i want to write matlab code that calculates fourier transform of following sequence and also plots its magnitude x(k)

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Aash
Aash le 6 Nov 2017
Commenté : Aash le 6 Nov 2017
x(n) = 3cos(4*pi*n/N) + sin(6*pi*n/N) where 0 <= n=< N-1 0 <= k =< N-1

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Birdman
Birdman le 6 Nov 2017
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
Birdman le 6 Nov 2017
Modifié(e) : Birdman le 6 Nov 2017
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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