FFTW Frequently Asked Questions with Answers

This is the list of Frequently Asked Questions about FFTW, a collection of fast C routines for computing the Discrete Fourier Transform in one or more dimensions.

Index

Section 1. Introduction and General Information
Q1.1. What is FFTW ?
Q1.2. How do I obtain FFTW?
Q1.3. Is FFTW free software?
Section 2. Installation and use of FFTW
Q2.1. Which systems does FFTW run on?
Q2.2. Does FFTW run on DOS/Windows?
Q2.3. My compiler crashes when compiling FFTW.
Q2.4. Can I save FFTW's plans?
Q2.5. Which language is FFTW written in?
Q2.6. Can I call FFTW from FORTRAN?
Q2.7. Can I call FFTW from C++?
Q2.8. Why isn't FFTW written in FORTRAN/C++?
Section 3. Internals of FFTW
Q3.1. How does FFTW work?
Q3.2. Why is FFTW so fast?
Q3.3. What is this wisdom thing?
Q3.4. Why do you use wisdom? I just wanted to save a plan.
Q3.5. Why are there so many ways to import/export wisdom?
Section 4. Known bugs
Q4.1. FFTW-1.1 crashes in rfftwnd on Linux.

Matteo Frigo and Steven G. Johnson / fftw@theory.lcs.mit.edu - 08 September 1997