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author Rik <code@nomad.inbox5.com>
date Fri, 23 Apr 2010 11:28:50 -0700
parents 16f53d29049f
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John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 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{y} =} circshift (@var{x}, @var{n})
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21 ## Circularly shifts the values of the array @var{x}. @var{n} must be
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22 ## a vector of integers no longer than the number of dimensions in
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23 ## @var{x}. The values of @var{n} can be either positive or negative,
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24 ## which determines the direction in which the values or @var{x} are
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25 ## shifted. If an element of @var{n} is zero, then the corresponding
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26 ## dimension of @var{x} will not be shifted. For example
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27 ##
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28 ## @example
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29 ## @group
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30 ## x = [1, 2, 3; 4, 5, 6; 7, 8, 9];
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31 ## circshift (x, 1)
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32 ## @result{} 7, 8, 9
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33 ## 1, 2, 3
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34 ## 4, 5, 6
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35 ## circshift (x, -2)
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36 ## @result{} 7, 8, 9
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37 ## 1, 2, 3
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38 ## 4, 5, 6
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39 ## circshift (x, [0,1])
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40 ## @result{} 3, 1, 2
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41 ## 6, 4, 5
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42 ## 9, 7, 8
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43 ## @end group
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44 ## @end example
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45 ## @seealso {permute, ipermute, shiftdim}
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46 ## @end deftypefn
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47
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48 function y = circshift (x, n)
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49
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50 if (nargin == 2)
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51 if (isempty (x))
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52 y = x;
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53 else
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54 nd = ndims (x);
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55 sz = size (x);
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56
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57 if (! isvector (n) && length (n) > nd)
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58 error ("circshift: n must be a vector, no longer than the number of dimension in x");
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59 endif
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60
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61 if (any (n != floor (n)))
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62 error ("circshift: all values of n must be integers");
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63 endif
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64
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65 idx = cell ();
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66 for i = 1:length (n);
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67 nn = n(i);
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68 if (nn < 0)
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69 while (sz(i) <= -nn)
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70 nn = nn + sz(i);
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71 endwhile
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72 idx{i} = [(1-nn):sz(i), 1:-nn];
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73 else
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74 while (sz(i) <= nn)
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75 nn = nn - sz(i);
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76 endwhile
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77 idx{i} = [(sz(i)-nn+1):sz(i), 1:(sz(i)-nn)];
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78 endif
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79 endfor
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80 for i = (length(n) + 1) : nd
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81 idx{i} = 1:sz(i);
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82 endfor
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83 y = x(idx{:});
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84 endif
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85 else
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86 print_usage ();
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87 endif
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88 endfunction
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89
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90 %!shared x
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91 %! x = [1, 2, 3; 4, 5, 6; 7, 8, 9];
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92
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93 %!assert (circshift (x, 1), [7, 8, 9; 1, 2, 3; 4, 5, 6])
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94 %!assert (circshift (x, -2), [7, 8, 9; 1, 2, 3; 4, 5, 6])
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95 %!assert (circshift (x, [0, 1]), [3, 1, 2; 6, 4, 5; 9, 7, 8]);
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96 %!assert (circshift ([],1), [])