# Copyright (C) 1996 John W. Eaton
# 
# This file is part of Octave.
# 
# Octave is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2, or (at your option) any
# later version.
# 
# Octave is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
# for more details.
# 
# You should have received a copy of the GNU General Public License
# along with Octave; see the file COPYING.  If not, write to the Free
# Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

function figure (n)

# usage: figure (n)
#
# Set the current plot window to plot window N.  This function
# currently requires X11 and a recent version of gnuplot.

  if (nargin == 1)
    if (gnuplot_has_frames)
      if (! isempty (getenv ("DISPLAY")))
	eval (sprintf ("set term x11 %d\n", n));
      else
	error ("figure: requires X11 and valid DISPLAY");
      endif
    else
      error ("figure: gnuplot doesn't appear to support this feature");
    endif
  else
    usage ("figure (n)");
  endif
endfunction