plotting discrete time signals

I'm trying to plot a discrete time signal with a step function from -5 to 5 I am trying to use the heaviside() function but keep getting errors. Can anyone tell me why this is invalid matlab syntax?

n = [-5 -4 -3 -2 -1 0 1 2 3 4 5];
f_one = 2*(0.5)^.n * heaviside(n.+2)

Answer 1

[Azzi Abdelmalek]

% You have so

n = [-5 -4 -3 -2 -1 0 1 2 3 4 5];
f_one = 2*0.5.^n.* heaviside(n+2)
stem(n,f_one)

% The operator .+ does not exist in Matlab

Answer 2

[William]

Thanks again for your help! It's been three in a row :) You're awesome!

Answer 3

[aswathy subash]

matlab program for to sketch magnitude and phase spectrum of discrete time system H(e^jw)=(1-e^(-3jw))/3(1-e(-jw) )