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/usr/share/octave/packages/optim-1.3.0/private/__plot_cmds__.m is in octave-optim 1.3.0-1.

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## Copyright (C) 2010-2013 Olaf Till <i7tiol@t-online.de>
##
## This program 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.
##
## This program 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 this program; If not, see <http://www.gnu.org/licenses/>.

function __plot_cmds__ (x, y, f)

  persistent lgnd;
  persistent use_x;
  if (nargin == 0)
    ## reset function
    lgnd = [];
    return;
  endif

  if (length (size (f)) > 2)
    return;
  endif

  if (isempty (lgnd));
    n = size (y, 2);
    if (n == 1)
      lgnd = {"data", "fit"};
    else
      id = num2str ((1:n).');
      lgnd1 = cat (2, repmat ("data ", n, 1), id);
      lgnd2 = cat (2, repmat ("fit ", n, 1), id);
      lgnd = cat (1, cellstr (lgnd1), cellstr (lgnd2));
    endif
    use_x = size (x, 1) == size (y, 1);
  endif

  x = x(:, 1);
  if (use_x)
    plot (x, y, "marker", "+", "linestyle", "none", x, f);
  else
    plot (y, "marker", "+", "linestyle", "none", f);
  endif
  legend (lgnd);
  drawnow;

endfunction