[OctDev] meshgrid 3D

[Ben B. <bar...@al...>]

meshgrid did not handle 3-d gridding, here is a simple fix for:
/usr/local/share/octave/2.9.3/m/plot/meshgrid.m

## 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} {[@var{xx}, @var{yy}] =} meshgrid 
(@var{x}, @var{y})
## @deftypefnx {Function File} {[@var{xx}, @var{yy}] =} meshgrid (@var{x})
## Given vectors of @var{x} and @var{y} coordinates, return two matrices 
corresponding
## to the @var{x} and @var{y} coordinates of a mesh.  The rows of 
@var{xx} are copies of @var{x},
## and the columns of @var{yy} are copies of @var{y}.
## @end deftypefn
##
## @seealso{sombrero, plot, semilogx, semilogy, loglog, polar, mesh,
## meshdom, contour, bar, stairs, replot, xlabel, ylabel, and title}

## Author: jwe

function [xx, yy, zz] = meshgrid (x, y, z)

  if (nargin == 1)
    y = x;
  endif
  if (nargin > 0 && nargin < 3)
    if (isvector (x) && isvector (y))
      xx = ones (length (y), 1) * x(:).';
      yy = y(:) * ones (1, length (x));
    else
      error ("meshgrid: arguments must be vectors");
    end
  elseif nargin==3
   if (isvector (x) && isvector (y) && isvector (z))
      lenx=length(x); leny=length(y); lenz=length(z);
      xx = repmat( ones (leny, 1) * x(:).', [1,1,lenz]);
      yy = repmat( y(:) * ones (1, lenx), [1,1,lenz]);
      zz = reshape(repmat(z(:).',lenx*leny,1)(:),leny,lenx,lenz);
   else
      error ("meshgrid: arguments must be vectors");
    end  
  else
    usage ("[xx, yy, zz] = meshgrid (x, y, z)");
  end
  
endfunction


Is this the right forum for this?

Ben Barrowes