On Tuesday 26 March 2002 15:57, Paglia, Frank M wrote: > If you have microsoft excel you can use it to do fft on your data = > signal. He said "free". Here are some suggestions: "octave" (http://www.octave.org or http://www.gnu.org/software/octave) does all kinds of neat mathematical processing, including FFT. Most circuit simulators have some kind of Fourier transform. Some, line "gnucap" (http://www.gnu.org/software/gnucap) give you source. Take the file "m_fft.cc" and wrap it however you want. The GNU Scientific Library (http://sources.redhat.com/gsl/ or http://www.gnu.org/software/gsl/) has linkable code for lots of numeric algorithms, including FFT. If you really want a spreadsheet, try "gnumeric" (http://www.gnu.org/software/gnumeric/gnumeric.html). Like most spreadsheets, it does Fourier analysis and lots of other stuff. You can write extensions in Python. If this isn't enough, look in http://ibiblio.org/pub/Linux/apps/ , particularly in the circuits and math directories off of there. ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu