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'
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