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annotate scripts/general/circshift.m @ 14872:c2dbdeaa25df

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maint: use rows() and columns() to clarify m-files. * gradient.m, interp1q.m, rat.m, tsearchn.m, image.m, imwrite.m, area.m, contourc.m, hist.m, isocolors.m, isonormals.m, meshz.m, print.m, __bar__.m, __go_draw_axes__.m, __interp_cube__.m, __marching_cube__.m, __patch__.m, __print_parse_opts__.m, __quiver__.m, rose.m, shrinkfaces.m, stairs.m, surfnorm.m, tetramesh.m, text.m, deconv.m, spline.m, intersect.m, setdiff.m, setxor.m, union.m, periodogram.m, pcg.m, perms.m: Replace size (x,1) with rows (x) and size(x,2) with columns(x).
author Rik <octave@nomad.inbox5.com>
date Tue, 17 Jul 2012 13:34:19 -0700
parents f3d52523cde1
children
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rev   line source
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72c96de7a403 maint: update copyright notices for 2012
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 2004-2012 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 shift 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 print_usage ();
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52 endif
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53
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54 if (isempty (x))
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55 y = x;
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56 return;
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57 endif
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58
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59 nd = ndims (x);
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60 sz = size (x);
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61
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62 if (! isvector (n) || length (n) > nd)
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63 error ("circshift: N must be a vector, no longer than the number of dimension in X");
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64 elseif (any (n != fix (n)))
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65 error ("circshift: all values of N must be integers");
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66 endif
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67
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68 idx = repmat ({':'}, 1, nd);
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69 for i = 1:length (n);
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70 b = n(i);
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71 d = sz(i);
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72 if (b > 0)
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73 b = rem (b, d);
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74 idx{i} = [d-b+1:d, 1:d-b];
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75 elseif (b < 0)
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76 b = rem (abs (b), d);
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77 idx{i} = [b+1:d, 1:b];
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78 endif
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79 endfor
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80
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81 y = x(idx{:});
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82
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83 endfunction
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84
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85
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86 %!shared x
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87 %! x = [1, 2, 3; 4, 5, 6; 7, 8, 9];
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88
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89 %!assert (circshift (x, 1), [7, 8, 9; 1, 2, 3; 4, 5, 6])
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90 %!assert (circshift (x, -2), [7, 8, 9; 1, 2, 3; 4, 5, 6])
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91 %!assert (circshift (x, [0, 1]), [3, 1, 2; 6, 4, 5; 9, 7, 8])
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92 %!assert (circshift ([], 1), [])
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93
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94 %!assert (circshift (eye (3), 1), circshift (eye (3), 1))
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95 %!assert (circshift (eye (3), 1), [0,0,1;1,0,0;0,1,0])
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96
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97 %% Test input validation
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98 %!error circshift ()
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99 %!error circshift (1)
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100 %!error circshift (1,2,3)
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101 %!error circshift (1, ones (2,2))
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102 %!error circshift (1, [1 2 3])
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103 %!error circshift (1, 1.5)
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104