How to plot varying cos function

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Assiya Syzdykova
Assiya Syzdykova 2020-10-17
评论： Ameer Hamza 2020-10-18
I have to draw a function like below
I need a cos function when its is between pi and 2*pi, and 0 function when it is between 0 and pi. Also I am trying to plot it for several periods:
syms t
T=1/(n/60)
if pi<=5*pi*t<=2*pi
Qt = 0.001*cos(5*pi*t)
if 0<5*pi*t<pi
Qt=0
end
plot(t,Qt,[0, 5*T])
Could someone help me to fix this code, please

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Ameer Hamza
Ameer Hamza 2020-10-17
编辑：Ameer Hamza 2020-10-17
Try something like this
t = linspace(0, 4*pi, 200);
y = cos(t);
y(y<0) = 0;
plot(t, y)
xlim([0 4*pi]);
ylim([-1.5 1.5]);

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