How to plot this function ?

U(t)={=-t,t=(0,pi/2); = 0, (pi/2,pi)}

Answer 1

[the cyclist]

Here is one way:

U = @(t) -(t<pi/2).*t + (t>=pi/2) * 0; % Don't really need that second term, since it is always zero

figure
tt = 0:0.01:pi;
plot(tt,U(tt),'.')

[Wasp Hamberg]

Thank you so much)))