Re: [R] FFT, frequs, magnitudes, phases

2005-08-30 Thread Wolfgang Waser
Hi, here is some info about the first part of my homework, for those, who want to break down their signal (heart beat or whatever) into a collection of pure sin waves to analyse main frequency magnitudes and phases. First some very un-mathematical applied theory: If you sample a waveform

Re: [R] FFT, frequs, magnitudes, phases

2005-08-30 Thread Michael A. Miller
Wolfgang == Wolfgang Waser [EMAIL PROTECTED] writes: I would be most obliged for any comments and help. Wolfgang, I've used R's fft to filter ECG signals and will comment on your commentary based on my experience. First, as an easily accessible reference, I suggest The Scientist and

Re: [R] FFT, frequs, magnitudes, phases

2005-08-20 Thread Martin Maechler
PD == Peter Dalgaard [EMAIL PROTECTED] on 19 Aug 2005 14:16:42 +0200 writes: PD 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

[R] FFT, frequs, magnitudes, phases

2005-08-19 Thread 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

Re: [R] FFT, frequs, magnitudes, phases

2005-08-19 Thread Peter Dalgaard
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