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10 -rw-r--r--···0·root·········(0)·root·········(0)·····8182·2024-08-01·11:21:10.000000·./usr/share/doc/fftw-docs/FAQ/section3.html10 -rw-r--r--···0·root·········(0)·root·········(0)·····8183·2024-08-01·11:21:10.000000·./usr/share/doc/fftw-docs/FAQ/section3.html
11 -rw-r--r--···0·root·········(0)·root·········(0)·····3766·2024-08-01·11:21:10.000000·./usr/share/doc/fftw-docs/FAQ/section4.html11 -rw-r--r--···0·root·········(0)·root·········(0)·····3767·2024-08-01·11:21:10.000000·./usr/share/doc/fftw-docs/FAQ/section4.html
12 -rw-r--r--···0·root·········(0)·root·········(0)·····5438·2024-08-01·11:21:10.000000·./usr/share/doc/fftw-docs/FAQ/section5.html12 -rw-r--r--···0·root·········(0)·root·········(0)·····5439·2024-08-01·11:21:10.000000·./usr/share/doc/fftw-docs/FAQ/section5.html
13 -rw-r--r--···0·root·········(0)·root·········(0)·····5193·2003-03-24·07:28:04.000000·./usr/share/doc/fftw-docs/NEWS.gz13 -rw-r--r--···0·root·········(0)·root·········(0)·····5193·2003-03-24·07:28:04.000000·./usr/share/doc/fftw-docs/NEWS.gz
14 -rw-r--r--···0·root·········(0)·root·········(0)·····2443·2003-03-16·23:43:18.000000·./usr/share/doc/fftw-docs/README14 -rw-r--r--···0·root·········(0)·root·········(0)·····2443·2003-03-16·23:43:18.000000·./usr/share/doc/fftw-docs/README
15 -rw-r--r--···0·root·········(0)·root·········(0)·····5147·2003-03-16·23:43:18.000000·./usr/share/doc/fftw-docs/README.hacks15 -rw-r--r--···0·root·········(0)·root·········(0)·····5147·2003-03-16·23:43:18.000000·./usr/share/doc/fftw-docs/README.hacks
16 -rw-r--r--···0·root·········(0)·root·········(0)·····3165·2003-03-16·23:43:18.000000·./usr/share/doc/fftw-docs/TODO16 -rw-r--r--···0·root·········(0)·root·········(0)·····3165·2003-03-16·23:43:18.000000·./usr/share/doc/fftw-docs/TODO
17 -rw-r--r--···0·root·········(0)·root·········(0)·····1084·2024-08-01·11:21:10.000000·./usr/share/doc/fftw-docs/changelog.Debian.gz17 -rw-r--r--···0·root·········(0)·root·········(0)·····1084·2024-08-01·11:21:10.000000·./usr/share/doc/fftw-docs/changelog.Debian.gz
18 -rw-r--r--···0·root·········(0)·root·········(0)····43492·2003-03-24·07:05:04.000000·./usr/share/doc/fftw-docs/changelog.gz18 -rw-r--r--···0·root·········(0)·root·········(0)····43492·2003-03-24·07:05:04.000000·./usr/share/doc/fftw-docs/changelog.gz
19 -rw-r--r--···0·root·········(0)·root·········(0)······867·2024-08-01·11:17:42.000000·./usr/share/doc/fftw-docs/copyright19 -rw-r--r--···0·root·········(0)·root·········(0)······867·2024-08-01·11:17:42.000000·./usr/share/doc/fftw-docs/copyright
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38 drwxr-xr-x···0·root·········(0)·root·········(0)········0·2024-08-01·11:21:10.000000·./usr/share/doc/fftw-docs/examples/threads/38 drwxr-xr-x···0·root·········(0)·root·········(0)········0·2024-08-01·11:21:10.000000·./usr/share/doc/fftw-docs/examples/threads/
39 -rw-r--r--···0·root·········(0)·root·········(0)······355·2024-08-01·11:17:42.000000·./usr/share/doc/fftw-docs/examples/threads/Makefile39 -rw-r--r--···0·root·········(0)·root·········(0)······355·2024-08-01·11:17:42.000000·./usr/share/doc/fftw-docs/examples/threads/Makefile
40 -rw-r--r--···0·root·········(0)·root·········(0)····10466·2003-03-16·23:43:19.000000·./usr/share/doc/fftw-docs/examples/threads/fftw_threads-int.h40 -rw-r--r--···0·root·········(0)·root·········(0)····10466·2003-03-16·23:43:19.000000·./usr/share/doc/fftw-docs/examples/threads/fftw_threads-int.h
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42 -rw-r--r--···0·root·········(0)·root·········(0)····25220·2003-03-16·23:43:19.000000·./usr/share/doc/fftw-docs/examples/threads/rfftw_threads_test.c42 -rw-r--r--···0·root·········(0)·root·········(0)····25220·2003-03-16·23:43:19.000000·./usr/share/doc/fftw-docs/examples/threads/rfftw_threads_test.c
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81 AIX.</a>81 AIX.</a>
82 <li><a·href="section5.html#bigprimebug"·rel=subdocument>Q5.10.·FFTW·2.1.2's·complex·transforms·give·incorrect·results·for·large·prime82 <li><a·href="section5.html#bigprimebug"·rel=subdocument>Q5.10.·FFTW·2.1.2's·complex·transforms·give·incorrect·results·for·large·prime
83 sizes.</a>83 sizes.</a>
84 <li><a·href="section5.html#aixflags"·rel=subdocument>Q5.11.·FFTW·2.1.3·crashes·on·AIX</a>84 <li><a·href="section5.html#aixflags"·rel=subdocument>Q5.11.·FFTW·2.1.3·crashes·on·AIX</a>
85 </ul><hr>85 </ul><hr>
86 <address>86 <address>
87 <A·href="http://www.fftw.org">Matteo·Frigo·and·Steven·G.·Johnson</A>·/·<A·href="mailto:fftw@fftw.org">fftw@fftw.org</A>87 <A·href="http://www.fftw.org">Matteo·Frigo·and·Steven·G.·Johnson</A>·/·<A·href="mailto:fftw@fftw.org">fftw@fftw.org</A>
88 -·23·October·202588 -·25·November·2026
89 </address><br>89 </address><br>
90 Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,90 Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,
91 Copyright·&copy;·2025·Massachusetts·Institute·of·Technology.91 Copyright·&copy;·2026·Massachusetts·Institute·of·Technology.
92 </body></html>92 </body></html>
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54 ······factors_17_to_97.54 ······factors_17_to_97.
55 ····*·Q5.8._FFTW_2.1.1's_MPI_test_programs_crash_with_MPICH.55 ····*·Q5.8._FFTW_2.1.1's_MPI_test_programs_crash_with_MPICH.
56 ····*·Q5.9._FFTW_2.1.2's_multi-threaded_transforms_don't_work_on_AIX.56 ····*·Q5.9._FFTW_2.1.2's_multi-threaded_transforms_don't_work_on_AIX.
57 ····*·Q5.10._FFTW_2.1.2's_complex_transforms_give_incorrect_results_for_large57 ····*·Q5.10._FFTW_2.1.2's_complex_transforms_give_incorrect_results_for_large
58 ······prime_sizes.58 ······prime_sizes.
59 ····*·Q5.11._FFTW_2.1.3_crashes_on_AIX59 ····*·Q5.11._FFTW_2.1.3_crashes_on_AIX
60 ===============================================================================60 ===============================================================================
61 ·····Matteo_Frigo_and_Steven_G._Johnson·/·fftw@fftw.org·-·23·October·202561 ·····Matteo_Frigo_and_Steven_G._Johnson·/·fftw@fftw.org·-·25·November·2026
  
62 Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,·Copyright·©·202562 Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,·Copyright·©·2026
63 Massachusetts·Institute·of·Technology.63 Massachusetts·Institute·of·Technology.
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66 copyright·to·FFTW·and·they·only·let·us·GPL·it·because·we·convinced66 copyright·to·FFTW·and·they·only·let·us·GPL·it·because·we·convinced
67 them·that·it·would·neither·affect·their·licensing·revenue·nor·irritate67 them·that·it·would·neither·affect·their·licensing·revenue·nor·irritate
68 existing·licensees.··<hr>68 existing·licensees.··<hr>
69 Next:·<a·href="section2.html"·rel=precedes>Installing·FFTW</a>.<br>69 Next:·<a·href="section2.html"·rel=precedes>Installing·FFTW</a>.<br>
70 <a·href="index.html"·rev=subdocument>Return·to·contents</a>.<p>70 <a·href="index.html"·rev=subdocument>Return·to·contents</a>.<p>
71 <address>71 <address>
72 <A·href="http://www.fftw.org">Matteo·Frigo·and·Steven·G.·Johnson</A>·/·<A·href="mailto:fftw@fftw.org">fftw@fftw.org</A>72 <A·href="http://www.fftw.org">Matteo·Frigo·and·Steven·G.·Johnson</A>·/·<A·href="mailto:fftw@fftw.org">fftw@fftw.org</A>
73 -·23·October·202573 -·25·November·2026
74 </address><br>74 </address><br>
75 Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,75 Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,
76 Copyright·&copy;·2025·Massachusetts·Institute·of·Technology.76 Copyright·&copy;·2026·Massachusetts·Institute·of·Technology.
77 </body></html>77 </body></html>
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32 We·could·instead·have·released·FFTW·under·the·LGPL,·or·even·disallowed·non-Free32 We·could·instead·have·released·FFTW·under·the·LGPL,·or·even·disallowed·non-Free
33 usage.·Suffice·it·to·say,·however,·that·MIT·owns·the·copyright·to·FFTW·and·they33 usage.·Suffice·it·to·say,·however,·that·MIT·owns·the·copyright·to·FFTW·and·they
34 only·let·us·GPL·it·because·we·convinced·them·that·it·would·neither·affect·their34 only·let·us·GPL·it·because·we·convinced·them·that·it·would·neither·affect·their
35 licensing·revenue·nor·irritate·existing·licensees.35 licensing·revenue·nor·irritate·existing·licensees.
36 ===============================================================================36 ===============================================================================
37 Next:·Installing_FFTW.37 Next:·Installing_FFTW.
38 Return_to_contents.38 Return_to_contents.
39 ·····Matteo_Frigo_and_Steven_G._Johnson·/·fftw@fftw.org·-·23·October·202539 ·····Matteo_Frigo_and_Steven_G._Johnson·/·fftw@fftw.org·-·25·November·2026
  
40 Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,·Copyright·©·202540 Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,·Copyright·©·2026
41 Massachusetts·Institute·of·Technology.41 Massachusetts·Institute·of·Technology.
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159 On·a·Unix·system:·<code>configure·--enable-float</code>.··On·a·non-Unix·system:·edit·<code>fftw/fftw.h</code>·to·<code>#define</code>·the·symbol·<code>FFTW_ENABLE_FLOAT</code>.··In·both·cases,·you·must·then·recompile159 On·a·Unix·system:·<code>configure·--enable-float</code>.··On·a·non-Unix·system:·edit·<code>fftw/fftw.h</code>·to·<code>#define</code>·the·symbol·<code>FFTW_ENABLE_FLOAT</code>.··In·both·cases,·you·must·then·recompile
160 FFTW.··<hr>160 FFTW.··<hr>
161 Next:·<a·href="section3.html"·rel=precedes>Using·FFTW</a>.<br>161 Next:·<a·href="section3.html"·rel=precedes>Using·FFTW</a>.<br>
162 Back:·<a·href="section1.html"·rev=precedes>Introduction·and·General·Information</a>.<br>162 Back:·<a·href="section1.html"·rev=precedes>Introduction·and·General·Information</a>.<br>
163 <a·href="index.html"·rev=subdocument>Return·to·contents</a>.<p>163 <a·href="index.html"·rev=subdocument>Return·to·contents</a>.<p>
164 <address>164 <address>
165 <A·href="http://www.fftw.org">Matteo·Frigo·and·Steven·G.·Johnson</A>·/·<A·href="mailto:fftw@fftw.org">fftw@fftw.org</A>165 <A·href="http://www.fftw.org">Matteo·Frigo·and·Steven·G.·Johnson</A>·/·<A·href="mailto:fftw@fftw.org">fftw@fftw.org</A>
166 -·23·October·2025166 -·25·November·2026
167 </address><br>167 </address><br>
168 Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,168 Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,
169 Copyright·&copy;·2025·Massachusetts·Institute·of·Technology.169 Copyright·&copy;·2026·Massachusetts·Institute·of·Technology.
170 </body></html>170 </body></html>
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87 On·a·Unix·system:·configure·--enable-float.·On·a·non-Unix·system:·edit·fftw/87 On·a·Unix·system:·configure·--enable-float.·On·a·non-Unix·system:·edit·fftw/
88 fftw.h·to·#define·the·symbol·FFTW_ENABLE_FLOAT.·In·both·cases,·you·must·then88 fftw.h·to·#define·the·symbol·FFTW_ENABLE_FLOAT.·In·both·cases,·you·must·then
89 recompile·FFTW.89 recompile·FFTW.
90 ===============================================================================90 ===============================================================================
91 Next:·Using_FFTW.91 Next:·Using_FFTW.
92 Back:·Introduction_and_General_Information.92 Back:·Introduction_and_General_Information.
93 Return_to_contents.93 Return_to_contents.
94 ·····Matteo_Frigo_and_Steven_G._Johnson·/·fftw@fftw.org·-·23·October·202594 ·····Matteo_Frigo_and_Steven_G._Johnson·/·fftw@fftw.org·-·25·November·2026
  
95 Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,·Copyright·©·202595 Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,·Copyright·©·2026
96 Massachusetts·Institute·of·Technology.96 Massachusetts·Institute·of·Technology.
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173 transform·if·they·are·larger·than·a·few·hundred·elements.·173 transform·if·they·are·larger·than·a·few·hundred·elements.·
174 <hr>174 <hr>
175 Next:·<a·href="section4.html"·rel=precedes>Internals·of·FFTW</a>.<br>175 Next:·<a·href="section4.html"·rel=precedes>Internals·of·FFTW</a>.<br>
176 Back:·<a·href="section2.html"·rev=precedes>Installing·FFTW</a>.<br>176 Back:·<a·href="section2.html"·rev=precedes>Installing·FFTW</a>.<br>
177 <a·href="index.html"·rev=subdocument>Return·to·contents</a>.<p>177 <a·href="index.html"·rev=subdocument>Return·to·contents</a>.<p>
178 <address>178 <address>
179 <A·href="http://www.fftw.org">Matteo·Frigo·and·Steven·G.·Johnson</A>·/·<A·href="mailto:fftw@fftw.org">fftw@fftw.org</A>179 <A·href="http://www.fftw.org">Matteo·Frigo·and·Steven·G.·Johnson</A>·/·<A·href="mailto:fftw@fftw.org">fftw@fftw.org</A>
180 -·23·October·2025180 -·25·November·2026
181 </address><br>181 </address><br>
182 Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,182 Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,
183 Copyright·&copy;·2025·Massachusetts·Institute·of·Technology.183 Copyright·&copy;·2026·Massachusetts·Institute·of·Technology.
184 </body></html>184 </body></html>
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94 You·cannot·declare·large·arrays·statically;·you·should·use·malloc·(or94 You·cannot·declare·large·arrays·statically;·you·should·use·malloc·(or
95 equivalent)·to·allocate·the·arrays·you·want·to·transform·if·they·are·larger95 equivalent)·to·allocate·the·arrays·you·want·to·transform·if·they·are·larger
96 than·a·few·hundred·elements.96 than·a·few·hundred·elements.
97 ===============================================================================97 ===============================================================================
98 Next:·Internals_of_FFTW.98 Next:·Internals_of_FFTW.
99 Back:·Installing_FFTW.99 Back:·Installing_FFTW.
100 Return_to_contents.100 Return_to_contents.
101 ·····Matteo_Frigo_and_Steven_G._Johnson·/·fftw@fftw.org·-·23·October·2025101 ·····Matteo_Frigo_and_Steven_G._Johnson·/·fftw@fftw.org·-·25·November·2026
  
102 Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,·Copyright·©·2025102 Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,·Copyright·©·2026
103 Massachusetts·Institute·of·Technology.103 Massachusetts·Institute·of·Technology.
1.41 KB
./usr/share/doc/fftw-docs/FAQ/section4.html
    
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75 <p>75 <p>
76 In·short,·<code>wisdom</code>·does·more·things·with·less·effort,·and·seemed·like·The·Right·Thing·to·do.··<hr>76 In·short,·<code>wisdom</code>·does·more·things·with·less·effort,·and·seemed·like·The·Right·Thing·to·do.··<hr>
77 Next:·<a·href="section5.html"·rel=precedes>Known·bugs</a>.<br>77 Next:·<a·href="section5.html"·rel=precedes>Known·bugs</a>.<br>
78 Back:·<a·href="section3.html"·rev=precedes>Using·FFTW</a>.<br>78 Back:·<a·href="section3.html"·rev=precedes>Using·FFTW</a>.<br>
79 <a·href="index.html"·rev=subdocument>Return·to·contents</a>.<p>79 <a·href="index.html"·rev=subdocument>Return·to·contents</a>.<p>
80 <address>80 <address>
81 <A·href="http://www.fftw.org">Matteo·Frigo·and·Steven·G.·Johnson</A>·/·<A·href="mailto:fftw@fftw.org">fftw@fftw.org</A>81 <A·href="http://www.fftw.org">Matteo·Frigo·and·Steven·G.·Johnson</A>·/·<A·href="mailto:fftw@fftw.org">fftw@fftw.org</A>
82 -·23·October·202582 -·25·November·2026
83 </address><br>83 </address><br>
84 Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,84 Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,
85 Copyright·&copy;·2025·Massachusetts·Institute·of·Technology.85 Copyright·&copy;·2026·Massachusetts·Institute·of·Technology.
86 </body></html>86 </body></html>
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40 can·be·reused.40 can·be·reused.
41 In·short,·wisdom·does·more·things·with·less·effort,·and·seemed·like·The·Right41 In·short,·wisdom·does·more·things·with·less·effort,·and·seemed·like·The·Right
42 Thing·to·do.42 Thing·to·do.
43 ===============================================================================43 ===============================================================================
44 Next:·Known_bugs.44 Next:·Known_bugs.
45 Back:·Using_FFTW.45 Back:·Using_FFTW.
46 Return_to_contents.46 Return_to_contents.
47 ·····Matteo_Frigo_and_Steven_G._Johnson·/·fftw@fftw.org·-·23·October·202547 ·····Matteo_Frigo_and_Steven_G._Johnson·/·fftw@fftw.org·-·25·November·2026
  
48 Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,·Copyright·©·202548 Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,·Copyright·©·2026
49 Massachusetts·Institute·of·Technology.49 Massachusetts·Institute·of·Technology.
1.54 KB
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126 The·FFTW·2.1.3·<code>configure</code>·script·picked·incorrect·compiler·flags·for·the·<code>xlc</code>·compiler·on·newer·IBM·processors.··This126 The·FFTW·2.1.3·<code>configure</code>·script·picked·incorrect·compiler·flags·for·the·<code>xlc</code>·compiler·on·newer·IBM·processors.··This
127 is·fixed·in·FFTW·2.1.4.··<hr>127 is·fixed·in·FFTW·2.1.4.··<hr>
128 Back:·<a·href="section4.html"·rev=precedes>Internals·of·FFTW</a>.<br>128 Back:·<a·href="section4.html"·rev=precedes>Internals·of·FFTW</a>.<br>
129 <a·href="index.html"·rev=subdocument>Return·to·contents</a>.<p>129 <a·href="index.html"·rev=subdocument>Return·to·contents</a>.<p>
130 <address>130 <address>
131 <A·href="http://www.fftw.org">Matteo·Frigo·and·Steven·G.·Johnson</A>·/·<A·href="mailto:fftw@fftw.org">fftw@fftw.org</A>131 <A·href="http://www.fftw.org">Matteo·Frigo·and·Steven·G.·Johnson</A>·/·<A·href="mailto:fftw@fftw.org">fftw@fftw.org</A>
132 -·23·October·2025132 -·25·November·2026
133 </address><br>133 </address><br>
134 Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,134 Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,
135 Copyright·&copy;·2025·Massachusetts·Institute·of·Technology.135 Copyright·&copy;·2026·Massachusetts·Institute·of·Technology.
136 </body></html>136 </body></html>
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62 (Sizes·without·large·prime·factors·are·not·affected.)62 (Sizes·without·large·prime·factors·are·not·affected.)
63 *****·Question·5.11.·FFTW·2.1.3·crashes·on·AIX·*****63 *****·Question·5.11.·FFTW·2.1.3·crashes·on·AIX·*****
64 The·FFTW·2.1.3·configure·script·picked·incorrect·compiler·flags·for·the·xlc64 The·FFTW·2.1.3·configure·script·picked·incorrect·compiler·flags·for·the·xlc
65 compiler·on·newer·IBM·processors.·This·is·fixed·in·FFTW·2.1.4.65 compiler·on·newer·IBM·processors.·This·is·fixed·in·FFTW·2.1.4.
66 ===============================================================================66 ===============================================================================
67 Back:·Internals_of_FFTW.67 Back:·Internals_of_FFTW.
68 Return_to_contents.68 Return_to_contents.
69 ·····Matteo_Frigo_and_Steven_G._Johnson·/·fftw@fftw.org·-·23·October·202569 ·····Matteo_Frigo_and_Steven_G._Johnson·/·fftw@fftw.org·-·25·November·2026
  
70 Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,·Copyright·©·202570 Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,·Copyright·©·2026
71 Massachusetts·Institute·of·Technology.71 Massachusetts·Institute·of·Technology.
510 B
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424 B
fftw-faq.ascii
    
Offset 1, 9 lines modifiedOffset 1, 9 lines modified
1 ············FFTW·FREQUENTLY·ASKED·QUESTIONS·WITH·ANSWERS1 ············FFTW·FREQUENTLY·ASKED·QUESTIONS·WITH·ANSWERS
2 ····························23·Oct·20252 ····························25·Nov·2026
3 »       »       »       ·····Matteo·Frigo3 »       »       »       ·····Matteo·Frigo
4 »       »       »       ···Steven·G.·Johnson4 »       »       »       ···Steven·G.·Johnson
5 ·»       »       »       ····<fftw@fftw.org>5 ·»       »       »       ····<fftw@fftw.org>
  
6 This·is·the·list·of·Frequently·Asked·Questions·about·FFTW,·a·collection·of6 This·is·the·list·of·Frequently·Asked·Questions·about·FFTW,·a·collection·of
7 fast·C·routines·for·computing·the·Discrete·Fourier·Transform·in·one·or7 fast·C·routines·for·computing·the·Discrete·Fourier·Transform·in·one·or
8 more·dimensions.8 more·dimensions.