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1 ## Copyright (C) 1993, 1994, 1995, 1996, 1997, 1999, 2000, 2004, 2005, |
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2 ## 2006, 2007 John W. Eaton |
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3 ## |
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4 ## This file is part of Octave. |
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5 ## |
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6 ## Octave is free software; you can redistribute it and/or modify it |
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7 ## under the terms of the GNU General Public License as published by |
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8 ## the Free Software Foundation; either version 3 of the License, or (at |
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9 ## your option) any later version. |
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10 ## |
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11 ## Octave is distributed in the hope that it will be useful, but |
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 ## General Public License for more details. |
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15 ## |
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16 ## You should have received a copy of the GNU General Public License |
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17 ## along with Octave; see the file COPYING. If not, see |
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18 ## <http://www.gnu.org/licenses/>. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} flipud (@var{x}) |
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22 ## Return a copy of @var{x} with the order of the rows reversed. For |
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23 ## example, |
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24 ## |
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25 ## @example |
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26 ## @group |
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27 ## flipud ([1, 2; 3, 4]) |
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28 ## @result{} 3 4 |
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29 ## 1 2 |
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30 ## @end group |
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31 ## @end example |
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32 ## |
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33 ## Due to the difficulty of defining which axis about which to flip the |
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34 ## matrix @code{flipud} only work with 2-d arrays. To flip N-d arrays |
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35 ## use @code{flipdim} instead. |
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36 ## @seealso{fliplr, flipdim, rot90, rotdim} |
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37 ## @end deftypefn |
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38 |
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39 ## Author: jwe |
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40 |
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41 function y = flipud (x) |
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42 |
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43 if (nargin != 1) |
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44 print_usage (); |
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45 endif |
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46 |
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47 if (ndims (x) > 2) |
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48 error ("flipud: Only works with 2-d arrays") |
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49 endif |
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50 |
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51 nr = rows (x); |
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52 y = x (nr:-1:1, :); |
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53 |
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54 endfunction |
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55 |
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56 %!assert((flipud ([1, 2; 3, 4]) == [3, 4; 1, 2] |
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57 %! && flipud ([1, 2; 3, 4; 5, 6]) == [5, 6; 3, 4; 1, 2] |
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58 %! && flipud ([1, 2, 3; 4, 5, 6]) == [4, 5, 6; 1, 2, 3])); |
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59 |
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60 %!error flipud (); |
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61 |
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62 %!error flipud (1, 2); |
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63 |
