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1 ## Copyright (C) 1996 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, 59 Temple Place - Suite 330, Boston, MA |
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18 ## 02111-1307, USA. |
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19 |
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20 ## usage: [xx, yy] = meshgrid (x, y) |
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21 ## |
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22 ## Given vectors of x and y coordinates, return two matrices corresponding |
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23 ## to the x and y coordinates of a mesh. The rows of xx are copies of x, |
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24 ## and the columns of yy are copies of y. |
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25 ## |
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26 ## [xx, yy] = meshgrid (x) is an abbreviation for [xx, yy] = meshgrid (x, x). |
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27 ## |
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28 ## See also: plot, semilogx, semilogy, loglog, polar, mesh, meshdom, contour, |
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29 ## bar, stairs, gplot, gsplot, replot, xlabel, ylabel, title |
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30 |
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31 ## Author: jwe |
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32 |
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33 function [xx, yy] = meshgrid (x, y) |
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34 |
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35 if (nargin == 1) |
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36 y = x; |
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37 endif |
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38 if (nargin > 0 && nargin < 3) |
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39 if (is_vector (x) && is_vector (y)) |
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40 xlen = length (x); |
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41 ylen = length (y); |
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42 xx = zeros (ylen, xlen); |
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43 yy = zeros (ylen, xlen); |
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44 if (columns (x) == 1) |
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45 x = x'; |
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46 endif |
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47 if (rows (y) == 1) |
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48 y = y'; |
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49 endif |
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50 for i = 1:ylen |
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51 xx(i,:) = x; |
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52 endfor |
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53 for i = 1:xlen |
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54 yy(:,i) = y; |
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55 endfor |
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56 else |
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57 error ("meshgrid: arguments must be vectors"); |
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58 endif |
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59 else |
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60 usage ("[xx, yy] = meshgrid (x, y)"); |
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61 endif |
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62 |
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63 endfunction |
