I’ve got a question about the fft in root.
After i managed to install fftw und including int in root i wrote the following:
TH1D *fft = new TH1D("test","test",nbin,xmin,xmax); hilfe->FFT(fft,"options");
hilfe is a TH1D with a sin-function in it.
I think i have to use “MAG R2C M” as options, to get the frequency-spectrum out of my values;
Can somebody tell me which values xmin,xmax,nbin i have to use, to get my original frquency, in other words how is the result of the fft scaled ?