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1 ## Copyright (C) 2007 David Bateman |
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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 3 of the License, or (at |
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8 ## your option) 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, see |
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17 ## <http://www.gnu.org/licenses/>. |
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18 |
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19 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File} {@var{vi} =} griddata3 (@var{x}, @var{y}, @var{z}, @var{v} @var{xi}, @var{yi}, @var{zi}, @var{method}, @var{options}) |
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21 ## |
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22 ## Generate a regular mesh from irregular data using interpolation. |
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23 ## The function is defined by @code{@var{y} = f (@var{x},@var{y},@var{z})}. |
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24 ## The interpolation points are all @var{xi}. |
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25 ## |
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26 ## The interpolation method can be @code{"nearest"} or @code{"linear"}. |
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27 ## If method is omitted it defaults to @code{"linear"}. |
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28 ## @seealso{griddata, delaunayn} |
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29 ## @end deftypefn |
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30 |
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31 ## Author: David Bateman <dbateman@free.fr> |
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32 |
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33 function [yi] = griddata3 (x, y, z,v, xi, yi, zi, method, varargin) |
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34 |
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35 if (nargin < 7) |
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36 print_usage (); |
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37 endif |
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38 |
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39 if (!all (size (x) == size (y) & size (x) == size(z) & size(x) == size (v))) |
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40 error ("griddata3: x, y, z, and v must be vectors of same length"); |
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41 endif |
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42 |
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43 ## meshgrid xi, yi and zi if they are vectors unless they |
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44 ## are vectors of the same length |
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45 if (isvector (xi) && isvector (yi) && isvector (zi) |
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46 && (numel (xi) != numel (yi) || numel (xi) != numel (zi))) |
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47 [xi, yi, zi] = meshgrid (xi, yi, zi); |
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48 endif |
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49 |
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50 if (any (size(xi) != size(yi)) || any (size(xi) != size(zi))) |
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51 error ("griddata: xi, yi and zi must be vectors or matrices of same size"); |
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52 endif |
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53 |
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54 vi = griddata ([x(:), y(:), z(:)], v(:), [xi(:), yi(:), zi(:)], varargin{:}); |
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55 vi = reshape (vi, size (xi)); |
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56 endfunction |
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57 |
