Wolfgang Waser <[EMAIL PROTECTED]> writes: > Hi, > > I'm in dire need of a fast fourier transformation for me stupid biologist, > i.e. I have a heartbeat signal and would like to decompose it into pure sin > waves, getting three vectors, one containing the frequencies of the sin > waves, one the magnitudes and one the phases (that's what I get from my data > acquisition software's FFT function). > I'd be very much obliged, if someone could point out which command would do > the job in R.
fft(), but notice that it gives the complex transform. You need to do a little homework to get at the magnitude/phase values. (Basically, you just have to take Mod() and Arg(), but there some conventions about the frequencies and multipliers that one can get wrong). -- O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
