How to enter intermittent entries in a vector

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Hi, I need a bit of your help please. Consider I have a vector A = [a1 a2 a3 a4], and another vector B=zeros(2*length(A)). I want to put the entries of A into B as follows:
B = [a1 a2 0 0 a3 a4 0 0]. Intermittent entries. I hope I am able to convey clearly the requirement. Awaiting the kind response.

Accepted Answer

Nora Khaled
Nora Khaled on 22 Nov 2020
for i=1:2:length(a)
v=[v a(i) a(i+1) 0 0] ;

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