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
ggmeyers@optonline.net

gmeyers@iso.com


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