MATLAB: Add a number every n values

array

Hi all,
I have a question:
If I have an array 
A=[ 1 2 3 4 5   3 0 2 8 3   2 1 0 3 2  0 0 1 1 0  3 1 5  3 2  8 1 0 3 2];
Is it possible to put the a value "a=800" after every 6 elements of A; (or after every 3 elements etc.)
So I get 
b=[ 1 2 3 4 5  a  3 0 2 8 3  a   2 1 0 3 2  a 0 0 1 1 0   a 3 1 5  3 2 a  8 1 0 3 2 a];
thanks a lot!!
Nikolas

Best Answer

A=[ 1 2 3 4 5 3 0 2 8 3 2 1 0 3 2 0 0 1 1 0 3 1 5 3 2 8 1 0 3 2];
a=4;
after=6;
b=nan(1,numel(A)+after);
b(after:after:end)=a;
b(isnan(b))=A
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