On Thu, Sep 18, 2008 at 10:19 AM, Sand Wraith <[EMAIL PROTECTED]> wrote: > > Hi all! > > Does anyone know where to find guide or example how to use Fourier > transform and inverse Fourier transform in sage? >
Here's an example: sage: v = vector(CDF,[1..10]); v (1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0) sage: w = v.fft(); w (55.0, -5.0 + 15.3884176859*I, -5.0 + 6.88190960236*I, -5.0 + 3.63271264003*I, -5.0 + 1.62459848116*I, -5.0, -5.0 - 1.62459848116*I, -5.0 - 3.63271264003*I, -5.0 - 6.88190960236*I, -5.0 - 15.3884176859*I) sage: w.inv_fft() (1.0 - 8.881784197e-17*I, 2.0 - 3.7437131288e-16*I, 3.0 + 4.15667297272e-18*I, 4.0 + 4.46859877911e-16*I, 5.0 + 4.33797144802e-16*I, 6.0 - 8.881784197e-17*I, 7.0 + 4.61256576967e-17*I, 8.0 + 2.04083553579e-16*I, 9.0 - 3.67679530233e-16*I, 10.0 - 2.15336379908e-16*I) > Thanks. > > > -- William Stein Associate Professor of Mathematics University of Washington http://wstein.org --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@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-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
