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1 ## Copyright (C) 1999,2000 Kai Habel |
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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 {Loadable Function} {@var{T} =} delaunay3 (@var{x}, @var{y}, @var{z}) |
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22 ## @deftypefnx {Loadable Function} {@var{T} =} delaunay3 (@var{x}, @var{y}, @var{z}, @var{opt}) |
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23 ## A matrix of size [n, 4] is returned. Each row contains a |
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24 ## set of tetrahedron which are |
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25 ## described by the indices to the data point vectors (x,y,z). |
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26 ## |
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27 ## A fourth optional argument, which must be a string or cell array of strings, |
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28 ## contains extra options passed to the underlying qhull command. See the |
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29 ## documentation for the Qhull library for details. |
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30 ## @seealso{delaunay,delaunayn} |
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31 ## @end deftypefn |
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32 |
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33 ## Author: Kai Habel <kai.habel@gmx.de> |
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34 |
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35 function tetr = delaunay3 (x, y, z, opt) |
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36 |
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37 if (nargin != 3 && nargin != 4) |
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38 print_usage (); |
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39 endif |
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40 |
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41 if (isvector (x) && isvector (y) &&isvector (z) |
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42 && length (x) == length (y) && length(x) == length (z)) |
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43 if (nargin == 3) |
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44 tetr = delaunayn ([x(:), y(:), z(:)]); |
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45 elseif (ischar (opt) || iscell (opt)) |
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46 tetr = delaunayn ([x(:), y(:), z(:)], opt); |
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47 else |
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48 error ("delaunay3: fourth argument must be a string or cell array of strings"); |
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49 endif |
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50 else |
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51 error ("delaunay3: first three input arguments must be vectors of same size"); |
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52 endif |
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53 |
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54 endfunction |
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55 |
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56 %!test |
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57 %! x = [-1, -1, 1, 0, -1]; y = [-1, 1, 1, 0, -1]; z = [0, 0, 0, 1, 1]; |
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58 %! assert (sortrows (sort (delaunay3 (x, y, z), 2)), [1,2,3,4;1,2,4,5]) |
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59 |
