expanding the existing matrix

I have a matrix like this.

M=[1 2 3;
   4 5 6].

I want to expanding it into

M'=[1 1 2 2 3 3;
    1 1 2 2 3 3;
    1 1 2 2 3 3;
    4 4 5 5 6 6;
    4 4 5 5 6 6;
    4 4 5 5 6 6].

I try to do this.but stil i could not get correct result?

Answer 1

[Andrei Bobrov]

kron(M,ones(3,2))

or

m = 3;
n= 2;
s = size(M);
out = reshape(permute(reshape(repmat(M,m,n),s(1),m,s(2),n),[2 1 4 3]),m*s(1),[]);

[mahesh chathuranga]

thak you very much

Answer 2

[Matt J]

Instead of expanding it (resulting in more memory consumption) consider using this instead

http://www.mathworks.com/matlabcentral/fileexchange/25969-efficient-object-oriented-kronecker-product-manipulation