|
2303
|
1 ### Copyright (C) 1996 John W. Eaton |
|
|
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 ## |
|
|
28 ## See also: plot, semilogx, semilogy, loglog, polar, mesh, meshdom, contour, |
|
|
29 ## bar, stairs, gplot, gsplot, replot, xlabel, ylabel, title |
|
1713
|
30 |
|
2311
|
31 function [xx, yy] = meshgrid (x, y) |
|
1713
|
32 |
|
|
33 if (nargin == 1) |
|
|
34 y = x; |
|
|
35 endif |
|
|
36 if (nargin > 0 && nargin < 3) |
|
|
37 if (is_vector (x) && is_vector (y)) |
|
|
38 xlen = length (x); |
|
|
39 ylen = length (y); |
|
|
40 xx = zeros (ylen, xlen); |
|
|
41 yy = zeros (ylen, xlen); |
|
|
42 if (columns (x) == 1) |
|
|
43 x = x'; |
|
|
44 endif |
|
|
45 if (rows (y) == 1) |
|
|
46 y = y'; |
|
|
47 endif |
|
|
48 for i = 1:ylen |
|
|
49 xx(i,:) = x; |
|
|
50 endfor |
|
|
51 for i = 1:xlen |
|
|
52 yy(:,i) = y; |
|
|
53 endfor |
|
|
54 else |
|
|
55 error ("meshgrid: arguments must be vectors"); |
|
|
56 endif |
|
|
57 else |
|
|
58 usage ("[xx, yy] = meshgrid (x, y)"); |
|
|
59 endif |
|
|
60 |
|
|
61 endfunction |
