|
2847
|
1 ## Copyright (C) 1996, 1997 John W. Eaton |
|
2313
|
2 ## |
|
|
3 ## This file is part of Octave. |
|
|
4 ## |
|
|
5 ## Octave is free software; you can redistribute it and/or modify it |
|
|
6 ## under the terms of the GNU General Public License as published by |
|
|
7 ## the Free Software Foundation; either version 2, or (at your option) |
|
|
8 ## any later version. |
|
|
9 ## |
|
|
10 ## Octave is distributed in the hope that it will be useful, but |
|
|
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
|
|
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
|
13 ## General Public License for more details. |
|
|
14 ## |
|
|
15 ## You should have received a copy of the GNU General Public License |
|
|
16 ## along with Octave; see the file COPYING. If not, write to the Free |
|
|
17 ## Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
|
|
18 ## 02111-1307, USA. |
|
1713
|
19 |
|
2311
|
20 ## usage: [xx, yy] = meshgrid (x, y) |
|
|
21 ## |
|
|
22 ## Given vectors of x and y coordinates, return two matrices corresponding |
|
|
23 ## to the x and y coordinates of a mesh. The rows of xx are copies of x, |
|
|
24 ## and the columns of yy are copies of y. |
|
|
25 ## |
|
|
26 ## [xx, yy] = meshgrid (x) is an abbreviation for [xx, yy] = meshgrid (x, x). |
|
|
27 ## |
|
2710
|
28 ## See sombrero.m for an example of using meshgrid. |
|
|
29 ## |
|
2311
|
30 ## See also: plot, semilogx, semilogy, loglog, polar, mesh, meshdom, contour, |
|
2325
|
31 ## bar, stairs, gplot, gsplot, replot, xlabel, ylabel, title |
|
1713
|
32 |
|
2314
|
33 ## Author: jwe |
|
|
34 |
|
2311
|
35 function [xx, yy] = meshgrid (x, y) |
|
1713
|
36 |
|
|
37 if (nargin == 1) |
|
|
38 y = x; |
|
|
39 endif |
|
|
40 if (nargin > 0 && nargin < 3) |
|
|
41 if (is_vector (x) && is_vector (y)) |
|
|
42 xlen = length (x); |
|
|
43 ylen = length (y); |
|
|
44 xx = zeros (ylen, xlen); |
|
|
45 yy = zeros (ylen, xlen); |
|
|
46 if (columns (x) == 1) |
|
|
47 x = x'; |
|
|
48 endif |
|
|
49 if (rows (y) == 1) |
|
|
50 y = y'; |
|
|
51 endif |
|
|
52 for i = 1:ylen |
|
|
53 xx(i,:) = x; |
|
|
54 endfor |
|
|
55 for i = 1:xlen |
|
|
56 yy(:,i) = y; |
|
|
57 endfor |
|
|
58 else |
|
|
59 error ("meshgrid: arguments must be vectors"); |
|
|
60 endif |
|
|
61 else |
|
|
62 usage ("[xx, yy] = meshgrid (x, y)"); |
|
|
63 endif |
|
|
64 |
|
|
65 endfunction |
