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+# Copyright (C) 1995 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 multiplot (xn, yn)
+
+# usage: multiplot (xn, yn)
+#
+# Sets and resets multiplot mode
+#
+# If multiplot(0,0) then it will close multiplot mode and and if
+# arguments are non-zero, then it will set up multiplot mode with
+# xn,yn subplots along x and y axes. 
+#
+# NOTE: this will work only with gnuplot installed with
+#       multiplot patch
+
+# Written by Vinayak Dutt, Dutt.Vinayak@mayo.EDU  3 Jul 95 
+
+# global variables to keep track of multiplot options
+
+  global multiplot_mode
+  global multi_xsize multi_ysize
+  global multi_xn multi_yn
+  global multi_xi multi_yi
+
+# This is a real kludge.  We gnuplot should be made so that replot can
+# be executed while doing multiple plots...
+
+  global multiplot_save_auto_replot = automatic_replot
+
+  if (nargin != 2)
+    usage ("multiplot (xn, yn)");
+  endif
+
+  if (! (is_scalar (xn) && is_scalar (yn)))
+    error ("multiplot: xn and yn have to be scalars");
+  endif
+
+  if ((isstr (automatic_replot) && strcmp (automatic_replot,"true"))
+       || automatic_replot)
+    warning ("turning off automatic replot for multiplot mode");
+    multiplot_save_auto_replot = automatic_replot;
+    automatic_replot = 0;
+  endif
+
+  xn = round (xn);
+  yn = round (yn);
+
+  if (xn == 0 && yn == 0)
+
+    set nomultiplot;
+    set size 1,1
+    set origin 0,0
+
+    multiplot_mode = 0;
+    multi_xsize = 1;
+    multi_ysize = 1;
+    multi_xn = 1;
+    multi_yn = 1;
+    multi_xi = 1;
+    multi_yi = 1;
+
+# Someone may have reset it betweeen calls...
+
+    if (! isstr (automatic_replot) && ! automatic_replot)
+      automatic_replot = multiplot_save_auto_replot;
+    endif
+
+    return;
+
+  else
+
+    if (xn < 1 || yn < 1)
+      error ("multiplot: xn and yn have to be positive integers");
+    endif
+
+    set multiplot;
+
+    xsize = 1.0 ./ xn;
+    ysize = 1.0 ./ yn;
+
+    eval (sprintf ("set size %g, %g", xsize, ysize));
+
+    xo = 0.0;
+    yo = (yn - 1.0)*ysize;
+
+    eval (sprintf ("set origin %g, %g", xo, yo));
+
+    multiplot_mode = 1;
+    multi_xsize = xsize;
+    multi_ysize = ysize;
+    multi_xn = xn;
+    multi_yn = yn;
+    multi_xi = 1;
+    multi_yi = 1;
+
+  endif
+
+endfunction