Question

2. Let x[n] =cos((pi*n)/8) for -16 <= n <= 16 . On the same stem diagram, plot x(n) and x(n- 4). You should use the sigshift function to complete this exercise.

Answer 1

%matlab code

n=-16:16;
x=cos(pi*n/8);
x1=sigshift(x,4);
stem(x)
hold on
stem(x1,'-r')

function [y]=sigshift(x,m)
l=length(x);
y=x;
for i=1:l
if i<=m
y(i)=0;
else
y(i-m)=x(i);
end
end
end

о x(n) x(n-4 0.5 -0.5 10 15 20 25 30 35