GNU Octave, version 2.0.17 (i586-pc-linux-gnu).
Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002 John W. Eaton.
This is free software with ABSOLUTELY NO WARRANTY.
For details, type `warranty'.

octave> set term postscript color
warning: set is obsolete -- use gset instead
octave> gset output 'pendulum.ps'
octave> pendulum_wrapper 
octave>