i want to write matlab code that calculates fourier transform of following sequence and also plots its magnitude x(k)
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Birdman
2017-11-6
N=100;%%you can change it
n=0:N-1;
x=3*cos(4*pi*n/N)+sin(6*pi*n/N);
FFT=fft(x);
plot(abs(FFT))
Also please check
help fft
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Birdman
2017-11-6
编辑:Birdman
2017-11-6
You can not plot imaginary parts. The purpose of fft is to see the signals behaviour in frequency domain and by taking abs command, you make the signal appropriate for fft. The magnitude as you say in your question is relevant and we need to find the magnitude of the signal.
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