[R] a question about fft ( fast fourier transform)

From: <lma5_at_ncsu.edu>
Date: Wed 27 Jul 2005 - 05:18:06 EST

Dear listers

 In R, if I have a sequence x(t), t=1,...N, fft(x) is actually giving us sum(x(t)exp(-i*omega*t)) at fourier frequency omega= 2*pi*i/N, i=0,1,...(N-1).

The question is if I want to calculate sum(x(t)exp(-i*2*omega*t)), how can I do it?
thanks a lot!

liyun (Lauren) Ma
Dept of Statistics
North Carolina State University

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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Wed Jul 27 05:21:23 2005

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