## Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 2000, 2003, 2005,
##               2006, 2007 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 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/>.

## Undocumented internal function.

## Author: jwe

function retval = __plt2mm__ (h, x, y, options, properties)

  if (nargin < 3 || nargin > 5)
    print_usage ();
  endif

  if (nargin < 4 || isempty (options))
    options = __default_plot_options__ ();
  endif

  if (nargin < 5)
    properties = {};
  endif

  [x_nr, x_nc] = size (x);
  [y_nr, y_nc] = size (y);

  k = 1;
  if (x_nr == y_nr && x_nc == y_nc)
    if (x_nc > 0)
      if (numel (options) == 1)
	options = repmat (options(:), x_nc, 1);
      endif
      retval = zeros (x_nc, 1);
      for i = 1:x_nc
	tkey = options(i).key;
	if (! isempty (tkey))
	  set (h, "key", "on");
	endif
	color = options(i).color;
	if (isempty (color))
	  color = __next_line_color__ ();
	endif
	retval(i) = line (x(:,i), y(:,i), "keylabel", tkey, "color", color,
			  "linestyle", options(i).linestyle,
			  "marker", options(i).marker, properties{:});
      endfor
    else
      error ("__plt2mm__: arguments must be a matrices");
    endif
  else
    error ("__plt2mm__: matrix dimensions must match");
  endif

endfunction