How to Install Octave in El Capitan? The new GNU Octave 4.0.1 was released March 23, 2016. 
I would like to find some standard way to install it in El Capitan (mine OS X 10.11.3) because it has significantly better support in some functions than Matlab, discussed in the thread here. 
I do brew search octave and get

homebrew/science/octave    Caskroom/cask/octave       Caskroom/cask/xoctave    


where one of the first two should be a correct one.
The project's homepage support for OS X is down here about installing Octave on OS X systems. 
There is also ruby's way of installing Octave described in the thread How to install Octave on OS X (Yosemite) but for Yosemite. 
I would like to find some standard way of getting Octave for OS X. 

I do successfully brew update and brew upgrade before the commands.
My Homebrew is 0.9.5 (git revision 80d1; last commit 2016-03-24). 
user1256923. I run brew info octave but I get

Error: No available formula with the name "octave"




How can you install Octave in some standard way for El Capitan?
From my homebrew:

brew info octave
homebrew/science/octave: stable 4.0.0 (bottled), HEAD
high-level interpreted language for numerical computing  
https://www.gnu.org/software/octave/index.html
Not installed


and

brew cask info octave
octave: 3.8.2-1
Octave
https://gnu.org/software/octave/
Not installed


xoctave is a gui which I suspect is independent.  I'd use homebrew for the installation.

FWIW the Octave wiki it explains what to do:

brew tap homebrew/science
brew update &amp;&amp; brew upgrade --all
brew install octave