Using MATLAB to plot the input and the magnitude spectrum of the signal

1. How to plot magnitude spectrum of signal in MATLAB?
2. How do you plot the magnitude of a signal?
3. How do you plot magnitude of FFT in MATLAB?

How to plot magnitude spectrum of signal in MATLAB?

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Y_mags = abs(fft(y)); num_bins = length(Y_mags);

How do you plot the magnitude of a signal?

The Magnitude Spectrum of a signal describes a signal using frequency and amplitude. That is frequency components of a periodic signal are plotted using Frequency Domain - frequencies plotted in X-axis and amplitude plotted in Y-axis.

How do you plot magnitude of FFT in MATLAB?

y = fft(x); fs = 1/Ts; f = (0:length(y)-1)*fs/length(y); When you plot the magnitude of the signal as a function of frequency, the spikes in magnitude correspond to the signal's frequency components of 15 Hz and 20 Hz.