The book "Numerical Recipes in Fortran77" by Press, Teukolsky, Vetterling and
Flannery describes a way to "pack" the even and odd coordinates of a real
vector "R" into a complex vector "C" of half the length. Then using various
FFT symmetries, they extract the FFT of "R" from the FFT of "C" which is half
the length of "R",
There is also an inverse process.
Is there an R function that does this?
Glenn Meyers
[EMAIL PROTECTED]
[EMAIL PROTECTED]
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