How to create phase plot in Matlab?

Question

I need to calculate spectrum of the signal and plot its magnitude and phase in matlab. I have figured out how to do the magnitude plot, but cant understand how to do a phase plot

N = 1000; Ts = 0.05; Fs = 1/Ts;
t = [0:Ts:(N*Ts)-Ts];

xc = 4*exp(1i*5*pi*t) + 6*exp(1i*12*pi*t);
f=[-Fs/2:Fs/N:Fs/2-Fs/N];

Xc=fft(xc);

figure;

subplot(211)

plot(f,fftshift(abs(Xc))) ;title('Magnitude as a function of Hz');

xlabel('f in Hz');ylabel('|Xc|');grid on;

subplot(212)

w=2*pi*f;

plot(w,fftshift(abs(Xc))) ;title('Magnitude as a function of w');

xlabel('w');ylabel('|Xc|');grid on;

Any help would be appreciated

Dominic D · Accepted Answer · 2020-05-13 11:40:42Z

1

Replace abs you use for a magnitude plot with angle, like:

plot(w,fftshift(angle(Xc))) ;title('Phase as a function of w');

answered May 13, 2020 at 11:40

Dominic D

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