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| 19 | -rw-r--r--···0·root·········(0)·root·········(0)······867·2024-08-01·11:17:42.000000·./usr/share/doc/fftw-docs/copyright | 19 | -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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| 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·prime | 82 | <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 | -·2 | 88 | -·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·©·202 | 91 | Copyright·©·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_large | 57 | ····*·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_AIX | 59 | ····*·Q5.11._FFTW_2.1.3_crashes_on_AIX | 
| 60 | =============================================================================== | 60 | =============================================================================== | 
| 61 | ·····Matteo_Frigo_and_Steven_G._Johnson·/·fftw@fftw.org·-·2 | 61 | ·····Matteo_Frigo_and_Steven_G._Johnson·/·fftw@fftw.org·-·25·November·2026 | 
| 62 | Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,·Copyright·©·202 | 62 | Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,·Copyright·©·2026 | 
| 63 | Massachusetts·Institute·of·Technology. | 63 | Massachusetts·Institute·of·Technology. | 
| Offset 66, 12 lines modified | Offset 66, 12 lines modified | ||
| 66 | copyright·to·FFTW·and·they·only·let·us·GPL·it·because·we·convinced | 66 | copyright·to·FFTW·and·they·only·let·us·GPL·it·because·we·convinced | 
| 67 | them·that·it·would·neither·affect·their·licensing·revenue·nor·irritate | 67 | 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 | -·2 | 73 | -·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·©·202 | 76 | Copyright·©·2026·Massachusetts·Institute·of·Technology. | 
| 77 | </body></html> | 77 | </body></html> | 
| Offset 32, 11 lines modified | Offset 32, 11 lines modified | ||
| 32 | We·could·instead·have·released·FFTW·under·the·LGPL,·or·even·disallowed·non-Free | 32 | 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·they | 33 | 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·their | 34 | 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·-·2 | 39 | ·····Matteo_Frigo_and_Steven_G._Johnson·/·fftw@fftw.org·-·25·November·2026 | 
| 40 | Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,·Copyright·©·202 | 40 | Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,·Copyright·©·2026 | 
| 41 | Massachusetts·Institute·of·Technology. | 41 | Massachusetts·Institute·of·Technology. | 
| Offset 159, 12 lines modified | Offset 159, 12 lines modified | ||
| 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·recompile | 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·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 | -·2 | 166 | -·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·©·202 | 169 | Copyright·©·2026·Massachusetts·Institute·of·Technology. | 
| 170 | </body></html> | 170 | </body></html> | 
| Offset 87, 11 lines modified | Offset 87, 11 lines modified | ||
| 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·then | 88 | 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·-·2 | 94 | ·····Matteo_Frigo_and_Steven_G._Johnson·/·fftw@fftw.org·-·25·November·2026 | 
| 95 | Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,·Copyright·©·202 | 95 | Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,·Copyright·©·2026 | 
| 96 | Massachusetts·Institute·of·Technology. | 96 | Massachusetts·Institute·of·Technology. | 
| Offset 173, 12 lines modified | Offset 173, 12 lines modified | ||
| 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 | -·2 | 180 | -·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·©·202 | 183 | Copyright·©·2026·Massachusetts·Institute·of·Technology. | 
| 184 | </body></html> | 184 | </body></html> | 
| Offset 94, 11 lines modified | Offset 94, 11 lines modified | ||
| 94 | You·cannot·declare·large·arrays·statically;·you·should·use·malloc·(or | 94 | You·cannot·declare·large·arrays·statically;·you·should·use·malloc·(or | 
| 95 | equivalent)·to·allocate·the·arrays·you·want·to·transform·if·they·are·larger | 95 | 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·-·2 | 101 | ·····Matteo_Frigo_and_Steven_G._Johnson·/·fftw@fftw.org·-·25·November·2026 | 
| 102 | Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,·Copyright·©·202 | 102 | Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,·Copyright·©·2026 | 
| 103 | Massachusetts·Institute·of·Technology. | 103 | Massachusetts·Institute·of·Technology. | 
| Offset 75, 12 lines modified | Offset 75, 12 lines modified | ||
| 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 | -·2 | 82 | -·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·©·202 | 85 | Copyright·©·2026·Massachusetts·Institute·of·Technology. | 
| 86 | </body></html> | 86 | </body></html> | 
| Offset 40, 11 lines modified | Offset 40, 11 lines modified | ||
| 40 | can·be·reused. | 40 | can·be·reused. | 
| 41 | In·short,·wisdom·does·more·things·with·less·effort,·and·seemed·like·The·Right | 41 | 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·-·2 | 47 | ·····Matteo_Frigo_and_Steven_G._Johnson·/·fftw@fftw.org·-·25·November·2026 | 
| 48 | Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,·Copyright·©·202 | 48 | Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,·Copyright·©·2026 | 
| 49 | Massachusetts·Institute·of·Technology. | 49 | Massachusetts·Institute·of·Technology. | 
| Offset 126, 12 lines modified | Offset 126, 12 lines modified | ||
| 126 | The·FFTW·2.1.3·<code>configure</code>·script·picked·incorrect·compiler·flags·for·the·<code>xlc</code>·compiler·on·newer·IBM·processors.··This | 126 | 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 | -·2 | 132 | -·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·©·202 | 135 | Copyright·©·2026·Massachusetts·Institute·of·Technology. | 
| 136 | </body></html> | 136 | </body></html> | 
| Offset 62, 11 lines modified | Offset 62, 11 lines modified | ||
| 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·xlc | 64 | 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·-·2 | 69 | ·····Matteo_Frigo_and_Steven_G._Johnson·/·fftw@fftw.org·-·25·November·2026 | 
| 70 | Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,·Copyright·©·202 | 70 | Extracted·from·FFTW·Frequently·Asked·Questions·with·Answers,·Copyright·©·2026 | 
| 71 | Massachusetts·Institute·of·Technology. | 71 | Massachusetts·Institute·of·Technology. | 
| Offset 1, 9 lines modified | Offset 1, 9 lines modified | ||
| 1 | ············FFTW·FREQUENTLY·ASKED·QUESTIONS·WITH·ANSWERS | 1 | ············FFTW·FREQUENTLY·ASKED·QUESTIONS·WITH·ANSWERS | 
| 2 | ····························2 | 2 | ····························25·Nov·2026 | 
| 3 | » » » ·····Matteo·Frigo | 3 | » » » ·····Matteo·Frigo | 
| 4 | » » » ···Steven·G.·Johnson | 4 | » » » ···Steven·G.·Johnson | 
| 5 | ·» » » ····<fftw@fftw.org> | 5 | ·» » » ····<fftw@fftw.org> | 
| 6 | This·is·the·list·of·Frequently·Asked·Questions·about·FFTW,·a·collection·of | 6 | 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·or | 7 | fast·C·routines·for·computing·the·Discrete·Fourier·Transform·in·one·or | 
| 8 | more·dimensions. | 8 | more·dimensions. |