From: rgilaard@...
Date: 2005-05-10T23:59:00+09:00
Subject: Re: help with reading part of textfile into matrix

Oof course I am confused a s a ruby newbie!!

However,
I've made this out of your post:
matrix = []

DATA = File.new("testfile.txt", "r")
DATA.each do | line |
if /^((?:\s+(?:\d+))+)/ =~ line
matrix << $1.split.map{|value| value.to_i}
end
end

p matrix
puts matrix[2,2]
DATA.close

But this gives me as result 
707
293
441

while I would expect 441.

What is going on?

Brgds
Robert

Quoting Brian Schr�der <ruby.brian@gmail.com>:

> On 10/05/05, rgilaard@few.vu.nl <rgilaard@few.vu.nl> wrote:
> > Dear all,
> > 
> > I am new to Ruby and I'm looking for a way to use Ruby (1.8) to read a part
> of
> > a textfile into a matrix.
> > 
> > The textfile lokks like:
> > 
> > === Confusion Matrix ===
> > 
> >      a     b     c   <-- classified as
> >   7494  4044   100 |     a = WEL
> >   2039 18691    11 |     b = NIET
> >    707   293   441 |     c = NOOIT
> > 
> > So what i want is that this matrix is read into a matrix variable in a
> ruby
> > program which I can use then to manipulate in every way I want.
> > 
> > Can someone help me with this?
> > 
> > I figured out that I could maybe use a regexp /\s*a\s*/ to search for the
> line
> > with a b c
> > Then I skip that line and start to read the following line position by
> position
> > into the first row of the 3-by-3 matrix.
> > 
> > How could this be done?
> > 
> > Thanks in advance,
> > Robert Gilaard
> > 
> 
> Confused? ;-)
> 
> $ cat confusion.rb 
> matrix = []
> 
> DATA.each do | line |
>   if /^((?:\s+(?:\d+))+)/ =~ line
>     matrix << $1.split.map{|value| value.to_i}
>   end
> end
> 
> p matrix
> 
> __END__
>      a     b     c   <-- classified as
>  7494  4044   100 |     a = WEL
>  2039 18691    11 |     b = NIET
>   707   293   441 |     c = NOOIT
> 
> $ ruby confusion.rb 
> [[7494, 4044, 100], [2039, 18691, 11], [707, 293, 441]]
> 
> regards,
> 
> Brian Schr�der
> 
> -- 
> http://ruby.brian-schroeder.de/
> 
> multilingual _non rails_ ruby based vocabulary trainer:
> http://www.vocabulaire.org/ | http://www.gloser.org/ |
> http://www.vokabeln.net/
> 
>