Fourier transform how to get coefficients
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Vincent Sin
on 15 Dec 2018
Commented: Star Strider
on 15 Dec 2018
Hey everyone, i know that matlab have the method for fourier transform implemented but i was wondering if there is anything that could give me coefficients of fourier transfrom.
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Star Strider
on 15 Dec 2018
With the MATLAB fft function, at each frequency, the real value is the cosine coefficient, and the imaginary value is the sine coefficient.
At least that is how I understand it.
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Star Strider
on 15 Dec 2018
You can use any subset you like. This is just an example.
Another option might be to take an arbitrary subset of the transformed matrix:
idx = randperm(numel(P), fix(numel(P)/3));
sbs = ind2sub(size(Y), idx);
S = false(size(Y));
S(sbs) = 1;
Ys = Y.*S;
P2 = ifft(Ys);
figure
imagesc(abs(P2))
Try this on the original and the ‘Y’ array after using fftshift.
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