update packages

[CreaPhase.git] / octave_packages / m / plot / private / __gnuplot_open_stream__.m

diff --git a/octave_packages/m/plot/private/__gnuplot_open_stream__.m b/octave_packages/m/plot/private/__gnuplot_open_stream__.m
new file mode 100644 (file)
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+++ b/octave_packages/m/plot/private/__gnuplot_open_stream__.m
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+## Copyright (C) 2009-2012 Ben Abbott
+##
+## 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 3 of the License, 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, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {@var{stream} =} __gnuplot_open_stream__ (@var{npipes}, @var{h})
+## Undocumented internal function.
+## @end deftypefn
+
+## Author: Ben Abbott <bpabbott@mac.com>
+## Created: 2009-04-11
+
+function plot_stream = __gnuplot_open_stream__ (npipes, h)
+  [prog, args] = gnuplot_binary ();
+  if (npipes > 1)
+    [plot_stream(1), plot_stream(2), pid] = popen2 (prog, args{:});
+    if (pid < 0)
+      error ("__gnuplot_open_stream__: failed to open connection to gnuplot");
+    else
+      plot_stream(3) = pid;
+    endif
+  else
+    plot_stream = popen (sprintf ("%s ", prog, args{:}), "w");
+    if (plot_stream < 0)
+      error ("__gnuplot_open_stream__: failed to open connection to gnuplot");
+    endif
+  endif
+  if (nargin > 1)
+    set (h, "__plot_stream__", plot_stream);
+  endif
+endfunction