[R] FFT, frequs, magnitudes, phases

[Wolfgang Waser]

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.

Thanks!

Wolfgang