From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham autolearn_force=no version=3.4.4 X-Google-Thread: 103376,101749b7bab4e562 X-Google-Attributes: gid103376,public X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news1.google.com!news1.google.com!newsread.com!news-xfer.newsread.com!news-feed01.roc.ny.frontiernet.net!nntp.frontiernet.net!newscon06.news.prodigy.com!prodigy.net!border1.nntp.dca.giganews.com!nntp.giganews.com!local01.nntp.dca.giganews.com!nntp.comcast.com!news.comcast.com.POSTED!not-for-mail NNTP-Posting-Date: Wed, 13 Apr 2005 13:16:52 -0500 From: tmoran@acm.org Newsgroups: comp.lang.ada Subject: Re: FFT References: X-Newsreader: Tom's custom newsreader Message-ID: Date: Wed, 13 Apr 2005 13:16:52 -0500 NNTP-Posting-Host: 67.161.24.234 X-Trace: sv3-xPsuzbZnPBGc2+h1GirzGSy5J2KGQ+3fIfZZTdwyYDvfNNAsFgYKYavZQFy5svJKQTV1GeE+TSriWU3!3A7dNVERMaDQsmZRzWMxfdbxkjxtkEKcVh3XKtRMus+mas4jMRBN/PEWI7AaPA== X-Complaints-To: abuse@comcast.net X-DMCA-Complaints-To: dmca@comcast.net X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.31 Xref: g2news1.google.com comp.lang.ada:10434 Date: 2005-04-13T13:16:52-05:00 List-Id: In addition to FFTW, there's also http://cr.yp.to/djbfft.html which doesn't appear to have any restrictions. It appears to be for very fast computation of powers of two FFTs. It's in very nasty C, though. I have here a package fft_pack with Glassman's algorithm for arbitrary N, but I can't seem to track its provenance. If speed isn't an issue, it's quite convenient. Numerical Recipes in Fortran (etc) has source and discussion of various FFT situations.