Hi @Mvana
Cannot open your jpg (I'm lazy to fix the link). If you study Pure Math in high school, you need to use the sign function to clip the signal. But in MATLAB, it's a pretty easy job do something like this. In Electrical Engineering, you can use the Diode Clipper circuit.
% original sine wave
t = linspace(0, 6*pi, 3600*3+1);
x = 7*sin(t);
plot(t, x, 'linewidth', 1.5), hold on
% clipped sine wave
ub = 4; % upper bound
lb = -4; % lower bound
y = max(lb, min(x, ub));
plot(t, y, 'linewidth', 1.5), hold off
grid on, xlabel('t'), ylabel('x(t)'), ylim([-10 10])
