Plotting functions in matlab

I am having trouble figuring out how to plot functions in matlab. Below are examples of functions I am having trouble with. I don't know what functions to use or even how to write it to where it could be plotted.

f(t) = Kt[u(t+a/2)-u(t-a/2)]

f(t) = Acos(pi*t/2)[u(t+2)-u(t-2)]

f(t) = Ae^(-2(t-1))u(t-1)

I am new to matlab, so anything would be helpful. Thanks.

Answer 1

[Youssef Khmou]

hi, try as example :

 % Constants 
 K=2.33;
 A=1.45;
 t=0:0.1:10;
 a=0.45;

 % Anonymous function
 u=@(t) cos(t)

 f1=K*t.*(u(t+a/2)-u(t-a/2));
 f2=A*cos(pi*t/2).*(u(t+2)-u(t-2));
 f3=A*exp(-2*(t-1)).*u(t-1);

 figure, plot(t,f1,t,f2,'r',t,f3,'g'), legend('f1','f2','f3');
 grid on,