From: "v.srikrishnan@..." <v.srikrishnan@...>
Date: 2006-09-12T02:15:32+09:00
Subject: Re: Matrix

Thanks everyone. I had seen the same answers in the post i mentioned
(2-3 yrs now i think). i was wondering why these small things had not
been added. In my humble opinion having these small things in the basic
Matrix class would be helpful to beginners. I do not say that the basic
class should have numerical stuff like SVD, LU decomposition or other
linear algebra stuff etc. but these things would help. Also,if someone
wants to "freeze" a matrix i think ruby has an operation for it(am
learning ruby).

Thanks again
krishnan
Paul Lutus wrote:
> v.srikrishnan@gmail.com wrote:
>
> > Hi all,
> > a) Is there a way to create a non-square matrix in ruby?
>
> Another poster has answered this one.
>
> > b) How does one set any arbitrary element of an array?
>
> Like this:
>
> -------------------------------------------
>
> #! /usr/bin/ruby
>
> size = 9
>
> # create, preset value
>
> array = Array.new(size) { Array.new(size) {"."} }
>
> # change one value
>
> array[4][4] = '*'
>
> # show it
>
> array.each do |b|
>    b.each do |i|
>       print b[i]
>    end
>    puts ""
> end
>
> Output:
>
> .........
> .........
> .........
> .........
> ....*....
> .........
> .........
> .........
> .........
> 
> -- 
> Paul Lutus
> http://www.arachnoid.com