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−## Copyright (C) 2008-2012 John W. Eaton
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−##
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−## This file is part of Octave.
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−##
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−## Octave is free software; you can redistribute it and/or modify it
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−## under the terms of the GNU General Public License as published by
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−## the Free Software Foundation; either version 3 of the License, or (at
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−## your option) any later version.
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−##
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−## Octave is distributed in the hope that it will be useful, but
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−## WITHOUT ANY WARRANTY; without even the implied warranty of
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−## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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−## General Public License for more details.
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−##
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−## You should have received a copy of the GNU General Public License
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−## along with Octave; see the file COPYING.  If not, see
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−## <http://www.gnu.org/licenses/>.
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−
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−## -*- texinfo -*-
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−## @deftypefn  {Loadable Function} {[@var{prog}, @var{args}] =} gnuplot_binary ()
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−## @deftypefnx {Loadable Function} {[@var{old_prog}, @var{old_args}] =} gnuplot_binary (@var{new_prog}, @var{arg1}, @dots{})
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−## Query or set the name of the program invoked by the plot command
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−## when the graphics toolkit is set to "gnuplot".  Additional arguments to
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−## pass to the external plotting program may also be given.
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−## The default value is @code{"gnuplot"} without additional arguments.
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−## @xref{Installation}.
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−## @end deftypefn
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−
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−## Author: jwe
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−
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−function [prog, args] = gnuplot_binary (new_prog, varargin)
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−
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−  persistent gp_binary = %OCTAVE_CONF_GNUPLOT%;
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−  persistent gp_args = {};
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−
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−  if (nargout > 0 || nargin == 0)
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−    prog = gp_binary;
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−    args = gp_args;
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−  endif
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−
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−  if (nargin == 1)
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−    if (ischar (new_prog))
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−      if (! isempty (new_prog))
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−	gp_binary = new_prog;
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−      else
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−	error ("gnuplot_binary: value must not be empty");
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−      endif
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−    else
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−      error ("gnuplot_binary: expecting program to be a character string");
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−    endif
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−  endif
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−
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−  if (nargin > 1)
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−    if (iscellstr (varargin))
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−      gp_args = varargin;
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−    else
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−      error ("gnuplot_binary: expecting arguments to be character strings");
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−    endif
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−  endif
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−
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−endfunction