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annotate scripts/plot/__gnuplot_open_stream__.m @ 12073:fe30458b1de8 release-3-2-x

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try to avoid gnuplot zombies
author John W. Eaton <jwe@octave.org>
date Wed, 26 Aug 2009 08:17:08 +0200
parents 4bb94a71913b
children
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4bb94a71913b __gnuplot_open_stream__.m: New function and its application.
Ben Abbott <bpabbott@mac.com>
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1 ## Copyright (C) 2009 Ben Abbott
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2 ##
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3 ## This program is free software; you can redistribute it and/or modify
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4 ## it under the terms of the GNU General Public License as published by
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5 ## the Free Software Foundation; either version 2 of the License, or
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6 ## (at your option) any later version.
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7 ##
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8 ## This program is distributed in the hope that it will be useful,
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9 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 ## GNU General Public License for more details.
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12 ##
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13 ## You should have received a copy of the GNU General Public License
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14 ## along with Octave; see the file COPYING. If not, see
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15 ## <http://www.gnu.org/licenses/>.
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16
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17 ## -*- texinfo -*-
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18 ## @deftypefn {Function File} {@var{stream}} __gnuplot_open_stream__ (@var{npipes}, @var{h})
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19 ## Undocumented internal function.
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20 ## @end deftypefn
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21
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22 ## Author: Ben Abbott <bpabbott@mac.com>
4bb94a71913b __gnuplot_open_stream__.m: New function and its application.
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23 ## Created: 2009-04-11
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24
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25 function plot_stream = __gnuplot_open_stream__ (npipes, h)
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26 cmd = gnuplot_binary ();
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27 if (npipes > 1)
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28 [plot_stream(1), plot_stream(2), pid] = popen2 (cmd);
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29 if (pid < 0)
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30 error ("__gnuplot_open_stream__: failed to open connection to gnuplot.");
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31 else
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32 plot_stream(3) = pid;
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33 endif
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34 else
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35 plot_stream = popen (cmd, "w");
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36 if (plot_stream < 0)
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37 error ("__gnuplot_open_stream__: failed to open connection to gnuplot.");
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38 endif
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39 endif
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40 if (nargin > 1)
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41 set (h, "__plot_stream__", plot_stream);
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42 endif
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43 endfunction