From: Robert Klemme <bob.news@...>
Date: 2003-04-25T19:18:40+09:00
Subject: Re: parsing large file into matrix


"Jim Freeze" <jim@freeze.org> schrieb im Newsbeitrag
news:20030425002319.A47026@freeze.org...
> On Thursday, 24 April 2003 at 19:08:17 +0900, Robert Klemme wrote:
> >
> > matrix = File.open("file.txt") do |f|
> >   f.collect do |line|
> >     line.chomp.split("\t").map {|s|s.to_f}
> -----------------------^^^^
>                        /\t/ is faster
> >   end
> > end
>
>  Here's a common scenario that I use.
>  This file allows comments that start with '#'.
>  All other lines that are not empty are data.
>
>  def to_number(str)
>    Integer(str) rescue Float(str) rescue str
>  end
>
>  matrix = []
>  File.foreach(file) { |line|
>   next if /^\s*$/ =~ line
>   next if /^\s*#/ =~ line
>   matrix << line.strip.split(/\t/).collect { |i| to_number(i) }
>  }

next if /^\s*(#.*)?$/ =~ line

sorry, couldn't resist. :-)

    robert