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1 ## Copyright (C) 1996, 1997 John W. Eaton |
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2 ## |
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3 ## This file is part of Octave. |
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4 ## |
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5 ## Octave is free software; you can redistribute it and/or modify it |
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6 ## under the terms of the GNU General Public License as published by |
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7 ## the Free Software Foundation; either version 2, or (at your option) |
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8 ## any later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but |
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 ## General Public License for more details. |
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14 ## |
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15 ## You should have received a copy of the GNU General Public License |
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16 ## along with Octave; see the file COPYING. If not, write to the Free |
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17 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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18 ## 02110-1301, USA. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {[@var{xx}, @var{yy}, @var{zz}] =} meshgrid (@var{x}, @var{y}, @var{z}) |
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22 ## @deftypefnx {Function File} {[@var{xx}, @var{yy}] =} meshgrid (@var{x}, @var{y}) |
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23 ## @deftypefnx {Function File} {[@var{xx}, @var{yy}] =} meshgrid (@var{x}) |
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24 ## Given vectors of @var{x} and @var{y} and @var{z} coordinates, and |
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25 ## returning 3 arguments, return three dimensional arrays corresponding |
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26 ## to the @var{x}, @var{y}, and @var{z} coordinates of a mesh. When |
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27 ## returning only 2 arguments, return matrices corresponding to the |
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28 ## @var{x} and @var{y} coordinates of a mesh. The rows of @var{xx} are |
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29 ## copies of @var{x}, and the columns of @var{yy} are copies of @var{y}. |
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30 ## If @var{y} is omitted, then it is assumed to be the same as @var{x}, |
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31 ## and @var{z} is assumed the same as @var{y}. |
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32 ## @seealso{mesh, contour} |
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33 ## @end deftypefn |
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34 |
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35 ## Author: jwe |
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36 |
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37 function [xx, yy, zz] = meshgrid (x, y, z) |
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38 |
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39 if (nargin == 0 || nargin > 3) |
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40 usage ("[xx, yy, zz] = meshgrid (x, y, z)"); |
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41 endif |
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42 |
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43 if (nargin < 2) |
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44 y = x; |
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45 endif |
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46 |
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47 if (nargout < 3) |
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48 if (isvector (x) && isvector (y)) |
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49 xx = ones (length (y), 1) * x(:).'; |
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50 yy = y(:) * ones (1, length (x)); |
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51 else |
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52 error ("meshgrid: arguments must be vectors"); |
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53 endif |
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54 else |
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55 if (nargin < 3) |
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56 z = y; |
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57 endif |
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58 if (isvector (x) && isvector (y) && isvector (z)) |
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59 lenx = length (x); |
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60 leny = length (y); |
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61 lenz = length (z); |
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62 xx = repmat (ones (leny, 1) * x(:).', [1, 1, lenz]); |
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63 yy = repmat (y(:) * ones (1, lenx), [1, 1, lenz]); |
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64 zz = reshape (repmat (z(:).', lenx*leny, 1)(:), leny, lenx, lenz); |
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65 else |
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66 error ("meshgrid: arguments must be vectors"); |
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67 endif |
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68 endif |
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69 |
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70 endfunction |
