solution:
function weaved=interweave(A,B)
lenA=length(A);
lenB=length(B);
diff=abs(lenA-lenB);
if lenA>lenB
len=2*lenA;
for j=(lenB+1):(lenB+diff)%adds zero to shorter vector
B(j)=0;
end
else
len=2*lenB;
for j=(lenA+1):(lenA+diff)%adds zero to shorter vector
A(j)=0;
end
end
cnt=1;
for i=1:2:(len-1)
weaved(i)=A(cnt);
weaved(i+1)=B(cnt);
cnt=cnt+1;