Question

Please solve all. Thank you

Let Let x(n) = {2, 4, −3, 1, −5, 4, 7}. ↑ (arrow points to 1) Generate and plot the samples (use the stem function) of the following sequences. x(n) = 2 e 0.5 nx(n) + cos(0.1πn) x(n + 2), − 10 ≤ n ≤ 10

use these functions when solving please

1-

function [y,n] = sigshift(x,m,n0)
% implements y(n) = x(n-n0)
% -------------------------
% [y,n] = sigshift(x,m,n0)
%
n = m+n0; y = x;

2-

function [y,n] = sigmult(x1,n1,x2,n2)
% implements y(n) = x1(n)*x2(n)
% -----------------------------
% [y,n] = sigmult(x1,n1,x2,n2)
% y = product sequence over n, which includes n1 and n2
% x1 = first sequence over n1
% x2 = second sequence over n2 (n2 can be different from n1)
%
n = min(min(n1),min(n2)):max(max(n1),max(n2)); % duration of y(n)
y1 = zeros(1,length(n)); y2 = y1; %
y1(find((n>=min(n1))&(n<=max(n1))==1))=x1; % x1 with duration of y
y2(find((n>=min(n2))&(n<=max(n2))==1))=x2; % x2 with duration of y
y = y1 .* y2; % sequence multiplication

Answer 1

I did in a simple way.

result: