MATLAB: How to compute fourier coefficient

coefficientfourier

Hi I have a pulse and I want to compute the first 20 fourier coefficient of it. Would anyone help me to do this?

Best Answer

f = fft(yourSignal);
f20 = f(1:20); % Extract first 20 coefficients.

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MATLAB: Fourier Series Coefficients

fft does not require a specific number of samples to work. Equivalently, it works because fft pads zeros to your sample.

If you don't want to use fft, use the definition of Fourier transform to get the coefficients. For example, a0 = mean(data), ak=mean(data*sin(2*pi/n*k)), etc.

MATLAB: How coding drag coefficient

See if this does what you want:

tau = @(U10) 1.22.*[1.2E-3.*((4 < U10) & (U10 < 11)) + 1E-3*(0.49 + 0.065*U10).*((11 <= U10) & (U10 < 25))].*U10.^2;
x = linspace(0, 24.9);
figure(1)
plot(x, tau(x))
xlabel('\itU_{10}\rm')
ylabel('\bf\tau\rm')
grid

Best Answer

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MATLAB: Fourier Series Coefficients

MATLAB: How coding drag coefficient

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