MATLAB: Insert 0 in the each 3N location

fill zeromatrix

I have matrix A that has something like this
 A = [ 1 2 .5 .6 -.7 .9, so on]
Now I want A to fill with zero at location 3, 6, 9 to 3N.
 A= [ 1 2 0 .5 .6 0, -7, .9 0 , etc.]

Best Answer

 B=zeros(1,3*N)
 for i=1:N
     B(1,3*i-2) = A(1,2*i-1);
     B(1,3*i-1) = A(1,2*i);
 end
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