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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> |