $\{a_{n}\}$ approaches some limit $L$ so there exists some $N$ such that  $|a_{n} - L| < \epsilon$ whenever $n>N$ and derive a contradiction, but this approach got me nowhere.  Finally, I've also tried to use the fact that $\frac{a_{n+1}}{a_n}\rightarrow e$ to help me, but I couldn't find an argument where that fact would be useful.


When i attempted to launch gparted, it crashes and prints follwing on console. any idea to get rid of that?  Thanks in advance!  $ sudo gparted Created symlink /run/systemd/system/-.mount → /dev/null. Created symlink /run/systemd/system/boot-efi.mount → /dev/null. Created symlink /run/systemd/system/home.mount → /dev/null. Created symlink /run/systemd/system/media-supun-Data.mount → /dev/null. Created symlink /run/systemd/system/run-user-1000.mount → /dev/null. Created symlink /run/systemd/system/run-user-121.mount → /dev/null. Created symlink /run/systemd/system/tmp.mount → /dev/null. No protocol specified  (gpartedbin:5820): Gtk-WARNING **: cannot open display: :0 Removed /run/systemd/system/-.mount. Removed /run/systemd/system/boot-efi.mount. Removed /run/systemd/system/home.mount. Removed /run/systemd/system/media-supun-Data.mount. Removed /run/systemd/system/run-user-1000.mount. Removed /run/systemd/system/run-user-121.mount. Removed /run/systemd/system/tmp.mount.

I installed Ubuntu 17.10. Now I am having trouble with gksu:  $ gksu -dg synaptic No ask_pass set, using default! xauth: /tmp/libgksu-HgUjgQ/.Xauthority STARTUP_ID: gksu/synaptic/8760-0-alex-XPS-15-9530_TIME4974977 cmd[0]: /usr/bin/sudo cmd[1]: -H cmd[2]: -S cmd[3]: -p cmd[4]: GNOME_SUDO_PASS cmd[5]: -u cmd[6]: root cmd[7]: -- cmd[8]: synaptic buffer: -GNOME_SUDO_PASS- brute force GNOME_SUDO_PASS ended... Yeah, we're in... Unable to init server: Could not connect: Connection refused (synaptic:8767): Gtk-WARNING **: cannot open display: :1 xauth: /tmp/libgksu-HgUjgQ/.Xauthority xauth_env: (null) dir: /tmp/libgksu-HgUjgQ   If I don't use -g, the password dialog is disabled. So looks like a problem with creating a tty for root.  Any advice?


Let $I\subset\mathbb{R}$ be an interval and let $(f_n)$ be a sequence of continuous real-valued functions on $I$. Consider the following statements:   $f_n\to f$ uniformly; For every sequence $(x_n)$ in $I$ converging to $x\in I$, we have $f_n(x_n)\to f(x)$; $f:\ I\longrightarrow\mathbb{R}$ is continuous.   Certainly (1) implies (2) and (3). If $I$ is compact, (2) and (3) together imply (1), otherwise counterexamples can be found.  My interest is on the relationship between (2) and (3), specifically does (2) imply (3)? My intuition says no, since (2) would appear to be a strictly weaker statement than (1). However, (2) is certainly stronger than pointwise convergence of $(f_n)$, and so far I have been unable to think of a counterexample. Can anyone think of a counterexample (or proof)

From Pugh's analysis book, prelim problem 57 from Chapter 4:     Let $f$ and $f_n$ be functions from $\Bbb R$ to $\Bbb R$. Assume that $f_n(x_n)\to f(x)$ as $n\to\infty$ whenever $x_n\to x$. Prove that $f$ is continuous. (Note: the functions $f_n$ are not assumed to be continuous.)   here's my attempt: assume $x_n \to x$. we want to show that $f(x_n) \to f(x)$. so $|f(x_n) - f(x)| \leq |f(x_n)-f_n(x_n)| + |f_n(x_n)-f(x)|$. The second term can be made to be less than any $\varepsilon > 0$ for $n$ sufficiently large. i'm having trouble with the first term. can anyone help? thank you!


I would like to know, when comparing string in C#? which method is suitable to use and why?  CompareTo() or Equals()?

Comparing string in C# is pretty simple.  In fact there are several ways to do it.  I have listed some in the block below.  What I am curious about are the differences between them and when one should be used over the others?  Should one be avoided at all costs?  Are there more I haven't listed?    string testString = "Test"; string anotherString = "Another";  if (testString.CompareTo(anotherString) == 0) {} if (testString.Equals(anotherString)) {} if (testString == anotherString) {}   (Note: I am looking for equality in this example, not less than or greater than but feel free to comment on that as well)


How can I include HTML code in my Gmail signature?

Is there any way to add HTML markup signature in Gmail settings? I mean, insert some HTML markup without using rich editor, just inserting HTML?


I only have one tab open and six chrome.exe running. I have not added any plug-ins and have no extensions. There are no videos trying to play or sound on web page so six exe processes seem like a lot especially when I opened Chrome and landed here before going anywhere else. I've read several post and this still seems to be overkill even given the explanations I've seen so far.  I am utilizing Chrome 59.0.3071.29 (Official Build) beta (64-bit) on a Windows 7 Professional SP1 machine.  Is this normal because performance has became an issue lately?

I know that each new tab on Google Chrome have its own process, but I have 14 chrome.exe processes running actually as I can see it on the Task Manager, and only two tabs are opened on Google Chrome.    Could it be due to Chrome extensions? What other reason can open more chrome.exe process and how to avoid it?


We all know that the lagrangian for the free electromagnetic field is given by $$ \mathscr{L} = -\frac{1}{4}F^{\mu \nu}F_{\mu \nu} $$ where $ F^{\mu \nu} = \partial^\mu A^\nu -\partial^\nu A^\mu $ is the . But also we know that     Lets consider $c=1$ for simplicity. Then, doing the math, the lagrangian can be written as $$ \mathscr{L} = \frac{1}{2} (|\vec{E}|^2 - |\vec{B}|^2) $$   By applying , i.e. $$ \partial_\mu \left( \frac{\partial \mathscr{L}}{\partial (\partial_\mu \phi_i)} \right) - \frac{\partial \mathscr{L}}{\partial \phi_i} = 0 $$  where $\phi_i$ is each of the components of each field, I find $$ \vec{E} = 0 $$ and $$ \vec{B} = 0 $$ but not the Maxwell equations... What is going on?

Is it possible to formulate classical electrodynamics (in the sense of deriving Maxwell's equations) from a least-action principle, without the use of potentials? That is, is there a lagrangian which depends only on the electric and magnetic fields and which will have Maxwell's equations as its Euler-Lagrange equations?


Let $\Omega$ be a bounded domain in $\mathbb{R}^{n}$, $n\geq 3$ and $x_{0}\in\Omega$. Suppose $u$ is harmonic in $\Omega\backslash\left\{ x_{0}\right\}  $ and $$ \lim_{x\rightarrow x_{0}}\left\vert x-x_{0}\right\vert ^{n-2}u\left( x\right)  =0, $$ Show that $$ \lim_{x\rightarrow x_{0}}u\left(  x\right) $$ exists and $u$ is harmonic in $\Omega$ if we define $u\left(  x_{0}\right) =\lim_{x\rightarrow x_{0}}u\left(  x\right)  $. I am thinking to use MVP at $x_0$ to show harmonicity but I am not getting any clue because showing limit exists is itself challenging. I can argue that $$ \lim_{x\rightarrow x_{0}}u\left(  x\right)\neq \infty $$ as the function is bounded by the values on $\partial \Omega$ and $\partial B(x_0,\delta)$ for some small $\delta>0$.

There seems to be a removable singularity theorem for harmonic functions that somewhat goes like:     Let $\Omega\subset \Bbb R^n$ be an open region and $x_0\in\Omega$, $u$ is harmonic in $\Omega-\{x_0\}$. Now if we have $u(x)=o(\Phi(x-x_0))$ around $x_0$ then there exists $\tilde u$ harmonic in all of $\Omega$ and $u=\tilde u$ in $\Omega-\{x_0\}$.    Here $\Phi$ is the fundamental solution to $\Delta u=0$ in $\Bbb R^n$, and, since dropping the normalising constant doesn't affect our statement above, you may just take $\Phi=-\log|x-x_0|$ in 2D and $=1/|x-x_0|^{n-2}$ in 3D or higher.   I have two questions concerning this theorem:  1). I can't find a satisfactory proof. So far I only found , which however doesn't look okay to me because there seems to be an abuse of $\epsilon-\delta$ language: when the author concluded the proof by letting $\epsilon\to 0$, he seemed to forget the previous part of his proof depended on $\delta$ which depended on $\epsilon$. So is there any other available proof?  2). I think the statement of the theorem is unnecessarily complicated. If $x_0$ is really removable for $u$, then I think it's necessary $u$ is bounded around $x_0$. And then boundedness clearly implies the condition that $u(x)=o(\Phi(x-x_0))$. So why not just say "if $u$ is bounded around $x_0$ then it's a removable singularity"? Why all the fuss about comparing $u$ against $\Phi$?


The company halted, and there was not a heart among them that did not quail, unless it were the heart of Legolas of the Elves, for whom the ghosts of Men have no terror.   Given Elladan and Elrohir were in the company, are they fearful of the shades of men or am I reading to much into the passage?

In Rohan, Aragorn was joined by some of his kinsmen, Rangers from the north. With them were the two sons of Elrond Half-Elven:     ‘I have thirty with me,’ said Halbrad. ‘That is all of our kindred that could be gathered in haste; but the brethren Elladan and Elrohir have ridden with us, desiring to go to the war.’   Two nights later, Aragorn led this company, plus Legolas and Gimli, through the door to the Paths of the Dead, a dread place:     The company halted, and there was not a heart among them that did not quail, unless it were the heart of Legolas of the Elves, for whom the ghosts of Men have no terror.   The sons of Elrond haven’t gone missing. Elladan at least is still there:     Aragorn had brought torches from Dunharrow, and now he went ahead bearing one aloft; and Elladan with another went at the rear.   Either there is something deeply subtle about the nature of Elladan and Elrohir, or Tolkien made a mistake. Which is it?  All quotes from Book Five, Chapter II, “The Passing of the Grey Company”.


Can anyone tell me what this command means?  I've seen it in a tutorial but can't get it well. find . -type f | xargs file

I know the grep command and I am learning about the functionalities of xargs, so I read through  page which gives some examples on how to use the xargs command.   I am confused by the last example, example 10. It says "The xargs command executes the grep command to find all the files (among the files provided by find command) that contained a string ‘stdlib.h’"  $ find . -name '*.c' | xargs grep 'stdlib.h' ./tgsthreads.c:#include ./valgrind.c:#include ./direntry.c:#include ./xvirus.c:#include ./temp.c:#include ... ... ...   However, what is the difference to simply using   $ find . -name '*.c' | grep 'stdlib.h'   ?  Obviously, I am still struggling with what exactly xargs is doing, so any help is appreciated!


I am wondering why do we use scaling on train and test set separately. I understand that transform () on test data  μ and σ as computed from fit_transform() on  Train. But why can we compute μ and σ from all given data (before split) and then apply them on future data.   Do we do this because we don't know how the size of our future data?

Assume that we have a training data set (with both features and labels) and a test data set (with only features).   When we build a machine learning model that requires normalization of the features, the correct way of doing normalization (to prevent information leakage) is to only use the training data set. Namely, a wrong way of doing normalization is to stack the training (exclude the Y column) and test data set together, and perform normalization (i.e., using the mean and variance of the entire training + test data set). The intuition here is very clear: if you want to get an unbiased estimator of your model performance in production, then when you train your model, you shouldn't instill any information in the test data set that will be used to gauge the actual performance of your model.  My question is the following: When we have trained the model correctly and about to use this model to do prediction, how should we normalize the test data set? I believe the correct way to normalize the test data set is: using the mean and variance obtained from the training data set to do normalization on the test data set.  However, why not just normalize the test data using its own mean and variance? Or why not stack train and test data set together and using the overall mean and variance to normalize the test data set? In the prediction stage, the idea and intuition of data snooping and information leakage is not clear to me.


Find the value of   $\displaystyle \lim_{n \to \infty} \int_{0}^{1} nx^n e^{x^2}dx$ I am trying to solve this by using uniform convergence rule for integration but getting nothing , i have solved questions with negative exponential ,because it is easy to find their uniform convergence ,but here i am not getting any idea how to solve this, please  give me a hint so that i can try it myself, Thank you.

The value of $\lim_{n \to \infty}\int_{0}^{1}nx^ne^{x^2}dx$ is _____ I tried by taking the odd $n$ values as in that case, the integral I suppose was easier to calculate. So, denote $I_n=n\int_{0}^{1}e^{x^2}x^ndx$, then we have : $I_1=\frac{e-1}{2},\\I_3=\frac{3}{2},\\I_5=5(\frac{e}{2}-1),\\I_7=7(3-e)$ Then I tried calculating (random) values using calculator as integration was getting cumbersome. $I_{31}=2.488$, $I_{51}=2.57$. I do not see any kind of recurrence so that I can find a general term for odd $n$. I also tried the method given . The idea was that since integral doesn't depend on $n$ considering $I(n)=\int_{0}^{1}e^{x^2}x^ndx$, then $I'(n)=\int_{0}^{1}x^n\ln(x)e^{x^2}dx$, but this also doesn't lead me to any conclusion as well. I believe I couldn't get to a proper approach to tackle this question. Can someone please help with the idea that involves in solving these type of questions?


Does anybody know how to draw the Pi Model    in latex ?   I was thinking about using the tikz package but as I am new to latex I do not really know where to begin.

What packages do you use and recommend for creating graphics in your LaTeX documents?     As this is a community wiki post, please add your package to the accepted answer (or add a comment, and someone with >100 rep will add it to the CW answer), and include a brief description of what differentiates it from others and how it can be used (GUI drawing tool which generates code, type in raw text, or generates image for inclusion in document).   We'll eventually sort these answers under headings.


Hybrid- and Microkernels are flexible, in the way one can add any higher-level functionality as a module, is it not the same for linux kernels? Why then linux is called a monolithic?

I read once that one advantage of a microkernel architecture is that you can stop/start essential services like networking and filesystems, without needing to restart the whole system. But considering that Linux kernel nowadays (was it always the case?) offers the option to use modules to achieve the same effect, what are the (remaining) advantages of a microkernel?


I am considering buying my first DLSR and found the D3200. It appeals to me because of the high MP count, 1080p video shooting and low price. It also seems to do very well on this site: . I have a pretty low budget < $600 and want to make sure I am getting the most "bang for my buck". Here are the things am I trying to consider while making this decision:   Is the camera cost effective? Will it be compatible with most Nikon lenses? Will it be a good platform for me to learn and grown in photograph?   So my question: Is the D3200 optimal for my situation?

I am thinking of buying a digital SLR camera. What things should I be looking for?


Every fortnight, on a schedule, I disconnect the charger from my laptop (which is largely stationary anyway) and let the battery run down.  As soon as I disconnected the battery earlier today, I noticed that I could hear a radio station playing through my speakers at a low volume (say, about 1).  Obviously, I was surprised, because I can positively guarantee that I don't have any music or radio programmes playing in the background (or foreground).  When I plug in the power supply, the low volume playback goes away, but as soon as the laptop begins to run on battery, the radio station becomes audible.  I cannot find any suspicious programmes.  The virus checker has completed its scan and not reported anything.  What could be causing this strange phenomenon?  And should I be worried?    P.S. Not that it makes a difference, but the scheduler is actually set on a monthly schedule.  I just felt like using the word "fortnight."  The rest of the posting is true.

There is a radio station that intermittently plays through my headphones when they are plugged in. It does not play through the stereo speakers of my laptop.   When I open the volume mixer, it does not show any sound being played, even though there is sound coming through my headphones.   The sound does not get louder or quieter when I change the volume.   I have closed all browsers, and the sound still comes through.   How can I find a list of all programs that are outputting sound?


My jQuery works great on the initial load of my Bootstrap Table. However, after paging forward or back it stops working even though the elements haven't changed and haven't been removed. Why?  Here is my jQuery  $(document).ready(function() {   $(function(){     $(".fresh-credit-update-button").click(function(){       console.log("clicking");       var customerId = $(this).parent().siblings(".fresh-credit-update-data").attr('id');       var customerCreditUpdateField = $(this).parent().siblings(".fresh-credit-update-data");       var customerCreditUpdate = customerCreditUpdateField.html('value').val();       $.ajax({           url: "/customers/update",           data: {id: customerId, credit_amount: customerCreditUpdate},           type: "POST",           dataType: "json",           complete: function(data) {             console.log(data.responseJSON.credit_amount);             customerCreditUpdateField.val("$" + data.responseJSON.credit_amount);           },       }); //ajax     }); // button click   }); // 2nd function }); // document ready   And then here is the table its watching
 <% @all_customers.each do |individual| %>
         	         <%= "#{individual.first_name} #{individual.last_name}" %>
             <input type="text" id="<%= individual.id %>" class="fresh-credit-update-data form-control small-field" value=<%= number_to_currency(individual.credit_amount) %>>                            <button class="btn btn-med fresh-credit-update-button" type="button">Update</button>
         	         <%= number_to_currency(individual.pending_credit_amount) %>	         <%= individual.email %>	         <%= individual.accepts_marketing %>	         <%= individual.customer_status  %>	         <%= individual.tags  %>
 <% end %>

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.


for the past 2 years atleast, i have been trying to remember the name of a book i read while in high school (so 04-08).  Sadly i have the memory of a goldfish, i can remember the setting and some things that took place, but no names etc.  Starting of the book is about a group of scientists that found a "hole" in our dimension. However you couldnt see it unless you stood at a certain angle and looked a certain way. They tried sending several scientists through, however all that came back were mentally broken and completely useless. They had the idea, that it is possible the"change" is so big that an older mind could not handle it. So they sent a genius girl (i THINK she was 13-16 at this point) since younger minds can adapt better.   After she goes through she thinks to her self about all the things "wrong" like how her body was in multiple pieces/places, normal thought to move parts did not work as we knew, hands felt purple (felt not looked) and after analyzing things she determined it was much to great a thing to allow those scientists to continue, so she played that it broke her mind as well. Now after having been through the "hole" she can go into it anywhere anytime.  Obviously it continues a lot, i could ramble on, later she ends up as an adult, scientists are at it again, and end up damaging the dimension walls as they use that hole for resource transportation from mars.  Anyone have any idea? lol

In the 1960s I read book--an older children's book, I think--which I loved, and still remember, roughly.  I have no idea what the title is or who the author is, and I'm wondering if anyone knows this one:  Scientists had invented a device which they didn't fully understand, and which had puzzling effects.  For example, when a pencil was put into the machine, it disappeared, and then reappeared inside out: The lead was on the outside.  When people went into the machine, they came back dead, having died from fright.  Finally they sent a very open-minded person into the machine.  She was an artist, I think.  She was able to return alive, and described an alternate universe in which geometry was very different.  I distinctly remember that there were supposedly square triangles or four-sided triangles--or was it three-sided squares?  (This is, of course, a literally contradictory claim, but I didn't see the matter as clearly then.)  Thanks!


Whilst reading I came across the strange claim that multiplicative inverses exist for only prime values of $n$ in $Z_n$. I am a little puzzled as contrary to that, I know that additive inverses exist for all values of $n$. What would be an approachable proof of the above result?  Thanks in advance.

I need help with this:  If a is an element of $\mathbb Z_n$ and $\gcd(a,n) > 1$ , then a is not invertible.   First you show that if $a$ is an element of $\mathbb Z_n$ and $\gcd(a,n)>1$, then there  is an element $b$ of $\mathbb Z_n$ and ($b$ is not equal to the zero element) from which $ab = 0$.   The second part I cant get. i.e. show if $b$ is not the zero element  and $ab=0$ then $a$ is not invertible.


Let $X_i\sim\mathrm{Uniform}(0,\theta)$ be iid, what is $E[\max\{X_1,\ldots,X_n\}]$? Apparently the answer is $$\frac{n}{n+1}\theta,$$ but I do not see why?  It seems intuitive in that you would "expect" them to be spaced out evenly, hence the maximum would be $\frac{n}{n+1}$-of-the-way along the interval, but how can we prove this mathematically? I feel like it should be simple, but evidently $$E[\max\{X_1,\ldots,X_n\}]\neq\max\{E[X_1],\ldots,E[X_n]\}.$$ Thanks.

Let $ x_i $ be iid observations in a sample from a uniform distribution over $ \left[ 0, \theta \right] $.  Now I need to estimate $ \theta $ based on $N$ observations and I want the estimator to be unbiased.  I thought about simple estimator $ \hat{\theta} = \max \left( x_i \right) $.  Based on simulation it is not biased, yet I couldn't show it analytically.  Could anyone, please, show it is unbiased?  BTW, I could easily find another, easy to prove, unbiased estimator, $ \hat{\theta} = 2 \mathrm{mean} \left( {x}_{i} \right) $


I am using Ubuntu 18.04 and I am experiencing a problem when I attempt to open the Gnome-Terminal.  The error message is:  Failed to launch "Terminal" Failed to execute child process "gnome-terminal" (No such file or directory)   See also attached creenshot below:

How to solve the error "failed to launch Terminal" failed to execute child process￼ GNOME-Terminal ( No such file or directory ) ? Please HELP us to solve this error. Currently I have upgraded Python to 3.7 version.   I have tried opening by clicking Alt+F2 and entered "gnome-terminal" but that too failed.  I tried "sudo apt-get purge gnome-terminal" in a shell opened on clicking "Ctrl + Alt + F3" keys which removed my terminal from the system   And then ran "sudo apt-get install gnome-terminal", I got terminal back but with the same error.


After a race, at least a Grand Prix race, you can hit x to star the race. What's unclear is what that does.

In the top left corner of the post-race menu, there is a prompt to press + to add (or remove) one star out of six. What do these stars do?


I have Ubuntu 14.04 and I want to install Windows 8 along side it. But I can't boot from any live CD or pendrive. My laptop goes into network boot and says- insert proper boot device and press any key.  My laptop is Asus x54c.

I have Ubuntu on my laptop. Now I want install Windows 7 in a dual-boot. How can I do this? I can't lose my Ubuntu files, and I'm afraid that I might break . Go  for UEFI only!


I want child record id with associated parent record id (e.g parent id=a8u540000004CWVAA3). I need all the associated child record ids given that parent Id  SELECT Name,id, (SELECT ID FROM CHILD OBJECT__R)  FROM parent object__c  where id IN ('a8u540000004CWVAA3','a8u540000004CWBBC4')

I write a sample query to fetch account Ids from cases of a particular record type.Then i wrote another sample query parent to child relationship to fetch opportunity ids from accounts.  My sample code  List<Case> c=new List<Case>(); c=[Select Id,accountId from case where RecordTypeId = '01290000000sF3L']; List<Id> accountIds= new List<Id>(); List<Account> accounts=new List<Account>(); List<Opportunity> opps=new List<Opportunity>(); for(Case cl:c)  { accountIds.add(cl.accountId); } accounts=[Select Id,name,(select Id,name from opportunities) from account        where Id in:accountIds]; System.debug('Data in accounts '+accounts);   But my issue is how to get opportunity id from above Soql accounts means how to add those opportunity id's to the list.  for(Account ao:accounts) { //How to fetch Opportunity ids from above account list. }


This question is about finding a matrix description of a specific circuit. I am learning quantum computing through edX's Quantum Information Science lecture series. The question below is the one I am stuck on  Could someone please explain a systematic way to go about finding the matrix representation of a 2-qubit circuit (so that I can apply it to this)

If a circuit takes more than one qubit as its input and has quantum gates which take different numbers of qubits as their input, how would we interpret this circuit as a matrix?  Here is a toy example:


I would like that my references for which I use apsrev show the title of the article. I've found  apsrev-title.bst file that should allow me to do so. But this doesn't work :\   I've downloaded this .bst style, put it in revtex folder where .bst files are, but I get the error  I couldn't open style file apsrev-title.bst ---line 38 of file diplomski.aux  : \bibstyle{apsrev-title  :                       } I'm skipping whatever remains of this command I found no style file---while reading file diplomski.aux   So what am I doing wrong? How to implement this? I also looked at .diff file but I don't know what to do with it.  Any help will be appreciated :)

How can I install a package that doesn't exist in my MikTeX 2.9 package manager? I have downloaded it from CTAN and then created a folder named ucharclasses that contains the ucharclasses.sty and ucharclasses.tex at the path MikTeX → tex → latex.  However I still get the error ucharclasses.sty not found. I am a Windows user and I use MikTeX 2.9 and TexWorks, if that has any importance.


I'm trying to pass a text field from an activity to a fragment, using this code:  EditText textPlayer1;  public void goToSinglePlayer() {     Intent intent = new Intent(this, ActivitySinglePlayer.class);     String player1Name = textPlayer1.getText().toString();     Bundle bundle = new Bundle();     bundle.putString(player1Name, "player1Name");     intent.putExtras(bundle);     startActivity(intent); }   I want a player to enter the text, and then pass the name to the fragment. When I recieve the bundle, I have this code:     public SinglePlayerGameFragment() {     // Required empty public constructor }  @Override public void onCreate(@Nullable Bundle savedInstanceState) {     super.onCreate(savedInstanceState); }  @Override public View onCreateView         (LayoutInflater inflater,          ViewGroup container,          Bundle savedInstanceState) {     View view = inflater.inflate(R.layout.fragment_single_player_game, container, false);     TextView player1Name = view.findViewById(R.id.player1Name);     String name = (getActivity().getIntent().getExtras().getString("player1Name"));     player1Name.setText(name);     return view; }   This gives me the error:  Caused by: android.view.InflateException: Binary XML file line #13: Binary XML file line #13: Error inflating class fragment                Caused by: android.view.InflateException: Binary XML file line #13: Error inflating class fragment                Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference   I've been racking my brain trying to figure this one out, but I'm stuck. Anyone have an idea?  Thank you in advance.

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?


In one of my recent D&D sessions, one of the members of the party (rogue) tamed a wild turkey. Since then, the rest of us have wanted a companion/pet as well (ex: Blood Hawk, Bat, etc.). Are there certain rules for animal-taming? Or is it completely up to the DM? Because with the turkey, they tamed it in one roll.   Please note that none of us are Rangers or beast-masters.   And we are playing in Adventurers League (the DM usually decides whether to use a rule or not).

I'm fairly new to DMing and so is my group, so we are all on a learning curve together. We're playing D&D 5e.  Last week a fighter in our group tamed a wolf with Animal Handling and then requested that he keep the wolf. I allowed this, but now I'm not sure about how to play the wolf.  Specifically, how can he train the wolf to perform certain actions such as attacking?  What other things might I need to be aware of with a PC owning a "pet"?