From: Jason Lillywhite <jason.lillywhite@...>
Date: 2009-05-08T23:39:56+09:00
Subject: Re: using the GSL library

]
> 
> 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.

Thank you.

I see that GSL methods must take only GSL::Vectors as arguments rather 
than 'matrix' Vectors:

irb(main):032:0> a = [1,5,7,2]
=> [1, 5, 7, 2]
irb(main):033:0> v1 = GSL::Vector.alloc(a)
=> GSL::Vector
[ 1.000e+00 5.000e+00 7.000e+00 2.000e+00 ]
irb(main):034:0> v2 = Vector.elements(a)
=> Vector[1, 5, 7, 2]
irb(main):035:0> GSL::Stats::mean(v1)
=> 3.75
irb(main):036:0> GSL::Stats::mean(v2)
TypeError: wrong argument type Vector
  from (irb):36:in `mean'
  from (irb):36

It seems a little odd that we have two kinds of vectors but they are 
both a 'vector'
-- 
Posted via http://www.ruby-forum.com/.