Mercurial > octave
annotate src/DLD-FUNCTIONS/fft2.cc @ 9890:483c4b09b788
ifft2 docstring fix
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 30 Nov 2009 13:32:38 -0500 |
parents | 0ce82753dd72 |
children | 40dfc0c99116 |
rev | line source |
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2928 | 1 /* |
2 | |
8920 | 3 Copyright (C) 1997, 1999, 2002, 2004, 2005, 2006, 2007, 2008, |
4 2009 David Bateman | |
2928 | 5 Copyright (C) 1996, 1997 John W. Eaton |
6 | |
7 This file is part of Octave. | |
8 | |
9 Octave is free software; you can redistribute it and/or modify it | |
10 under the terms of the GNU General Public License as published by the | |
7016 | 11 Free Software Foundation; either version 3 of the License, or (at your |
12 option) any later version. | |
2928 | 13 |
14 Octave is distributed in the hope that it will be useful, but WITHOUT | |
15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
17 for more details. | |
18 | |
19 You should have received a copy of the GNU General Public License | |
7016 | 20 along with Octave; see the file COPYING. If not, see |
21 <http://www.gnu.org/licenses/>. | |
2928 | 22 |
23 */ | |
24 | |
25 #ifdef HAVE_CONFIG_H | |
26 #include <config.h> | |
27 #endif | |
28 | |
29 #include "lo-mappers.h" | |
30 | |
31 #include "defun-dld.h" | |
32 #include "error.h" | |
33 #include "gripes.h" | |
34 #include "oct-obj.h" | |
35 #include "utils.h" | |
36 | |
4773 | 37 // This function should be merged with Fifft. |
2928 | 38 |
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39 #if defined (HAVE_FFTW) |
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40 #define FFTSRC "@sc{fftw}" |
4773 | 41 #else |
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42 #define FFTSRC "@sc{fftpack}" |
4773 | 43 #endif |
44 | |
45 static octave_value | |
46 do_fft2 (const octave_value_list &args, const char *fcn, int type) | |
2928 | 47 { |
4233 | 48 octave_value retval; |
2928 | 49 |
50 int nargin = args.length (); | |
51 | |
52 if (nargin < 1 || nargin > 3) | |
53 { | |
5823 | 54 print_usage (); |
2928 | 55 return retval; |
56 } | |
57 | |
58 octave_value arg = args(0); | |
4773 | 59 dim_vector dims = arg.dims (); |
5275 | 60 octave_idx_type n_rows = -1; |
4773 | 61 |
2928 | 62 if (nargin > 1) |
63 { | |
64 double dval = args(1).double_value (); | |
65 if (xisnan (dval)) | |
4773 | 66 error ("%s: NaN is invalid as the N_ROWS", fcn); |
2928 | 67 else |
4773 | 68 { |
5275 | 69 n_rows = NINTbig (dval); |
4773 | 70 if (n_rows < 0) |
71 error ("%s: number of rows must be greater than zero", fcn); | |
72 } | |
2928 | 73 } |
74 | |
75 if (error_state) | |
76 return retval; | |
77 | |
5275 | 78 octave_idx_type n_cols = -1; |
2928 | 79 if (nargin > 2) |
80 { | |
81 double dval = args(2).double_value (); | |
82 if (xisnan (dval)) | |
4773 | 83 error ("%s: NaN is invalid as the N_COLS", fcn); |
2928 | 84 else |
4773 | 85 { |
5275 | 86 n_cols = NINTbig (dval); |
4773 | 87 if (n_cols < 0) |
88 error ("%s: number of columns must be greater than zero", fcn); | |
89 } | |
2928 | 90 } |
91 | |
92 if (error_state) | |
93 return retval; | |
94 | |
4773 | 95 for (int i = 0; i < dims.length (); i++) |
96 if (dims(i) < 0) | |
2928 | 97 return retval; |
98 | |
4773 | 99 if (n_rows < 0) |
100 n_rows = dims (0); | |
101 else | |
102 dims (0) = n_rows; | |
2928 | 103 |
4773 | 104 if (n_cols < 0) |
105 n_cols = dims (1); | |
106 else | |
107 dims (1) = n_cols; | |
108 | |
109 if (dims.all_zero () || n_rows == 0 || n_cols == 0) | |
7924 | 110 { |
111 if (arg.is_single_type ()) | |
112 return octave_value (FloatMatrix ()); | |
113 else | |
114 return octave_value (Matrix ()); | |
115 } | |
2928 | 116 |
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117 if (arg.is_single_type ()) |
2928 | 118 { |
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119 if (arg.is_real_type ()) |
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120 { |
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121 FloatNDArray nda = arg.float_array_value (); |
2928 | 122 |
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123 if (! error_state) |
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124 { |
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125 nda.resize (dims, 0.0); |
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126 retval = (type != 0 ? nda.ifourier2d () : nda.fourier2d ()); |
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127 } |
2928 | 128 } |
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129 else |
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130 { |
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131 FloatComplexNDArray cnda = arg.float_complex_array_value (); |
2928 | 132 |
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133 if (! error_state) |
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134 { |
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135 cnda.resize (dims, 0.0); |
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136 retval = (type != 0 ? cnda.ifourier2d () : cnda.fourier2d ()); |
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137 } |
2928 | 138 } |
139 } | |
140 else | |
141 { | |
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142 if (arg.is_real_type ()) |
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143 { |
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144 NDArray nda = arg.array_value (); |
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145 |
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146 if (! error_state) |
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147 { |
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148 nda.resize (dims, 0.0); |
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149 retval = (type != 0 ? nda.ifourier2d () : nda.fourier2d ()); |
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150 } |
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151 } |
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152 else if (arg.is_complex_type ()) |
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153 { |
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154 ComplexNDArray cnda = arg.complex_array_value (); |
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155 |
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156 if (! error_state) |
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157 { |
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158 cnda.resize (dims, 0.0); |
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159 retval = (type != 0 ? cnda.ifourier2d () : cnda.fourier2d ()); |
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160 } |
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161 } |
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162 else |
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163 { |
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164 gripe_wrong_type_arg (fcn, arg); |
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165 } |
2928 | 166 } |
167 | |
168 return retval; | |
169 } | |
170 | |
4773 | 171 DEFUN_DLD (fft2, args, , |
172 "-*- texinfo -*-\n\ | |
173 @deftypefn {Loadable Function} {} fft2 (@var{a}, @var{n}, @var{m})\n\ | |
8496 | 174 Compute the two-dimensional FFT of @var{a} using subroutines from\n" |
4773 | 175 FFTSRC |
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176 ". The optional arguments @var{n} and @var{m} may be used specify the\n\ |
4773 | 177 number of rows and columns of @var{a} to use. If either of these is\n\ |
178 larger than the size of @var{a}, @var{a} is resized and padded with\n\ | |
179 zeros.\n\ | |
180 \n\ | |
181 If @var{a} is a multi-dimensional matrix, each two-dimensional sub-matrix\n\ | |
7001 | 182 of @var{a} is treated separately\n\ |
6971 | 183 @seealso {ifft2, fft, fftn, fftw}\n\ |
5642 | 184 @end deftypefn") |
4773 | 185 { |
4782 | 186 return do_fft2 (args, "fft2", 0); |
4773 | 187 } |
188 | |
189 | |
190 DEFUN_DLD (ifft2, args, , | |
191 "-*- texinfo -*-\n\ | |
9890 | 192 @deftypefn {Loadable Function} {} ifft2 (@var{a}, @var{n}, @var{m})\n\ |
8496 | 193 Compute the inverse two-dimensional FFT of @var{a} using subroutines from\n" |
4773 | 194 FFTSRC |
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195 ". The optional arguments @var{n} and @var{m} may be used specify the\n\ |
4773 | 196 number of rows and columns of @var{a} to use. If either of these is\n\ |
197 larger than the size of @var{a}, @var{a} is resized and padded with\n\ | |
198 zeros.\n\ | |
199 \n\ | |
200 If @var{a} is a multi-dimensional matrix, each two-dimensional sub-matrix\n\ | |
7001 | 201 of @var{a} is treated separately\n\ |
6971 | 202 @seealso {fft2, ifft, ifftn, fftw}\n\ |
5642 | 203 @end deftypefn") |
4773 | 204 { |
4782 | 205 return do_fft2 (args, "ifft2", 1); |
4773 | 206 } |
207 | |
2928 | 208 /* |
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209 |
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210 %% Author: David Billinghurst (David.Billinghurst@riotinto.com.au) |
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211 %% Comalco Research and Technology |
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212 %% 02 May 2000 |
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213 %!test |
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214 %! M=16; |
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215 %! N=8; |
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216 %! |
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217 %! m=5; |
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218 %! n=3; |
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219 %! |
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220 %! x = 2*pi*(0:1:M-1)/M; |
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221 %! y = 2*pi*(0:1:N-1)/N; |
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222 %! sx = cos(m*x); |
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223 %! sy = sin(n*y); |
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224 %! s=kron(sx',sy); |
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225 %! S = fft2(s); |
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226 %! answer = kron(fft(sx)',fft(sy)); |
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227 %! assert(S, answer, 4*M*N*eps); |
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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=12; |
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234 %! N=7; |
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235 %! |
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236 %! m=3; |
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237 %! n=2; |
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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 %! |
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242 %! sx = cos(m*x); |
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243 %! sy = cos(n*y); |
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244 %! |
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245 %! S = kron(fft(sx)',fft(sy)); |
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246 %! answer=kron(sx',sy); |
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247 %! s = ifft2(S); |
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248 %! |
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249 %! assert(s, answer, 30*eps); |
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250 |
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251 |
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252 %% Author: David Billinghurst (David.Billinghurst@riotinto.com.au) |
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253 %% Comalco Research and Technology |
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254 %% 02 May 2000 |
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255 %!test |
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256 %! M=16; |
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257 %! N=8; |
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258 %! |
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259 %! m=5; |
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260 %! n=3; |
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261 %! |
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262 %! x = 2*pi*(0:1:M-1)/M; |
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263 %! y = 2*pi*(0:1:N-1)/N; |
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264 %! sx = single(cos(m*x)); |
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265 %! sy = single(sin(n*y)); |
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266 %! s=kron(sx',sy); |
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267 %! S = fft2(s); |
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268 %! answer = kron(fft(sx)',fft(sy)); |
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269 %! assert(S, answer, 4*M*N*eps('single')); |
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270 |
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271 %% Author: David Billinghurst (David.Billinghurst@riotinto.com.au) |
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272 %% Comalco Research and Technology |
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273 %% 02 May 2000 |
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274 %!test |
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275 %! M=12; |
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276 %! N=7; |
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277 %! |
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278 %! m=3; |
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279 %! n=2; |
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280 %! |
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281 %! x = single(2*pi*(0:1:M-1)/M); |
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282 %! y = single(2*pi*(0:1:N-1)/N); |
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283 %! |
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284 %! sx = cos(m*x); |
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285 %! sy = cos(n*y); |
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286 %! |
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287 %! S = kron(fft(sx)',fft(sy)); |
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288 %! answer=kron(sx',sy); |
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289 %! s = ifft2(S); |
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290 %! |
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291 %! assert(s, answer, 30*eps('single')); |
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292 |
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293 */ |
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294 |
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295 /* |
2928 | 296 ;;; Local Variables: *** |
297 ;;; mode: C++ *** | |
298 ;;; End: *** | |
299 */ |