Matlab

function[x,n]=impseq(n0,n1,n2)
n=[n1:n2];
x=[(n-n0)==0];
end

n=[-5:5];
x=2*impseq(-2,-5,5)-impseq(4,-5,5);
stem(n,x);



function[x,n]=imp(n0,n1,n2)
n=[n1:n2];
x=[(n-n0)>=0];
end

n=[-5:5];
x=2*imp(-2,-5,5)-imp(4,-5,5);
stem(n,x);



n=[0:50]
x=cos(.04*pi*n)+.2*randn(size(n))
stem(n,x);



n=[-10:9];
x=[5,4,3,2,1];
xtilde=x'*ones(1,4);
xtilde=(xtilde(:))';stem(n,xtilde);
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