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subplot.m
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1999-12-24
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## Copyright (C) 1996, 1997 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.
## -*- texinfo -*-
## @deftypefn {Function File} {} subplot (@var{rows}, @var{cols}, @var{index})
## @deftypefnx {Function File} {} subplot (@var{rcn})
## Sets @code{gnuplot} in multiplt mode and plots in location
## given by index (there are @var{cols} by @var{rows} subwindws).
##
## Input:
##
## @table @var
## @item rows
## Number of rows in subplot grid.
##
## @item columns
## Number of columns in subplot grid.
##
## @item index
## Index of subplot where to make the next plot.
## @end table
##
## If only one argument is supplied, then it must be a three digit value
## specifying the location in digits 1 (rows) and 2 (columns) and the plot
## index in digit 3.
##
## The plot index runs row-wise. First all the columns in a row are filled
## and then the next row is filled.
##
## For example, a plot with 4 by 2 grid will have plot indices running as
## follows:
## @iftex
## @tex
## \vskip 10pt
## \hfil\vbox{\offinterlineskip\hrule
## \halign{\vrule#&&\qquad\hfil#\hfil\qquad\vrule\cr
## height13pt&1&2&3&4\cr height12pt&&&&\cr\noalign{\hrule}
## height13pt&5&6&7&8\cr height12pt&&&&\cr\noalign{\hrule}}}
## \hfil
## \vskip 10pt
## @end tex
## @end iftex
## @ifinfo
## @display
## @group
## +-----+-----+-----+-----+
## | 1 | 2 | 3 | 4 |
## +-----+-----+-----+-----+
## | 5 | 6 | 7 | 8 |
## +-----+-----+-----+-----+
## @end group
## @end display
## @end ifinfo
## @end deftypefn
## Author: Vinayak Dutt <Dutt.Vinayak@mayo.EDU>
## Adapted-By: jwe
function subplot (rows, columns, index)
if (! gnuplot_has_multiplt)
error ("subplot: gnuplot does not appear to support this feature");
endif
## global variables to keep track of multiplt options
global __multiplt_mode__ = 0;
global __multiplt_xsize__;
global __multiplt_ysize__;
global __multiplt_xn__;
global __multiplt_yn__;
global __multiplt_xi__;
global __multiplt_yi__;
if (nargin != 3 && nargin != 1)
usage ("subplot (rows, columns, index) or subplot (rcn)");
endif
if (nargin == 1)
if (! (is_scal (rows) && rows >= 0))
error ("subplot: input rcn has to be a positive scalar");
endif
tmp = rows;
index = rem (tmp, 10);
tmp = (tmp - index) / 10;
columns = rem (tmp, 10);
tmp = (tmp - columns) / 10;
rows = rem (tmp, 10);
elseif (! (is_scal (columns) && is_scal (rows) && is_scal (index)))
error ("subplot: columns, rows, and index have to be scalars");
endif
columns = round (columns);
rows = round (rows);
index = round (index);
if (index > columns*rows)
error ("subplot: index must be less than columns*rows");
endif
if (columns < 1 || rows < 1 || index < 1)
error ("subplot: columns,rows,index must be be positive");
endif
if (columns*rows == 1)
## switching to single plot ?
oneplot ();
## XXX FIXME XXX -- do we really need to reset these here?
__multiplt_xn__ = 1;
__multiplt_yn__ = 1;
else
## doing multiplt plots
if (! __multiplt_mode__
|| __multiplt_xn__ != columns
|| __multiplt_yn__ != rows)
__multiplt_mode__ = 1;
__multiplt_xn__ = columns;
__multiplt_yn__ = rows;
__multiplt_xsize__ = 1.0 ./ columns;
__multiplt_ysize__ = 1.0 ./ rows;
gnuplot_command_replot = "cle;rep";
gset multiplt;
eval (sprintf ("gset size %g, %g", __multiplt_xsize__,
__multiplt_ysize__));
endif
## get the sub plot location
yp = fix ((index-1)/columns);
xp = index - yp*columns - 1;
__multiplt_xi__ = ++xp;
__multiplt_yi__ = ++yp;
## set the origin
xo = (xp - 1.0) * __multiplt_xsize__;
yo = (rows - yp) * __multiplt_ysize__;
eval (sprintf ("gset origin %g, %g", xo, yo));
endif
endfunction