annotate scripts/signal/ifftshift.m @ 28886:d8318c12d903

test: remove unnecessary BIST tests in m-files checking for excessive number of inputs. Remove BIST tests now that interpreter enforces calling function with no more than the number of arguments defined in the function prototype. * makeUniqueStrings.m, makeValidName.m, base64decode.m, base64encode.m, record.m, sound.m, soundsc.m, acosd.m, acot.m, acotd.m, acoth.m, acsc.m, acscd.m, acsch.m, asec.m, asecd.m, asech.m, asind.m, atan2d.m, atand.m, cosd.m, cot.m, cotd.m, coth.m, csc.m, cscd.m, csch.m, sec.m, secd.m, sech.m, sind.m, tand.m, accumdim.m, bincoeff.m, bitget.m, bitset.m, cell2mat.m, circshift.m, cplxpair.m, cumtrapz.m, deg2rad.m, flip.m, fliplr.m, flipud.m, int2str.m, interpft.m, logspace.m, num2str.m, postpad.m, prepad.m, rad2deg.m, rot90.m, rotdim.m, shift.m, subsindex.m, trapz.m, rotx.m, roty.m, rotz.m, getappdata.m, getpixelposition.m, guidata.m, isappdata.m, waitforbuttonpress.m, __gripe_missing_component__.m, bessel.m, hsv2rgb.m, ind2gray.m, rgb2gray.m, rgb2hsv.m, rgbplot.m, fileread.m, javachk.m, usejava.m, findstr.m, genvarname.m, isdir.m, vectorize.m, cond.m, cross.m, duplication_matrix.m, expm.m, isbanded.m, isdefinite.m, isdiag.m, ishermitian.m, issymmetric.m, istril.m, istriu.m, trace.m, vech.m, vecnorm.m, cast.m, citation.m, compare_versions.m, grabcode.m, inputname.m, isfile.m, isfolder.m, ismac.m, ispc.m, isunix.m, list_primes.m, methods.m, news.m, open.m, run.m, swapbytes.m, tar.m, verLessThan.m, zip.m, odeget.m, optimget.m, stemleaf.m, allchild.m, ancestor.m, close.m, groot.m, hgsave.m, isaxes.m, isfigure.m, isgraphics.m, ishandle.m, isprop.m, linkaxes.m, rotate.m, saveas.m, conv.m, poly.m, polyint.m, polyreduce.m, ppval.m, roots.m, addpref.m, getpref.m, ispref.m, rmpref.m, setpref.m, profile.m, profshow.m, powerset.m, autoreg_matrix.m, bartlett.m, blackman.m, detrend.m, fftconv.m, fftfilt.m, fftshift.m, hamming.m, hanning.m, ifftshift.m, sinewave.m, spectral_adf.m, spectral_xdf.m, unwrap.m, nonzeros.m, spconvert.m, sprand.m, sprandn.m, beta.m, betainc.m, betaln.m, cosint.m, expint.m, factorial.m, legendre.m, nchoosek.m, nthroot.m, perms.m, pow2.m, primes.m, reallog.m, realpow.m, realsqrt.m, sinint.m, hankel.m, hilb.m, invhilb.m, magic.m, pascal.m, toeplitz.m, vander.m, wilkinson.m, center.m, corr.m, cov.m, discrete_cdf.m, discrete_inv.m, discrete_pdf.m, empirical_cdf.m, empirical_inv.m, empirical_pdf.m, iqr.m, kendall.m, kurtosis.m, mad.m, meansq.m, median.m, moment.m, prctile.m, quantile.m, range.m, run_count.m, skewness.m, spearman.m, statistics.m, std.m, var.m, base2dec.m, bin2dec.m, blanks.m, dec2base.m, dec2bin.m, dec2hex.m, endsWith.m, erase.m, hex2dec.m, index.m, isletter.m, isstring.m, isstrprop.m, mat2str.m, ostrsplit.m, rindex.m, startsWith.m, strtrunc.m, substr.m, fail.m, addtodate.m, asctime.m, ctime.m, date.m, datestr.m, eomday.m, etime.m, is_leap_year.m, now.m: remove unnecessary BIST tests in m-files checking for excessive number of inputs.
author Rik <rik@octave.org>
date Fri, 09 Oct 2020 13:28:53 -0700
parents b09432b20a84
children de5f2f9a64ff
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1 ########################################################################
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2 ##
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3 ## Copyright (C) 1997-2020 The Octave Project Developers
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4 ##
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5 ## See the file COPYRIGHT.md in the top-level directory of this
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6 ## distribution or <https://octave.org/copyright/>.
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7 ##
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8 ## This file is part of Octave.
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9 ##
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10 ## Octave is free software: you can redistribute it and/or modify it
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11 ## under the terms of the GNU General Public License as published by
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12 ## the Free Software Foundation, either version 3 of the License, or
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13 ## (at your option) any later version.
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14 ##
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15 ## Octave is distributed in the hope that it will be useful, but
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16 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 ## GNU General Public License for more details.
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19 ##
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20 ## You should have received a copy of the GNU General Public License
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21 ## along with Octave; see the file COPYING. If not, see
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22 ## <https://www.gnu.org/licenses/>.
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23 ##
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24 ########################################################################
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25
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26 ## -*- texinfo -*-
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27 ## @deftypefn {} {} ifftshift (@var{x})
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28 ## @deftypefnx {} {} ifftshift (@var{x}, @var{dim})
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29 ## Undo the action of the @code{fftshift} function.
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30 ##
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31 ## For even length @var{x}, @code{fftshift} is its own inverse, but odd lengths
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32 ## differ slightly.
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33 ## @seealso{fftshift}
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34 ## @end deftypefn
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35
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36 function retval = ifftshift (x, dim)
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37
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38 if (nargin != 1 && nargin != 2)
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39 print_usage ();
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40 endif
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41
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42 if (! (isnumeric (x) || islogical (x) || ischar (x)))
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43 error ("ifftshift: X must be a vector or matrix");
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44 endif
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45
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46 if (nargin == 2)
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47 if (! (isscalar (dim) && dim > 0 && dim == fix (dim)))
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48 error ("ifftshift: dimension DIM must be a positive integer");
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49 endif
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50 nd = ndims (x);
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51 sz = size (x);
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52 sz2 = floor (sz(dim) / 2);
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53 idx = repmat ({':'}, nd, 1);
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54 idx{dim} = [sz2+1:sz(dim), 1:sz2];
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55 retval = x(idx{:});
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56 else
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57 if (isvector (x))
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58 xl = length (x);
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59 xx = floor (xl/2);
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60 retval = x([xx+1:xl, 1:xx]);
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61 else
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62 nd = ndims (x);
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63 sz = size (x);
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64 sz2 = floor (sz ./ 2);
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65 idx = cell ();
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66 for i = 1:nd
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67 idx{i} = [sz2(i)+1:sz(i), 1:sz2(i)];
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68 endfor
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69 retval = x(idx{:});
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70 endif
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71 endif
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72
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73 endfunction
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74
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75
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76 %!test
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77 %! x = [0:7];
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78 %! y = ifftshift (x);
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79 %! assert (y, [4 5 6 7 0 1 2 3]);
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80 %! assert (ifftshift (y), x);
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81
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82 %!test
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83 %! x = [0:6];
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84 %! y = ifftshift (x);
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85 %! assert (y, [3 4 5 6 0 1 2]);
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86 %! assert (ifftshift (y), [6 0 1 2 3 4 5]);
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87
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88 %!test
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89 %! x = [0:7]';
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90 %! y = ifftshift (x);
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91 %! assert (y, [4;5;6;7;0;1;2;3]);
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92 %! assert (ifftshift (y), x);
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93
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94 %!test
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95 %! x = [0:6]';
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96 %! y = ifftshift (x);
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97 %! assert (y, [3;4;5;6;0;1;2]);
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98 %! assert (ifftshift (y), [6;0;1;2;3;4;5]);
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99
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100 %!test
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101 %! x = [0:3];
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102 %! x = [x;2*x;3*x+1;4*x+1];
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103 %! y = ifftshift (x);
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104 %! assert (y, [[7 10 1 4];[9 13 1 5];[2 3 0 1];[4 6 0 2]]);
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105 %! assert (ifftshift (y), x);
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106
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107 %!test
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108 %! x = [0:3];
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109 %! x = [x;2*x;3*x+1;4*x+1];
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110 %! y = ifftshift (x,1);
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111 %! assert (y, [[1 4 7 10];[1 5 9 13];[0 1 2 3];[0 2 4 6]]);
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112 %! assert (ifftshift (y,1), x);
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Robert T. Short <octave@phaselockedsystems.com.com>
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113
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parents: 12536
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114 %!test
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115 %! x = [0:3];
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116 %! x = [x;2*x;3*x+1;4*x+1];
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Rik <octave@nomad.inbox5.com>
parents: 14138
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117 %! y = ifftshift (x,2);
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parents: 14138
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118 %! assert (y, [[2 3 0 1];[4 6 0 2];[7 10 1 4];[9 13 1 5]]);
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Rik <octave@nomad.inbox5.com>
parents: 14138
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119 %! assert (ifftshift (y,2), x);
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parents: 12536
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120
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Mike Miller <mtmiller@octave.org>
parents: 20165
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121 %!test
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122 %! x = "efgabcd";
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parents: 20165
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123 %! y = ifftshift (x);
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parents: 20165
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124 %! assert (y, "abcdefg");
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parents: 20165
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125 %! assert (ifftshift (y), "defgabc");
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126
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Rik <rik@octave.org>
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127 ## Test N-dimensional input
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John W. Eaton <jwe@octave.org>
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128 %!test <*45207>
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129 %! x = [0:3];
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parents: 20165
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130 %! x = x + x' + reshape (x, [1 1 4]);
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parents: 20165
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131 %! y1 = [4 5 2 3; 5 6 3 4; 2 3 0 1; 3 4 1 2];
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132 %! y = ifftshift (x);
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133 %! assert (y, reshape ([y1 + 2, y1 + 3, y1, y1 + 1], [4 4 4]));
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134 %! assert (ifftshift (y), x);
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Mike Miller <mtmiller@octave.org>
parents: 20165
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135
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John W. Eaton <jwe@octave.org>
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136 ## Test input validation
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Rik <rik@octave.org>
parents: 27984
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137 %!error <Invalid call> ifftshift ()
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Mike Miller <mtmiller@octave.org>
parents: 20165
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138 %!error ifftshift (0:3, -1)
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parents: 20165
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139 %!error ifftshift (0:3, 0:3)