Re: Confused by FFTW output
From: Tom (flurboglarf_at_mailinator.com)
Date: 03/16/05
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Date: 15 Mar 2005 16:15:04 -0800
Hi,
thanks, Martin and James, I see now the flaw related to the symmetry
and implicit periodicity and now got a spectrum with a negligible
imaginary part. However, the real part is still different from the
analytic solution in that it changes sign some times; it is still only
the absolute value which reproduces the analytic solution (except for
the scaling factor, of course).
Here are the first 4 samples:
Re(F),num |F,num| Re(F),an
2.169456 2.169456 1.981664
-1.369174 1.369174 1.247095
0.3386716 0.3386716 0.3108198
-3.5211481E-02 3.5211481E-02 3.0680126E-02
It's probably trivial, but I don't get what is going on here. Any
further ideas?
Tom
- Previous message: spasmous: "Preconditioning and weighted least squares"
- In reply to: James Van Buskirk: "Re: Confused by FFTW output"
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