On Sat, Oct 25, 2008 at 10:40:33AM -0500, Jason Grout wrote: > > David Joyner wrote: > > (1) Sage also does FFT via the GSL. I guess they didn't try that, > > but I would imaginge they would be fast since they are in C. > > > The current CDF and RDF vectors implement fft using GSL. I'm in the > process of switching the RDF/CDF vector backend to numpy, and then the > fft will be done by numpy. I'm curious where the FFT is done by numpy > currently; I couldn't find the code. Of course, the reviewer used an > extremely old version of Sage (on our timescale), so maybe things were > different then. > > For matrices, switching to numpy made most things faster, so I'm curious > what we'll find when we switch the vectors to numpy as a backend. > Also Sage could use fftw unlike numpy (as it is gpl) which usually beats the pants of fftpack (which is what numpy uses) See: http://www.fftw.org/
According to the fftw benchmarks for speed: gsl < fftpack < fftw see: http://www.fftw.org/speed/CoreDuo-3.0GHz-icc/ Gabriel --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
