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+## Copyright (C) 1996, 1997 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 2, 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, write to the Free
+## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+## 02110-1301, USA.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} meshc (@var{x}, @var{y}, @var{z})
+## Plot a mesh and contour given matrices @var{x}, and @var{y} from 
+## @code{meshgrid} and a matrix @var{z} corresponding to the @var{x} and 
+## @var{y} coordinates of the mesh.  If @var{x} and @var{y} are vectors, 
+## then a typical vertex is (@var{x}(j), @var{y}(i), @var{z}(i,j)).  Thus, 
+## columns of @var{z} correspond to different @var{x} values and rows of 
+## @var{z} correspond to different @var{y} values.
+## @seealso{meshgrid, mesh, contour}
+## @end deftypefn
+
+function h = meshc (varargin)
+
+  newplot ();
+
+  if (nargin == 1)
+    z = varargin{1};
+    if (ismatrix (z))
+      [nr, nc] = size (z);
+      x = 1:nc;
+      y = (1:nr)';
+    else
+      error ("meshc: argument must be a matrix");
+    endif
+  elseif (nargin == 3)
+    x = varargin{1};
+    y = varargin{2};
+    z = varargin{3};
+
+    if (isvector (x) && isvector (y) && ismatrix (z))
+      if (rows (z) == length (y) && columns (z) == length (x))
+        x = x(:)';
+        y = y(:);
+      else
+        msg = "meshc: rows (z) must be the same as length (y) and";
+        msg = sprintf ("%s\ncolumns (z) must be the same as length (x)", msg);
+        error (msg);
+      endif
+    elseif (ismatrix (x) && ismatrix (y) && ismatrix (z))
+      if (! (size_equal (x, y) && size_equal (x, z)))
+        error ("meshc: x, y, and z must have same dimensions");
+      endif
+    else
+      error ("meshc: x and y must be vectors and z must be a matrix");
+    endif
+  else
+    print_usage ();
+  endif
+
+  ## make a default line object, and make it the current axes for the
+  ## current figure.
+  ca = gca ();
+
+  tmp = __go_surface__ (ca, "xdata", x, "ydata", y, "zdata", z);
+
+  set (ca, "view", [-37.5, 30]);
+
+  hold on;
+
+  [c, lev] = contourc (varargin{:});
+
+  cmap = get (gcf(), "colormap");
+  
+  levx = linspace (min (lev), max (lev), size (cmap, 1));
+
+  drawnow();
+  ax = axis();
+  zmin = 2 * ax(5) - ax(6);
+
+  ## decode contourc output format
+  i1 = 1;
+  while (i1 < length (c))
+
+    clev = c(1,i1);
+    clen = c(2,i1);
+
+    ccr = interp1 (levx, cmap(:,1), clev);
+    ccg = interp1 (levx, cmap(:,2), clev);
+    ccb = interp1 (levx, cmap(:,3), clev);
+
+    ii = i1+1:i1+clen;
+    line (c(1,ii), c(2,ii), zmin*ones(size(ii)), "color", [ccr, ccg, ccb]);
+
+    i1 += c(2,i1)+1;
+  endwhile
+  
+  if (nargout > 0)
+    h = tmp;
+  endif
+endfunction