Mercurial > octave
annotate libinterp/corefcn/fft2.cc @ 20853:1142cf6abc0d
2015 Code Sprint: remove class of function from docstring for all C++ files.
author | Rik <rik@octave.org> |
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date | Sat, 12 Dec 2015 07:40:03 -0800 |
parents | 8bb38ba1bad6 |
children | 6f0bd96f93c0 |
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2928 | 1 /* |
2 | |
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3 Copyright (C) 1997-2015 David Bateman |
11523 | 4 Copyright (C) 1996-1997 John W. Eaton |
2928 | 5 |
6 This file is part of Octave. | |
7 | |
8 Octave is free software; you can redistribute it and/or modify it | |
9 under the terms of the GNU General Public License as published by the | |
7016 | 10 Free Software Foundation; either version 3 of the License, or (at your |
11 option) any later version. | |
2928 | 12 |
13 Octave is distributed in the hope that it will be useful, but WITHOUT | |
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 for more details. | |
17 | |
18 You should have received a copy of the GNU General Public License | |
7016 | 19 along with Octave; see the file COPYING. If not, see |
20 <http://www.gnu.org/licenses/>. | |
2928 | 21 |
22 */ | |
23 | |
24 #ifdef HAVE_CONFIG_H | |
25 #include <config.h> | |
26 #endif | |
27 | |
28 #include "lo-mappers.h" | |
29 | |
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30 #include "defun.h" |
2928 | 31 #include "error.h" |
32 #include "gripes.h" | |
33 #include "oct-obj.h" | |
34 #include "utils.h" | |
35 | |
4773 | 36 // This function should be merged with Fifft. |
2928 | 37 |
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38 #if defined (HAVE_FFTW) |
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39 #define FFTSRC "@sc{fftw}" |
4773 | 40 #else |
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41 #define FFTSRC "@sc{fftpack}" |
4773 | 42 #endif |
43 | |
44 static octave_value | |
45 do_fft2 (const octave_value_list &args, const char *fcn, int type) | |
2928 | 46 { |
4233 | 47 octave_value retval; |
2928 | 48 |
49 int nargin = args.length (); | |
50 | |
51 if (nargin < 1 || nargin > 3) | |
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52 print_usage (); |
2928 | 53 |
54 octave_value arg = args(0); | |
4773 | 55 dim_vector dims = arg.dims (); |
5275 | 56 octave_idx_type n_rows = -1; |
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57 |
2928 | 58 if (nargin > 1) |
59 { | |
60 double dval = args(1).double_value (); | |
61 if (xisnan (dval)) | |
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62 error ("%s: number of rows (N) cannot be NaN", fcn); |
2928 | 63 else |
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64 { |
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65 n_rows = NINTbig (dval); |
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66 if (n_rows < 0) |
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67 error ("%s: number of rows (N) must be greater than zero", fcn); |
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68 } |
2928 | 69 } |
70 | |
5275 | 71 octave_idx_type n_cols = -1; |
2928 | 72 if (nargin > 2) |
73 { | |
74 double dval = args(2).double_value (); | |
75 if (xisnan (dval)) | |
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76 error ("%s: number of columns (M) cannot be NaN", fcn); |
2928 | 77 else |
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78 { |
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79 n_cols = NINTbig (dval); |
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80 if (n_cols < 0) |
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81 error ("%s: number of columns (M) must be greater than zero", fcn); |
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82 } |
2928 | 83 } |
84 | |
4773 | 85 for (int i = 0; i < dims.length (); i++) |
86 if (dims(i) < 0) | |
2928 | 87 return retval; |
88 | |
4773 | 89 if (n_rows < 0) |
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90 n_rows = dims(0); |
4773 | 91 else |
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92 dims(0) = n_rows; |
2928 | 93 |
4773 | 94 if (n_cols < 0) |
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95 n_cols = dims(1); |
4773 | 96 else |
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97 dims(1) = n_cols; |
4773 | 98 |
99 if (dims.all_zero () || n_rows == 0 || n_cols == 0) | |
7924 | 100 { |
101 if (arg.is_single_type ()) | |
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102 return octave_value (FloatMatrix ()); |
7924 | 103 else |
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104 return octave_value (Matrix ()); |
7924 | 105 } |
2928 | 106 |
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107 if (arg.is_single_type ()) |
2928 | 108 { |
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109 if (arg.is_real_type ()) |
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110 { |
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111 FloatNDArray nda = arg.float_array_value (); |
2928 | 112 |
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113 nda.resize (dims, 0.0); |
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114 retval = (type != 0 ? nda.ifourier2d () : nda.fourier2d ()); |
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115 } |
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116 else |
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117 { |
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118 FloatComplexNDArray cnda = arg.float_complex_array_value (); |
2928 | 119 |
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120 cnda.resize (dims, 0.0); |
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121 retval = (type != 0 ? cnda.ifourier2d () : cnda.fourier2d ()); |
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122 } |
2928 | 123 } |
124 else | |
125 { | |
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126 if (arg.is_real_type ()) |
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127 { |
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128 NDArray nda = arg.array_value (); |
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129 |
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130 nda.resize (dims, 0.0); |
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131 retval = (type != 0 ? nda.ifourier2d () : nda.fourier2d ()); |
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132 } |
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133 else if (arg.is_complex_type ()) |
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134 { |
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135 ComplexNDArray cnda = arg.complex_array_value (); |
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136 |
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137 cnda.resize (dims, 0.0); |
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138 retval = (type != 0 ? cnda.ifourier2d () : cnda.fourier2d ()); |
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139 } |
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140 else |
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141 gripe_wrong_type_arg (fcn, arg); |
2928 | 142 } |
143 | |
144 return retval; | |
145 } | |
146 | |
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147 DEFUN (fft2, args, , |
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148 "-*- texinfo -*-\n\ |
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149 @deftypefn {} {} fft2 (@var{A})\n\ |
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150 @deftypefnx {} {} fft2 (@var{A}, @var{m}, @var{n})\n\ |
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151 Compute the two-dimensional discrete Fourier transform of @var{A} using\n\ |
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152 a Fast Fourier Transform (FFT) algorithm.\n\ |
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153 \n\ |
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154 The optional arguments @var{m} and @var{n} may be used specify the number of\n\ |
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155 rows and columns of @var{A} to use. If either of these is larger than the\n\ |
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156 size of @var{A}, @var{A} is resized and padded with zeros.\n\ |
4773 | 157 \n\ |
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158 If @var{A} is a multi-dimensional matrix, each two-dimensional sub-matrix\n\ |
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159 of @var{A} is treated separately.\n\ |
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160 @seealso{ifft2, fft, fftn, fftw}\n\ |
5642 | 161 @end deftypefn") |
4773 | 162 { |
4782 | 163 return do_fft2 (args, "fft2", 0); |
4773 | 164 } |
165 | |
166 | |
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167 DEFUN (ifft2, args, , |
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168 "-*- texinfo -*-\n\ |
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169 @deftypefn {} {} ifft2 (@var{A})\n\ |
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170 @deftypefnx {} {} ifft2 (@var{A}, @var{m}, @var{n})\n\ |
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171 Compute the inverse two-dimensional discrete Fourier transform of @var{A}\n\ |
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172 using a Fast Fourier Transform (FFT) algorithm.\n\ |
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173 \n\ |
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174 The optional arguments @var{m} and @var{n} may be used specify the number of\n\ |
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175 rows and columns of @var{A} to use. If either of these is larger than the\n\ |
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176 size of @var{A}, @var{A} is resized and padded with zeros.\n\ |
4773 | 177 \n\ |
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178 If @var{A} is a multi-dimensional matrix, each two-dimensional sub-matrix\n\ |
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179 of @var{A} is treated separately\n\ |
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180 @seealso{fft2, ifft, ifftn, fftw}\n\ |
5642 | 181 @end deftypefn") |
4773 | 182 { |
4782 | 183 return do_fft2 (args, "ifft2", 1); |
4773 | 184 } |
185 | |
2928 | 186 /* |
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187 %% Author: David Billinghurst (David.Billinghurst@riotinto.com.au) |
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188 %% Comalco Research and Technology |
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189 %% 02 May 2000 |
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190 %!test |
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191 %! M = 16; |
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192 %! N = 8; |
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193 %! |
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194 %! m = 5; |
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195 %! n = 3; |
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196 %! |
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197 %! x = 2*pi*(0:1:M-1)/M; |
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198 %! y = 2*pi*(0:1:N-1)/N; |
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199 %! sx = cos (m*x); |
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200 %! sy = sin (n*y); |
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201 %! s = kron (sx',sy); |
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202 %! S = fft2 (s); |
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203 %! answer = kron (fft (sx)', fft (sy)); |
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204 %! assert (S, answer, 4*M*N*eps); |
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205 |
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206 %% Author: David Billinghurst (David.Billinghurst@riotinto.com.au) |
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207 %% Comalco Research and Technology |
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208 %% 02 May 2000 |
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209 %!test |
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210 %! M = 12; |
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211 %! N = 7; |
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212 %! |
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213 %! m = 3; |
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214 %! n = 2; |
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215 %! |
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216 %! x = 2*pi*(0:1:M-1)/M; |
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217 %! y = 2*pi*(0:1:N-1)/N; |
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218 %! |
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219 %! sx = cos (m*x); |
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220 %! sy = cos (n*y); |
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221 %! |
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222 %! S = kron (fft (sx)', fft (sy)); |
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223 %! answer = kron (sx', sy); |
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224 %! s = ifft2 (S); |
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225 %! |
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226 %! assert (s, answer, 30*eps); |
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227 |
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228 |
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229 %% Author: David Billinghurst (David.Billinghurst@riotinto.com.au) |
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230 %% Comalco Research and Technology |
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231 %% 02 May 2000 |
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232 %!test |
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233 %! M = 16; |
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234 %! N = 8; |
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235 %! |
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236 %! m = 5; |
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237 %! n = 3; |
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238 %! |
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239 %! x = 2*pi*(0:1:M-1)/M; |
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240 %! y = 2*pi*(0:1:N-1)/N; |
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241 %! sx = single (cos (m*x)); |
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242 %! sy = single (sin (n*y)); |
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243 %! s = kron (sx', sy); |
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244 %! S = fft2 (s); |
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245 %! answer = kron (fft (sx)', fft (sy)); |
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246 %! assert (S, answer, 4*M*N*eps ("single")); |
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247 |
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248 %% Author: David Billinghurst (David.Billinghurst@riotinto.com.au) |
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249 %% Comalco Research and Technology |
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250 %% 02 May 2000 |
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251 %!test |
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252 %! M = 12; |
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253 %! N = 7; |
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254 %! |
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255 %! m = 3; |
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256 %! n = 2; |
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257 %! |
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258 %! x = single (2*pi*(0:1:M-1)/M); |
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259 %! y = single (2*pi*(0:1:N-1)/N); |
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260 %! |
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261 %! sx = cos (m*x); |
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262 %! sy = cos (n*y); |
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263 %! |
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264 %! S = kron (fft (sx)', fft (sy)); |
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265 %! answer = kron (sx', sy); |
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266 %! s = ifft2 (S); |
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267 %! |
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268 %! assert (s, answer, 30*eps ("single")); |
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269 */ |