From: Jim Freeze <jim@...>
Date: 2003-04-25T13:14:41+09:00
Subject: Re: parsing large file into matrix

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) }
 }

-- 
Jim Freeze
----------
"It's Fabulous!  We haven't seen anything like it in the last half an
hour!"
		-- Macy's