From: Benoit Daloze <eregontp@...>
Date: 2010-05-27T20:26:34+09:00
Subject: Re: how to call gnuplot from ruby?

On 27 May 2010 13:07, Pen Ttt <myocean135@yahoo.cn> wrote:
> i want to call gnuplot from ruby,my ruby script:
> `gnuplot` <<EOF
> plot sin(x)
> EOF
>
>
> pt@pt-laptop:~$ ruby  /home/pt/r.rb  ,then i get :
>
>  G N U P L O T
>  Version 4.2 patchlevel 6
>  last modified Sep 2009
>  System: Linux 2.6.32-22-generic
>
>  Copyright (C) 1986 - 1993, 1998, 2004, 2007 - 2009
>  Thomas Williams, Colin Kelley and many others
>
>  Type `help` to access the on-line reference manual.
>  The gnuplot FAQ is available from http://www.gnuplot.info/faq/
>
>  Send bug reports and suggestions to
> <http://sourceforge.net/projects/gnuplot>
>
>
> Terminal type set to 'wxt'
> --
> Posted via http://www.ruby-forum.com/.
>
>

With popen:

IO.popen('gnuplot', 'w') { |io|
  io.puts "plot sin(x)"
}

If you want easier control for reading/writing, use open3.

B.D.