How to plot signal with unit step?

I want to plot the following signal in matlab but I am not sure how to do this with the unit step response involved.

x[n] = ((4/5)^n)u[n]
    -5 < n < 20

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You can use heaviside function:

n = -5:1:20;
 x = ((4/5).^n).*heaviside(n);
 stem(n,x)

Bet be aware heaviside(0)=0.5

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How to plot signal with unit step?

How to plot signal with unit step?