[R] fft question

[Frank Gerrit Zoellner]

Hi!

I am using the fft() function the base package to transform some 1d signal. 
If I use this standar fucntion I get a very huge first fourier coeficient.
I think this dues to the handling of the borders of the signal.
Usually in fft especially in image processing the signal is simulated to be continuous by adding the signal several times periodically. My question is, is there some function implemented in R handling this or do I have to combine my data manually ?

Thanks, 
-- 
Frank G. Zoellner
AG Angewandte Informatik
Technische Fakult"at
Universit"at Bielefeld
phone: +49(0)521-106-2951
fax:   +49(0)521-106-2992
email: fzoellne at techfak.uni-bielefeld.de