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+## Copyright (C) 2007 David Bateman
+##
+## 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/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} meshz (@var{x}, @var{y}, @var{z})
+## Plot a curtain mesh 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 retval = meshz (varargin)
+
+  if (isscalar (varargin{1}) && ishandle (varargin{1}))
+    h = varargin {1};
+    if (! strcmp (get (h, "type"), "axes"))
+      error ("meshz: expecting first argument to be an axes object");
+    endif
+    oldh = gca ();
+    unwind_protect
+      axes (h);
+      tmp = __meshz__ (varargin{2:end});
+    unwind_protect_cleanup
+      axes (oldh);
+    end_unwind_protect
+  else
+    tmp = __meshz__ (varargin{:});
+  endif
+
+  if (nargout > 0)
+    retval = tmp;
+  endif
+
+endfunction
+
+function h = __meshz__ (varargin)
+
+  ioff = nargin + 1;
+  for i = 1 : nargin
+    if (ischar (varargin {i}))
+      ioff = i;
+      break;
+    endif
+  endfor
+
+  ## Bundle C matrix back into varargin
+  if (ioff == 3 || ioff == 5)
+    ioff --;
+  endif
+
+  if (ioff == 2)
+    z = varargin {1};
+    [m, n] = size (z);
+    x = 1 : n;
+    y = (1 : m).';
+  else
+    x = varargin {1};
+    y = varargin {2};
+    z = varargin {3};
+  endif
+
+
+  if (isvector (x) && isvector (y))
+    x = [x(1), x(:).', x(end)];
+    y = [y(1); y(:); y(end)];
+  else
+    x = [x(1, 1), x(1, :), x(1, end);
+	 x(:, 1), x, x(:, end);
+	 x(end, 1), x(end, :), x(end, end)]; 
+    y = [y(1, 1), y(1, :), y(1, end);
+	 y(:, 1), y, y(:, end);
+	 y(end, 1), y(end, :), y(end, end)]; 
+  endif
+
+  zref = min(z(isfinite(z)));
+  z = [zref .* ones(1, size(z, 2) + 2);
+       zref .* ones(size(z, 1), 1), z, zref .* ones(size(z, 1), 1); 
+       zref.* ones(1, size(z, 2) + 2)];
+
+  h = mesh (x, y, z, varargin{ioff:end});
+
+endfunction