|
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 |
|
7016
|
7 ## the Free Software Foundation; either version 3 of the License, or (at |
|
|
8 ## your option) any later version. |
|
2313
|
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 |
|
7016
|
16 ## along with Octave; see the file COPYING. If not, see |
|
|
17 ## <http://www.gnu.org/licenses/>. |
|
1713
|
18 |
|
3407
|
19 ## -*- texinfo -*- |
|
5378
|
20 ## @deftypefn {Function File} {[@var{xx}, @var{yy}, @var{zz}] =} meshgrid (@var{x}, @var{y}, @var{z}) |
|
|
21 ## @deftypefnx {Function File} {[@var{xx}, @var{yy}] =} meshgrid (@var{x}, @var{y}) |
|
3439
|
22 ## @deftypefnx {Function File} {[@var{xx}, @var{yy}] =} meshgrid (@var{x}) |
|
5717
|
23 ## Given vectors of @var{x} and @var{y} and @var{z} coordinates, and |
|
|
24 ## returning 3 arguments, return three dimensional arrays corresponding |
|
|
25 ## to the @var{x}, @var{y}, and @var{z} coordinates of a mesh. When |
|
|
26 ## returning only 2 arguments, return matrices corresponding to the |
|
|
27 ## @var{x} and @var{y} coordinates of a mesh. The rows of @var{xx} are |
|
|
28 ## copies of @var{x}, and the columns of @var{yy} are copies of @var{y}. |
|
|
29 ## If @var{y} is omitted, then it is assumed to be the same as @var{x}, |
|
|
30 ## and @var{z} is assumed the same as @var{y}. |
|
5642
|
31 ## @seealso{mesh, contour} |
|
3407
|
32 ## @end deftypefn |
|
1713
|
33 |
|
2314
|
34 ## Author: jwe |
|
|
35 |
|
5378
|
36 function [xx, yy, zz] = meshgrid (x, y, z) |
|
1713
|
37 |
|
5717
|
38 if (nargin == 0 || nargin > 3) |
|
6046
|
39 print_usage (); |
|
5717
|
40 endif |
|
|
41 |
|
|
42 if (nargin < 2) |
|
1713
|
43 y = x; |
|
|
44 endif |
|
5717
|
45 |
|
6813
|
46 ## Use repmat to ensure that the result values have the same type as |
|
|
47 ## the arguments. |
|
|
48 |
|
5717
|
49 if (nargout < 3) |
|
4030
|
50 if (isvector (x) && isvector (y)) |
|
6813
|
51 xx = repmat (x(:).', length (y), 1); |
|
|
52 yy = repmat (y(:), 1, length (x)); |
|
1713
|
53 else |
|
|
54 error ("meshgrid: arguments must be vectors"); |
|
|
55 endif |
|
|
56 else |
|
5717
|
57 if (nargin < 3) |
|
|
58 z = y; |
|
|
59 endif |
|
|
60 if (isvector (x) && isvector (y) && isvector (z)) |
|
|
61 lenx = length (x); |
|
|
62 leny = length (y); |
|
|
63 lenz = length (z); |
|
6813
|
64 xx = repmat (repmat (x(:).', leny, 1), [1, 1, lenz]); |
|
|
65 yy = repmat (repmat (y(:), 1, lenx), [1, 1, lenz]); |
|
5717
|
66 zz = reshape (repmat (z(:).', lenx*leny, 1)(:), leny, lenx, lenz); |
|
|
67 else |
|
6813
|
68 error ("meshgrid: arguments must be vectors"); |
|
5717
|
69 endif |
|
1713
|
70 endif |
|
|
71 |
|
|
72 endfunction |
