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1 # Copyright (C) 1993, 1994, 1995 John W. Eaton |
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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 the |
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7 # Free Software Foundation; either version 2, or (at your option) any |
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8 # later version. |
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9 # |
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10 # Octave is distributed in the hope that it will be useful, but WITHOUT |
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11 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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12 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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13 # 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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18 |
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19 function y = rot90 (x, k) |
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20 |
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21 # usage: rot90 (x, k) |
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22 # |
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23 # Rotate the matrix x counterclockwise k*90 degrees. |
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24 # |
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25 # If the second argument is omitted, k is taken to be 1. |
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26 # |
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27 # See also: flipud, fliplr |
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28 |
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29 if (nargin < 2) |
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30 k = 1; |
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31 endif |
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32 |
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33 if (imag (k) != 0 || fix (k) != k) |
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34 error ("rot90: k must be an integer"); |
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35 endif |
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36 |
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37 if (nargin == 1 || nargin == 2) |
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38 k = rem (k, 4); |
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39 if (k < 0) |
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40 k = k + 4; |
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41 endif |
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42 if (k == 0) |
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43 y = x; |
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44 elseif (k == 1) |
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45 y = flipud (x'); |
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46 elseif (k == 2) |
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47 y = flipud (fliplr (x)); |
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48 elseif (k == 3) |
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49 y = (flipud (x))'; |
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50 else |
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51 error ("rot90: internal error!"); |
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52 endif |
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53 else |
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54 usage ("rot90 (x [, k])"); |
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55 endif |
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56 |
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57 endfunction |
