Matlab - graficar la señal

function h(n)

if nargin==0

    n =[ -4:0.5:4 ];

end

close all

f = n/2;

stem(n,f,'k','filled');

grid on

axis([n(1)-2 n(end)+2 min(f) max(f)])

>> n=[ -4:0.5:4 ]; h(n)

>> n=[ -4:0.5:4 ]; h(n+2)