From: Cameron McBride <cameron.mcbride@...>
Date: 2009-05-08T14:11:30+09:00
Subject: Re: using the GSL library

On Thu, May 7, 2009 at 22:59, Jason Lillywhite
<jason.lillywhite@gmail.com> wrote:
> I'm trying to get started with the gsl-ruby library - thought I'd start
> with calculating mean of an array. I'm following the example on
> http://rb-gsl.rubyforge.org/stats.html. But I run into this:
>
> require("gsl")
> => true
> irb(main):002:0> v = Vector[1..7]
> NameError: uninitialized constant Vector from (irb):2

I forget exactly when it happened, but the GSL namespace isn't loaded
by default in the newer versions of the library.  This is a good
thing.

Your example will work if you type:
v = GSL::Vector[1..7]

if you really want the short versions, just type
include GSL


> Isn't Vector in the core?... so I did this
>
> irb(main):003:0> require 'matrix'
> => true
> irb(main):004:0> v = Vector[1..7]
> => Vector[1..7]

be careful here.  What you just did was load the std library 'matrix'
library, which also defined a Vector constructor - but no method
called 'mean' This is very different than GSL.

Cameron