>>>>> "Frank" == Frank Gerrit Zoellner <[EMAIL PROTECTED]>
>>>>> on Thu, 11 Mar 2004 16:04:27 +0100 writes:
Frank> Hi! I am using the fft() function the base package
Frank> to transform some 1d signal. If I use this standar
Frank> fucntion I get a very huge first fourier coeficient.
Frank> I think this dues to the handling of the borders of
Frank> the signal. Usually in fft especially in image
Frank> processing the signal is simulated to be continuous
Frank> by adding the signal several times periodically. My
Frank> question is, is there some function implemented in R
Frank> handling this or do I have to combine my data
Frank> manually ?
Yes, manually, like
fx <- fft(rep(x, 4))
when you want to quadruple your signal.
Martin
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