How to convert a vector to a row of a matrix and resize it at the same time in a special situation?

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Ayob
Ayob 2013-4-19
I want to convert a vector to a row of a matrix in a special situation which is necessary to resize it too as I explain.
for example:
vector A=[1 2 3]
should be the second row of matrix B in a special situation as shown below,as you see in the second row of the matrix B,after every two element zero we have a element of vector A.
B=[a b c d e f g h i;
0 0 1 0,0 2 0 0 3;
a1 b1 c1 d1 e1 f1 g1 h1 i1;
.. .. .. .. .. .. .. .. ..;]
My program is a large one and I need the way which is fast.

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采纳的回答

Matt J
Matt J 2013-4-19
B(2,:)=0;
B(2,3:3:end)=A;

更多回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-4-19
A=[1 2 3]
B=[5 5 5 5 5 5 5 5 5;0 0 0 0 0 0 0 0 0;4 4 4 4 4 4 4 4 4]
n=size(B,2)
id=fix(n/3);
B(2,id:id:n)=A

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