[R] fft help
FMGCFMGC
FMGCFMGC at terra.es
Tue Mar 11 20:19:41 CET 2003
Hello!
I suppose you want to obtain a fft of length, for example, 1024, from a
vector of size 100.
Fill the original vector with zeros to reach the desired length. This
is called 'zero padding'
fftn <- function(x, n) {
# fftn() - FFT of length n of a vector x
# Note: It does not check if n<length(x)
nx <- length(x)
xx <- c(x, rep(0, n-nx))
fft(xx)
}
See also ?nextn
Hope it helps!
Fran
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