From: Simon Strandgaard <neoneye@...>
Date: 2004-03-11T06:29:42+09:00
Subject: Re: Novice question, tranlate awk code to ruby code

On Wed, 10 Mar 2004 16:04:21 -0300, Horacio Castellini wrote:
>     I'm a novice ruby user, but ancient user in Linux world. We assume
> have a data file with two data field in two columns. In awk program when I
> like time them a script code may be:
> 
> {
>     print $1*$2
> }
> 
> for example I can use "% cat foo.dat|awk -f times.awk" d'accorde. Well,
> how can I do this in ruby code?
> 




Of cause this could be simplified a lot.. but here is a 
simplistic solution.

Is this what you want ?


BTW: welcome to ruby ;-)

--
Simon Strandgaard



server> ruby a.rb
1
2
3
2
4
6
3
6
9
4
8
12
server> expand -t2 a.rb 
# create a dummy data file
File.open("data", "w+") do |file| 
  file.write <<-DATA.gsub(/^\s+/, "")
  1 1
  1 2
  1 3
  2 1
  2 2
  2 3
  3 1
  3 2
  3 3
  4 1
  4 2
  4 3
  DATA
end

# process data
lines = IO.readlines("data")
lines.each do |line|
  m = /(\d+)\s+(\d+)/.match(line)
  unless m
    puts "cannot compute"
    next
  end
  lhs = m[1].to_i
  rhs = m[2].to_i
  p lhs * rhs
end
server>