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−## Copyright (C) 1996-2012 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 {Function File} {} meshc (@var{x}, @var{y}, @var{z})
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−## Plot a mesh and contour given matrices @var{x}, and @var{y} from
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−## @code{meshgrid} and a matrix @var{z} corresponding to the @var{x} and
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−## @var{y} coordinates of the mesh.  If @var{x} and @var{y} are vectors,
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−## then a typical vertex is (@var{x}(j), @var{y}(i), @var{z}(i,j)).  Thus,
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−## columns of @var{z} correspond to different @var{x} values and rows of
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−## @var{z} correspond to different @var{y} values.
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−## @seealso{meshgrid, mesh, contour}
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−## @end deftypefn
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−
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−function h = meshc (varargin)
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−
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−  newplot ();
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−
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−  tmp = surface (varargin{:});
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−
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−  ax = get (tmp, "parent");
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−
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−  set (tmp, "facecolor", "w");
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−  set (tmp, "edgecolor", "flat");
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−  ## FIXME - gnuplot does not support a filled surface and a
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−  ## non-filled contour. 3D filled patches are also not supported.
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−  ## Thus, the facecolor will be transparent for the gnuplot
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−  ## backend.
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−
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−  if (! ishold ())
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−    set (ax, "view", [-37.5, 30],
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−         "xgrid", "on", "ygrid", "on", "zgrid", "on");
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−  endif
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−
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−  drawnow ();
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−  zmin = get (ax, "zlim")(1);
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−
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−  [c, tmp2] = __contour__ (ax, zmin, varargin{:});
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−
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−  tmp = [tmp; tmp2];
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−
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−  if (nargout > 0)
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−    h = tmp;
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−  endif
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−
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−endfunction