angle (Signal Processing Toolbox)

Phase angle

angle is a MATLAB function.

Signal-specific Example

Calculate the phase of the FFT of a sequence.

t = (0:99)/100;                   % Time vector
x = sin(2*pi*15*t) + sin(2*pi*40*t); % Signal
y = fft(x);                       % Compute DFT of x
p = unwrap(angle(y));             % Phase

Plot the phase:

f = (0:length(y)-1)'/length(y)*100; % Frequency vector
plot(f,p)

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