Snippet - Basic Matlab Filter

.m

%% Analyze signal

% Plots magnitude spectrum of the signal
X_mags=abs(fft(y));
figure(2)
plot(X_mags);
xlabel('DFT Bins');
ylabel('Magnitude');

% Plots first half of DFT (normalized frequency)
num_bins = length(X_mags);
plot([0:1/(num_bins/2 -1):1],X_mags(1:num_bins/2))
xlabel('Normalized frequency [\pi rads/samples]');
ylabel('Magnitude');