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## Copyright (C) 1996 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, 59 Temple Place - Suite 330, Boston, MA
## 02111-1307, USA.
## usage: mesh (x, y, z)
##
## Surface plot. If x, y, and z are matrices with the same dimensions,
## then corresponding elements represent vertices of the plot. If x and
## y are vectors, then a typical vertex is (x(j), y(i), z(i,j)). Thus,
## columns of z correspond to different x values and rows of z correspond
## to different y values.
##
## See also: plot, semilogx, semilogy, loglog, polar, meshgrid, meshdom,
## contour, bar, stairs, gplot, gsplot, replot, xlabel, ylabel, title
## Author: jwe
function mesh (x, y, z)
## XXX FIXME XXX -- these plot states should really just be set
## temporarily, probably inside an unwind_protect block, but there is
## no way to determine their current values.
if (nargin == 1)
z = x;
if (is_matrix (z))
gset hidden3d;
gset data style lines;
gset surface;
gset nocontour;
gset noparametric;
gset view 60, 30, 1, 1
gsplot (z');
else
error ("mesh: argument must be a matrix");
endif
elseif (nargin == 3)
if (is_vector (x) && is_vector (y) && is_matrix (z))
xlen = length (x);
ylen = length (y);
if (xlen == columns (z) && ylen == rows (z))
if (rows (y) == 1)
y = y';
endif
len = 3 * xlen;
zz = zeros (ylen, len);
k = 1;
for i = 1:3:len
zz(:,i) = x(k) * ones (ylen, 1);
zz(:,i+1) = y;
zz(:,i+2) = z(:,k);
k++;
endfor
gset hidden3d;
gset data style lines;
gset surface;
gset nocontour;
gset parametric;
gset view 60, 30, 1, 1
gsplot (zz);
gset noparametric;
else
msg = "mesh: rows (z) must be the same as length (x) and";
msg = sprintf ("%s\ncolumns (z) must be the same as length (y)", msg);
error (msg);
endif
elseif (is_matrix (x) && is_matrix (y) && is_matrix (z))
xlen = columns (z);
ylen = rows (z);
if (xlen == columns (x) && xlen == columns (y) &&
ylen == rows (x) && ylen == rows(y))
len = 3 * xlen;
zz = zeros (ylen, len);
k = 1;
for i = 1:3:len
zz(:,i) = x(:,k);
zz(:,i+1) = y(:,k);
zz(:,i+2) = z(:,k);
k++;
endfor
gset hidden3d;
gset data style lines;
gset surface;
gset nocontour;
gset parametric;
gset view 60, 30, 1, 1
gsplot (zz);
gset noparametric;
else
error ("mesh: x, y, and z must have same dimensions");
endif
else
error ("mesh: x and y must be vectors and z must be a matrix");
endif
else
usage ("mesh (z)");
endif
endfunction
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