Snippet - Basic Matlab Code

.m

% Filters the signal using coefficients obtained by the butter filter
% design
x_filtered = filter(b,a,y);

% Plots the filtered signal
figure(4)
plot(t,x_filtered,'r')
hold on 
plot(t,y0,'k','LineWidth',2)
hold on 
plot(t,15,'k','LineWidth',2)
grid on
title('Filtered Signal - Second Order Butterworth');
xlabel('Samples');
ylabel('Amplitude');