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1 ## Copyright (C) 2005 Laurent Mazet |
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2 ## |
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3 ## This program is free software; you can redistribute it and/or modify |
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4 ## it under the terms of the GNU General Public License as published by |
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5 ## the Free Software Foundation; either version 2 of the License, or |
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6 ## (at your option) any later version. |
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7 ## |
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8 ## This program is distributed in the hope that it will be useful, |
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9 ## but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 ## GNU General Public License for more details. |
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12 ## |
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13 ## You should have received a copy of the GNU General Public License |
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14 ## along with this program; if not, write to the Free Software |
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15 ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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16 |
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17 ## -*- texinfo -*- |
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18 ## @deftypefn {Function File} {@var{m} =} cell2mat (@var{c}) |
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19 ## Convert the cell array @var{c} into a matrix by concatenating all |
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20 ## elements of @var{c} into a hyperrectangle. Elements of @var{c} must |
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21 ## be numeric, logical or char, and @code{cat} must be able to |
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22 ## concatenate them together. |
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23 ## @seealso{mat2cell, num2cell} |
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24 ## @end deftypefn |
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25 |
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26 function m = cell2mat (c) |
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27 |
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28 if (nargin != 1) |
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29 usage ("m = cell2mat (c)"); |
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30 endif |
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31 |
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32 if (! iscell (c)) |
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33 error ("cell2mat: c is not a cell array"); |
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34 endif |
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35 |
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36 nb = numel (c); |
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37 |
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38 if (nb == 0) |
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39 m = []; |
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40 elseif (nb == 1) |
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41 elt = c{1}; |
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42 if (isnumeric (elt) || ischar (elt) || islogical (elt)) |
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43 m = elt; |
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44 elseif (iscell (elt)) |
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45 m = cell2mat (elt); |
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46 else |
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47 error ("cell2mat: all elements of cell array must be numeric, logical or char"); |
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48 endif |
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49 else |
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50 ## n dimensions case |
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51 for k = ndims (c):-1:2, |
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52 sz = size (c); |
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53 sz(end) = 1; |
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54 c1 = cell (sz); |
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55 for i = 1:(prod (sz)) |
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56 c1{i} = cat (k, c{i:(prod (sz)):end}); |
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57 endfor |
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58 c = c1; |
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59 endfor |
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60 m = cat (1, c1{:}); |
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61 endif |
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62 |
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63 endfunction |
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64 |
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65 ## Tests |
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66 %!shared C, D, E, F |
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67 %! C = {[1], [2 3 4]; [5; 9], [6 7 8; 10 11 12]}; |
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68 %! D = C; D(:,:,2) = C; |
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69 %! E = [1 2 3 4; 5 6 7 8; 9 10 11 12]; |
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70 %! F = E; F(:,:,2) = E; |
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71 %!assert (cell2mat (C), E); |
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72 %!test |
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73 %! if ([1e6,1e4,1] * str2num (split (version, '.')) > 2010064) |
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74 %! assert (cell2mat (D), F); % crashes octave 2.1.64 |
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75 %! endif |
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76 ## Demos |
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77 %!demo |
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78 %! C = {[1], [2 3 4]; [5; 9], [6 7 8; 10 11 12]}; |
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79 %! cell2mat (C) |
