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annotate scripts/plot/meshgrid.m @ 1713:d9e42d0bab09

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[project @ 1996-01-08 02:22:55 by jwe] Initial revision
author jwe
date Mon, 08 Jan 1996 02:22:55 +0000
parents
children 5d29638dd524
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1 # Copyright (C) 1993, 1994, 1995 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 the
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7 # Free Software Foundation; either version 2, or (at your option) any
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8 # later version.
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9 #
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10 # Octave is distributed in the hope that it will be useful, but WITHOUT
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11 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 # 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, 675 Mass Ave, Cambridge, MA 02139, USA.
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18
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19 function [xx, yy] = meshgrid (x, y)
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20
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21 # usage: [xx, yy] = meshgrid (x, y)
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22 #
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23 # Given vectors of x and y coordinates, return two matrices corresponding
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24 # to the x and y coordinates of a mesh. The rows of xx are copies of x,
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25 # and the columns of yy are copies of y.
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26 #
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27 # [xx, yy] = meshgrid (x) is an abbreviation for [xx, yy] = meshgrid (x, x).
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28 #
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29 # See also: plot, semilogx, semilogy, loglog, polar, mesh, meshdom, contour,
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30 # bar, stairs, gplot, gsplot, replot, xlabel, ylabel, title
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31
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32 if (nargin == 1)
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33 y = x;
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34 endif
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35 if (nargin > 0 && nargin < 3)
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36 if (is_vector (x) && is_vector (y))
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37 xlen = length (x);
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38 ylen = length (y);
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39 xx = zeros (ylen, xlen);
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40 yy = zeros (ylen, xlen);
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41 if (columns (x) == 1)
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42 x = x';
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43 endif
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44 if (rows (y) == 1)
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45 y = y';
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46 endif
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47 for i = 1:ylen
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48 xx(i,:) = x;
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49 endfor
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50 for i = 1:xlen
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51 yy(:,i) = y;
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52 endfor
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53 else
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54 error ("meshgrid: arguments must be vectors");
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55 endif
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56 else
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57 usage ("[xx, yy] = meshgrid (x, y)");
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58 endif
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59
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60 endfunction