Mercurial > octave
annotate src/DLD-FUNCTIONS/fft2.cc @ 7814:87865ed7405f
Second set of single precision test code and fix of resulting bugs
author | David Bateman <dbateman@free.fr> |
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date | Mon, 02 Jun 2008 16:57:45 +0200 |
parents | 82be108cc558 |
children | 4976f66d469b |
rev | line source |
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2928 | 1 /* |
2 | |
7017 | 3 Copyright (C) 1997, 1999, 2002, 2004, 2005, 2006, 2007 David Bateman |
2928 | 4 Copyright (C) 1996, 1997 John W. Eaton |
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 | |
30 #include "defun-dld.h" | |
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 |
4773 | 38 #if defined (HAVE_FFTW3) |
39 #define FFTSRC "@sc{Fftw}" | |
40 #else | |
41 #define FFTSRC "@sc{Fftpack}" | |
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) | |
52 { | |
5823 | 53 print_usage (); |
2928 | 54 return retval; |
55 } | |
56 | |
57 octave_value arg = args(0); | |
4773 | 58 dim_vector dims = arg.dims (); |
5275 | 59 octave_idx_type n_rows = -1; |
4773 | 60 |
2928 | 61 if (nargin > 1) |
62 { | |
63 double dval = args(1).double_value (); | |
64 if (xisnan (dval)) | |
4773 | 65 error ("%s: NaN is invalid as the N_ROWS", fcn); |
2928 | 66 else |
4773 | 67 { |
5275 | 68 n_rows = NINTbig (dval); |
4773 | 69 if (n_rows < 0) |
70 error ("%s: number of rows must be greater than zero", fcn); | |
71 } | |
2928 | 72 } |
73 | |
74 if (error_state) | |
75 return retval; | |
76 | |
5275 | 77 octave_idx_type n_cols = -1; |
2928 | 78 if (nargin > 2) |
79 { | |
80 double dval = args(2).double_value (); | |
81 if (xisnan (dval)) | |
4773 | 82 error ("%s: NaN is invalid as the N_COLS", fcn); |
2928 | 83 else |
4773 | 84 { |
5275 | 85 n_cols = NINTbig (dval); |
4773 | 86 if (n_cols < 0) |
87 error ("%s: number of columns must be greater than zero", fcn); | |
88 } | |
2928 | 89 } |
90 | |
91 if (error_state) | |
92 return retval; | |
93 | |
4773 | 94 for (int i = 0; i < dims.length (); i++) |
95 if (dims(i) < 0) | |
2928 | 96 return retval; |
97 | |
4773 | 98 if (n_rows < 0) |
99 n_rows = dims (0); | |
100 else | |
101 dims (0) = n_rows; | |
2928 | 102 |
4773 | 103 if (n_cols < 0) |
104 n_cols = dims (1); | |
105 else | |
106 dims (1) = n_cols; | |
107 | |
108 if (dims.all_zero () || n_rows == 0 || n_cols == 0) | |
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109 if (arg.is_single_type ()) |
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110 return octave_value (FloatMatrix ()); |
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111 else |
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112 return octave_value (Matrix ()); |
2928 | 113 |
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114 if (arg.is_single_type ()) |
2928 | 115 { |
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116 if (arg.is_real_type ()) |
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117 { |
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118 FloatNDArray nda = arg.float_array_value (); |
2928 | 119 |
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120 if (! error_state) |
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121 { |
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122 nda.resize (dims, 0.0); |
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123 retval = (type != 0 ? nda.ifourier2d () : nda.fourier2d ()); |
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124 } |
2928 | 125 } |
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126 else |
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127 { |
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128 FloatComplexNDArray cnda = arg.float_complex_array_value (); |
2928 | 129 |
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130 if (! error_state) |
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131 { |
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132 cnda.resize (dims, 0.0); |
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133 retval = (type != 0 ? cnda.ifourier2d () : cnda.fourier2d ()); |
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134 } |
2928 | 135 } |
136 } | |
137 else | |
138 { | |
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139 if (arg.is_real_type ()) |
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140 { |
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141 NDArray nda = arg.array_value (); |
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142 |
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143 if (! error_state) |
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144 { |
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145 nda.resize (dims, 0.0); |
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146 retval = (type != 0 ? nda.ifourier2d () : nda.fourier2d ()); |
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147 } |
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148 } |
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149 else if (arg.is_complex_type ()) |
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150 { |
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151 ComplexNDArray cnda = arg.complex_array_value (); |
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152 |
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153 if (! error_state) |
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154 { |
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155 cnda.resize (dims, 0.0); |
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156 retval = (type != 0 ? cnda.ifourier2d () : cnda.fourier2d ()); |
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157 } |
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158 } |
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159 else |
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160 { |
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161 gripe_wrong_type_arg (fcn, arg); |
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162 } |
2928 | 163 } |
164 | |
165 return retval; | |
166 } | |
167 | |
4773 | 168 DEFUN_DLD (fft2, args, , |
169 "-*- texinfo -*-\n\ | |
170 @deftypefn {Loadable Function} {} fft2 (@var{a}, @var{n}, @var{m})\n\ | |
171 Compute the two dimensional FFT of @var{a} using subroutines from\n" | |
172 FFTSRC | |
173 ". The optional arguments @var{n} and @var{m} may be used specify the\n\ | |
174 number of rows and columns of @var{a} to use. If either of these is\n\ | |
175 larger than the size of @var{a}, @var{a} is resized and padded with\n\ | |
176 zeros.\n\ | |
177 \n\ | |
178 If @var{a} is a multi-dimensional matrix, each two-dimensional sub-matrix\n\ | |
7001 | 179 of @var{a} is treated separately\n\ |
6971 | 180 @seealso {ifft2, fft, fftn, fftw}\n\ |
5642 | 181 @end deftypefn") |
4773 | 182 { |
4782 | 183 return do_fft2 (args, "fft2", 0); |
4773 | 184 } |
185 | |
186 | |
187 DEFUN_DLD (ifft2, args, , | |
188 "-*- texinfo -*-\n\ | |
189 @deftypefn {Loadable Function} {} fft2 (@var{a}, @var{n}, @var{m})\n\ | |
190 Compute the inverse two dimensional FFT of @var{a} using subroutines from\n" | |
191 FFTSRC | |
192 ". The optional arguments @var{n} and @var{m} may be used specify the\n\ | |
193 number of rows and columns of @var{a} to use. If either of these is\n\ | |
194 larger than the size of @var{a}, @var{a} is resized and padded with\n\ | |
195 zeros.\n\ | |
196 \n\ | |
197 If @var{a} is a multi-dimensional matrix, each two-dimensional sub-matrix\n\ | |
7001 | 198 of @var{a} is treated separately\n\ |
6971 | 199 @seealso {fft2, ifft, ifftn, fftw}\n\ |
5642 | 200 @end deftypefn") |
4773 | 201 { |
4782 | 202 return do_fft2 (args, "ifft2", 1); |
4773 | 203 } |
204 | |
2928 | 205 /* |
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206 |
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207 %% Author: David Billinghurst (David.Billinghurst@riotinto.com.au) |
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208 %% Comalco Research and Technology |
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209 %% 02 May 2000 |
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210 %!test |
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211 %! M=16; |
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212 %! N=8; |
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213 %! |
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214 %! m=5; |
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215 %! n=3; |
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216 %! |
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217 %! x = 2*pi*(0:1:M-1)/M; |
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218 %! y = 2*pi*(0:1:N-1)/N; |
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219 %! sx = cos(m*x); |
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220 %! sy = sin(n*y); |
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221 %! s=kron(sx',sy); |
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222 %! S = fft2(s); |
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223 %! answer = kron(fft(sx)',fft(sy)); |
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224 %! assert(S, answer, 4*M*N*eps); |
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225 |
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226 %% Author: David Billinghurst (David.Billinghurst@riotinto.com.au) |
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227 %% Comalco Research and Technology |
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228 %% 02 May 2000 |
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229 %!test |
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230 %! M=12; |
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231 %! N=7; |
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232 %! |
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233 %! m=3; |
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234 %! n=2; |
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235 %! |
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236 %! x = 2*pi*(0:1:M-1)/M; |
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237 %! y = 2*pi*(0:1:N-1)/N; |
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238 %! |
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239 %! sx = cos(m*x); |
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240 %! sy = cos(n*y); |
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241 %! |
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242 %! S = kron(fft(sx)',fft(sy)); |
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243 %! answer=kron(sx',sy); |
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244 %! s = ifft2(S); |
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245 %! |
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246 %! assert(s, answer, 30*eps); |
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247 |
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248 |
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249 %% Author: David Billinghurst (David.Billinghurst@riotinto.com.au) |
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250 %% Comalco Research and Technology |
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251 %% 02 May 2000 |
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252 %!test |
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253 %! M=16; |
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254 %! N=8; |
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255 %! |
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256 %! m=5; |
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257 %! n=3; |
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258 %! |
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259 %! x = 2*pi*(0:1:M-1)/M; |
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260 %! y = 2*pi*(0:1:N-1)/N; |
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261 %! sx = single(cos(m*x)); |
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262 %! sy = single(sin(n*y)); |
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263 %! s=kron(sx',sy); |
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264 %! S = fft2(s); |
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265 %! answer = kron(fft(sx)',fft(sy)); |
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266 %! assert(S, answer, 4*M*N*eps('single')); |
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267 |
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268 %% Author: David Billinghurst (David.Billinghurst@riotinto.com.au) |
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269 %% Comalco Research and Technology |
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270 %% 02 May 2000 |
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271 %!test |
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272 %! M=12; |
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273 %! N=7; |
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274 %! |
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275 %! m=3; |
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276 %! n=2; |
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277 %! |
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278 %! x = single(2*pi*(0:1:M-1)/M); |
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279 %! y = single(2*pi*(0:1:N-1)/N); |
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280 %! |
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281 %! sx = cos(m*x); |
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282 %! sy = cos(n*y); |
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283 %! |
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284 %! S = kron(fft(sx)',fft(sy)); |
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285 %! answer=kron(sx',sy); |
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286 %! s = ifft2(S); |
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287 %! |
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288 %! assert(s, answer, 30*eps('single')); |
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289 |
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290 */ |
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291 |
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292 /* |
2928 | 293 ;;; Local Variables: *** |
294 ;;; mode: C++ *** | |
295 ;;; End: *** | |
296 */ |