discrete fourier
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Dear all, I need to find the fourier transform of a signal. My problem is that I don't have the analytic expression of it but a file with the datas (displayed in two columns one for the time the other for the signal). I have already extracted the datas with the importdata command and I now need to get the fourier transform graph (my sample time is constant). Any help would be highly appreciated. Thanks in advance. Ingrid
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Ingrid
2011-7-15
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Sean de Wolski
2011-7-15
The FFT is the discrete fourier transform - no analytical solution is required.
fft(rand(10,1))
Harsha Vardhan Rao Avunoori
2011-7-15
Hello Ingrid,
Did you try reading all the contents of your file into a cell variable and then perform fft on it ?
Something like this.
x = load('your file');
y = fft(x);
Not sure this will help you but try this.
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Ingrid
2011-7-15
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Walter Roberson
2011-7-15
To use fft() the times would have to be strictly increasing by a constant interval. MATLAB does not supply a routine for irregularly spaced discrete fft, but I seem to recall there are some File Exchange contributions for it. Unfortunately at the moment I do not recall the proper name for this calculation.
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