Fill values from different matrices size

Hello,

I want to know how I can put the values of a matrix 3x3 into a matrix of 6x6 (for example), adding zeros in the not pair rows and colums, just like that:

A B C

D E F

G H I

into:

A 0 B 0 C 0

0 0 0 0 0 0

D 0 E 0 F 0

0 0 0 0 0 0

G 0 H 0 I 0

0 0 0 0 0 0

Thank you very much!

Answer 1

[Grzegorz Knor]

For example:

a = rand(3);
b = zeros(6);
b(1:2:end,1:2:end) = a