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| 2 | pj | 1 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> |
| 2 | <html> |
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| 3 | <head><title> |
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| 4 | FFTW Frequently Asked Questions with Answers |
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| 5 | </title> |
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| 6 | <link rev="made" href="mailto:fftw@theory.lcs.mit.edu"> |
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| 7 | <link rel="Contents" href="index.html"> |
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| 8 | <link rel="Start" href="index.html"> |
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| 9 | <META name="description" |
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| 10 | content="Frequently asked questions and answers (FAQ) for FFTW."> |
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| 11 | <link rel="Bookmark" title="FFTW FAQ" href="index.html"> |
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| 12 | <LINK rel="Bookmark" title="FFTW Home Page" |
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| 13 | href="http://theory.lcs.mit.edu/~fftw"> |
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| 14 | <LINK rel="Bookmark" title="FFTW Manual" |
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| 15 | href="http://theory.lcs.mit.edu/~fftw/doc/fftw_toc.html"> |
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| 16 | </head><body text="#000000" bgcolor="#FFFFFF"><h1> |
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| 17 | FFTW Frequently Asked Questions with Answers |
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| 18 | </h1> |
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| 19 | This is the list of Frequently Asked Questions about FFTW, a |
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| 20 | collection of fast C routines for computing the Discrete Fourier |
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| 21 | Transform in one or more dimensions. |
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| 22 | <h1> |
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| 23 | Index |
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| 24 | </h1> |
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| 25 | |||
| 26 | <ul> |
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| 27 | <li><b><font size="+2"><a href="section1.html" rel=subdocument>Section 1. Introduction and General Information</a></font></b> |
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| 28 | <li><a href="section1.html#whatisfftw" rel=subdocument>Q1.1. What is FFTW?</a> |
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| 29 | <li><a href="section1.html#whereisfftw" rel=subdocument>Q1.2. How do I obtain FFTW?</a> |
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| 30 | <li><a href="section1.html#isfftwfree" rel=subdocument>Q1.3. Is FFTW free software?</a> |
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| 31 | <li><a href="section1.html#nonfree" rel=subdocument>Q1.4. What is this about non-free licenses?</a> |
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| 32 | <br><br><li><b><font size="+2"><a href="section2.html" rel=subdocument>Section 2. Installing FFTW</a></font></b> |
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| 33 | <li><a href="section2.html#systems" rel=subdocument>Q2.1. Which systems does FFTW run on?</a> |
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| 34 | <li><a href="section2.html#runOnDOS" rel=subdocument>Q2.2. Does FFTW run on DOS/Windows?</a> |
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| 35 | <li><a href="section2.html#compilerCrashes" rel=subdocument>Q2.3. My compiler crashes when compiling FFTW.</a> |
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| 36 | <li><a href="section2.html#solarisSucks" rel=subdocument>Q2.4. FFTW does not compile on Solaris, complaining about |
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| 37 | <code>const</code>.</a> |
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| 38 | <li><a href="section2.html#languages" rel=subdocument>Q2.5. Which language is FFTW written in?</a> |
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| 39 | <li><a href="section2.html#fortran" rel=subdocument>Q2.6. Can I call FFTW from FORTRAN?</a> |
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| 40 | <li><a href="section2.html#cplusplus" rel=subdocument>Q2.7. Can I call FFTW from C++?</a> |
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| 41 | <li><a href="section2.html#whynotfortran" rel=subdocument>Q2.8. Why isn't FFTW written in FORTRAN/C++?</a> |
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| 42 | <li><a href="section2.html#singleprec" rel=subdocument>Q2.9. How do I compile FFTW to run in single precision?</a> |
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| 43 | <br><br><li><b><font size="+2"><a href="section3.html" rel=subdocument>Section 3. Using FFTW</a></font></b> |
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| 44 | <li><a href="section3.html#slow" rel=subdocument>Q3.1. FFTW seems really slow.</a> |
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| 45 | <li><a href="section3.html#conventions" rel=subdocument>Q3.2. FFTW gives results different from my old |
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| 46 | FFT.</a> |
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| 47 | <li><a href="section3.html#savePlans" rel=subdocument>Q3.3. Can I save FFTW's plans?</a> |
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| 48 | <li><a href="section3.html#whyscaled" rel=subdocument>Q3.4. Why does your inverse transform return a scaled |
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| 49 | result?</a> |
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| 50 | <li><a href="section3.html#centerorigin" rel=subdocument>Q3.5. How can I make FFTW put the origin (zero frequency) at the center of |
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| 51 | its output?</a> |
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| 52 | <li><a href="section3.html#imageaudio" rel=subdocument>Q3.6. How do I FFT an image/audio file in <i>foobar</i> format?</a> |
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| 53 | <li><a href="section3.html#linkfails" rel=subdocument>Q3.7. My program does not link (on Unix).</a> |
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| 54 | <br><br><li><b><font size="+2"><a href="section4.html" rel=subdocument>Section 4. Internals of FFTW</a></font></b> |
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| 55 | <li><a href="section4.html#howworks" rel=subdocument>Q4.1. How does FFTW work?</a> |
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| 56 | <li><a href="section4.html#whyfast" rel=subdocument>Q4.2. Why is FFTW so fast?</a> |
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| 57 | <li><a href="section4.html#wisdom" rel=subdocument>Q4.3. What is this <code>wisdom</code> thing?</a> |
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| 58 | <li><a href="section4.html#whywisdom" rel=subdocument>Q4.4. Why do you use <code>wisdom</code>? I just wanted to save a plan.</a> |
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| 59 | <br><br><li><b><font size="+2"><a href="section5.html" rel=subdocument>Section 5. Known bugs</a></font></b> |
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| 60 | <li><a href="section5.html#rfftwndbug" rel=subdocument>Q5.1. FFTW 1.1 crashes in rfftwnd on Linux.</a> |
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| 61 | <li><a href="section5.html#fftwmpibug" rel=subdocument>Q5.2. The MPI transforms in FFTW 1.2 give incorrect results/leak |
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| 62 | memory.</a> |
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| 63 | <li><a href="section5.html#testsingbug" rel=subdocument>Q5.3. The test programs in FFTW 1.2.1 fail when I change FFTW to use single |
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| 64 | precision.</a> |
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| 65 | <li><a href="section5.html#teststoobig" rel=subdocument>Q5.4. The test program in FFTW 1.2.1 fails for n > |
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| 66 | 46340.</a> |
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| 67 | <li><a href="section5.html#linuxthreads" rel=subdocument>Q5.5. The threaded code fails on Linux Redhat 5.0</a> |
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| 68 | <li><a href="section5.html#bigrfftwnd" rel=subdocument>Q5.6. FFTW 2.0's rfftwnd fails for rank > 1 transforms with a final |
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| 69 | dimension >= 65536.</a> |
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| 70 | <li><a href="section5.html#primebug" rel=subdocument>Q5.7. FFTW 2.0's complex transforms give the wrong results with prime |
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| 71 | factors 17 to 97.</a> |
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| 72 | <li><a href="section5.html#mpichbug" rel=subdocument>Q5.8. FFTW 2.1.1's MPI test programs crash with |
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| 73 | MPICH.</a> |
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| 74 | </ul><hr> |
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| 75 | <address> |
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| 76 | <A href="http://theory.lcs.mit.edu/~fftw/">Matteo Frigo and Steven G. Johnson</A> / <A href="mailto:fftw@theory.lcs.mit.edu">fftw@theory.lcs.mit.edu</A> |
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| 77 | - 18 May 1999 |
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| 78 | </address><br> |
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| 79 | Extracted from FFTW Frequently Asked Questions with Answers, |
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| 80 | Copyright © 1999 Massachusetts Institute of Technology. |
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| 81 | </body></html> |