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annotate scripts/signal/ifftshift.m @ 20788:7374a3a6d594

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use new string_value method to handle value extraction errors * urlwrite.cc: Use new string_value method.
author John W. Eaton <jwe@octave.org>
date Thu, 08 Oct 2015 17:26:40 -0400
parents abbe33bf0c74
children
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rev   line source
19898
4197fc428c7d maint: Update copyright notices for 2015.
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1 ## Copyright (C) 1997-2015 Vincent Cautaerts
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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} {} ifftshift (@var{x})
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21 ## @deftypefnx {Function File} {} ifftshift (@var{x}, @var{dim})
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22 ## Undo the action of the @code{fftshift} function.
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23 ##
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24 ## For even length @var{x}, @code{fftshift} is its own inverse, but odd lengths
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25 ## differ slightly.
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26 ## @seealso{fftshift}
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27 ## @end deftypefn
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28
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29 ## Author: Vincent Cautaerts <vincent@comf5.comm.eng.osaka-u.ac.jp>
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30 ## Created: July 1997
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31 ## Adapted-By: jwe
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32 ## Modified-By: Paul Kienzle, converted from fftshift
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33 ## Modified-By: David Bateman, add NDArray capability and option dim arg
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34
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35 function retval = ifftshift (x, dim)
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36
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37 if (nargin != 1 && nargin != 2)
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38 print_usage ();
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39 endif
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40
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41 if (! (isnumeric (x) || islogical (x) || ischar (x)))
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42 error ("ifftshift: X must be a vector or matrix");
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43 endif
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44
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45 if (nargin == 2)
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46 if (! (isscalar (dim) && dim > 0 && dim == fix (dim)))
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47 error ("ifftshift: dimension DIM must be a positive integer");
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48 endif
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49 nd = ndims (x);
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50 sz = size (x);
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51 sz2 = floor (sz(dim) / 2);
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52 idx = repmat ({':'}, nd, 1);
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53 idx{dim} = [sz2+1:sz(dim), 1:sz2];
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54 retval = x(idx{:});
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55 else
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56 if (isvector (x))
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57 xl = length (x);
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58 xx = floor (xl/2);
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59 retval = x([xx+1:xl, 1:xx]);
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60 else
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61 nd = ndims (x);
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62 sz = size (x);
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63 sz2 = floor (sz ./ 2);
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64 idx = cell ();
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65 for i = 1:nd
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66 idx{i} = [sz2(i)+1:sz(i), 1:sz2(i)];
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67 endfor
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68 retval = x(idx{:});
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69 endif
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70 endif
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71
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72 endfunction
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73
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74
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75 %!test
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76 %! x = [0:7];
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77 %! y = ifftshift (x);
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78 %! assert (y, [4 5 6 7 0 1 2 3]);
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79 %! assert (ifftshift (y), x);
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80
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81 %!test
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82 %! x = [0:6];
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83 %! y = ifftshift (x);
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84 %! assert (y, [3 4 5 6 0 1 2]);
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85 %! assert (ifftshift (y), [6 0 1 2 3 4 5]);
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86
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87 %!test
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88 %! x = [0:7]';
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89 %! y = ifftshift (x);
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90 %! assert (y, [4;5;6;7;0;1;2;3]);
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91 %! assert (ifftshift (y), x);
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92
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93 %!test
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94 %! x = [0:6]';
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95 %! y = ifftshift (x);
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96 %! assert (y, [3;4;5;6;0;1;2]);
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97 %! assert (ifftshift (y), [6;0;1;2;3;4;5]);
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98
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99 %!test
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100 %! x = [0:3];
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101 %! x = [x;2*x;3*x+1;4*x+1];
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102 %! y = ifftshift (x);
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103 %! assert (y, [[7 10 1 4];[9 13 1 5];[2 3 0 1];[4 6 0 2]]);
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104 %! assert (ifftshift (y), x);
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105
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106 %!test
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107 %! x = [0:3];
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108 %! x = [x;2*x;3*x+1;4*x+1];
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109 %! y = ifftshift (x,1);
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110 %! assert (y, [[1 4 7 10];[1 5 9 13];[0 1 2 3];[0 2 4 6]]);
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111 %! assert (ifftshift (y,1), x);
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112
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113 %!test
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114 %! x = [0:3];
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115 %! x = [x;2*x;3*x+1;4*x+1];
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116 %! y = ifftshift (x,2);
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117 %! assert (y, [[2 3 0 1];[4 6 0 2];[7 10 1 4];[9 13 1 5]]);
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118 %! assert (ifftshift (y,2), x);
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119
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120 %!test
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121 %! x = "efgabcd";
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122 %! y = ifftshift (x);
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123 %! assert (y, "abcdefg");
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124 %! assert (ifftshift (y), "defgabc");
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125
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126 ## Test N-dimensional input (bug #45207)
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127 %!test
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128 %! x = [0:3];
abbe33bf0c74 fftshift.m, ifftshift.m: Restore support for N-dimensional arrays (bug #45207)
Mike Miller <mtmiller@octave.org>
parents: 20375
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129 %! x = x + x' + reshape (x, [1 1 4]);
abbe33bf0c74 fftshift.m, ifftshift.m: Restore support for N-dimensional arrays (bug #45207)
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parents: 20375
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130 %! y1 = [4 5 2 3; 5 6 3 4; 2 3 0 1; 3 4 1 2];
abbe33bf0c74 fftshift.m, ifftshift.m: Restore support for N-dimensional arrays (bug #45207)
Mike Miller <mtmiller@octave.org>
parents: 20375
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131 %! y = ifftshift (x);
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Mike Miller <mtmiller@octave.org>
parents: 20375
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132 %! assert (y, reshape ([y1 + 2, y1 + 3, y1, y1 + 1], [4 4 4]));
abbe33bf0c74 fftshift.m, ifftshift.m: Restore support for N-dimensional arrays (bug #45207)
Mike Miller <mtmiller@octave.org>
parents: 20375
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133 %! assert (ifftshift (y), x);
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Mike Miller <mtmiller@octave.org>
parents: 20375
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134
abbe33bf0c74 fftshift.m, ifftshift.m: Restore support for N-dimensional arrays (bug #45207)
Mike Miller <mtmiller@octave.org>
parents: 20375
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135 %% Test input validation
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Mike Miller <mtmiller@octave.org>
parents: 20375
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136 %!error ifftshift ()
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Mike Miller <mtmiller@octave.org>
parents: 20375
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137 %!error ifftshift (1, 2, 3)
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Mike Miller <mtmiller@octave.org>
parents: 20375
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138 %!error ifftshift (0:3, -1)
abbe33bf0c74 fftshift.m, ifftshift.m: Restore support for N-dimensional arrays (bug #45207)
Mike Miller <mtmiller@octave.org>
parents: 20375
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139 %!error ifftshift (0:3, 0:3)
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Mike Miller <mtmiller@octave.org>
parents: 20375
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140