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1 ## Copyright (C) 2006, Alexander Barth |
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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{y1}, @var{y2}, ..., @var{y}n]} = ndgrid (@var{x1}, @var{x2}, ..., @var{x}n) |
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22 ## @deftypefnx {Function File} {[@var{y1}, @var{y2}, ..., @var{y}n]} = ndgrid (@var{x}) |
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23 ## Given n vectors @var{x1}, ... @var{x}n, ndgrid returns n arrays of dimension n. |
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24 ## The elements of the ith output argument contains the elements of the vector |
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25 ## @var{x}i repeated over all dimensions different from the ith dimension. |
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26 ## Calling ndgrid with only one input argument @var{x} is equivalent of calling ndgrid with |
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27 ## all n input arguments equal to @var{x}: |
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28 ## |
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29 ## [@var{y1}, @var{y2}, ..., @var{y}n] = ndgrid (@var{x}, ..., @var{x}) |
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30 ## @seealso{meshgrid} |
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31 ## @end deftypefn |
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32 |
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33 ## Author: Alexander Barth <abarth@marine.usf.edu> |
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34 |
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35 function varargout = ndgrid (varargin) |
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36 |
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37 if (nargin == 1) |
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38 n = max ([nargout, 2]); |
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39 ## If only one input argument is given, repeat it n-times |
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40 varargin{1:n} = varargin{1}; |
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41 elseif (nargin >= nargout) |
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42 n = max ([nargin, 2]); |
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43 else |
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44 error ("ndgrid: wrong number of input arguments"); |
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45 endif |
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46 |
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47 ## Determine the size of the output arguments |
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48 |
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49 shape = zeros (1, n); |
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50 |
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51 for i = 1:n |
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52 if (! isvector (varargin{i})) |
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53 error ("ndgrid: arguments must be vectors"); |
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54 endif |
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55 |
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56 shape(i) = length (varargin{i}); |
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57 endfor |
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58 |
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59 for i = 1:n |
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60 ## size for reshape |
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61 r = ones (1, n); |
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62 r(i) = shape(i); |
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63 |
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64 ## size for repmat |
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65 s = shape; |
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66 s(i) = 1; |
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67 |
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68 varargout{i} = repmat (reshape (varargin{i}, r), s); |
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69 endfor |
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70 |
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71 endfunction |
