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differentiating FFT'd data
- From: Phil <phi39466 at yahoo dot com>
- To: gsl-discuss at sources dot redhat dot com
- Date: Wed, 18 Dec 2002 15:43:44 -0800 (PST)
- Subject: differentiating FFT'd data
I have pressure data from ocean waves and have
used the FFT to low-pass filter the data similiar
to the example at the end of ch. 15 of the manual
and have had very good results. Now I would like
to find local max and min values. Isn't there a
way to represent this "wave" as a series of sin
and cosine functions, it has been years since I
studied this. I could then differentiate this
directly rather than numerically. I would
appreciate any help.
Phil
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