how to plot periodic function

I have difficult with plotting a periodic function.

the function is : x(t)= exp(-abs(t)) ,-8<=t<=8 ,0 else

T=50 , (f(8)=f(58))

I succeed to plot the function exp(-abs(t)). But i don't know how to make the range -8<=t<=8 and else 0, and how to make the function periodic.

Thanks for help.

Answer 1

[Ameer Hamza]

Try something like this

t = -25:0.1:25;
index = t<8 & t>-8;
y = exp(-abs(t));

T = 50;

t_ = [t-2*T t-T t t+T t+2*T];
y_ = [y y y y y];

plot(t_, y_)