MATLAB: How to resize or scale up a matrix without for loop

resize matrix scale up matrix

Hello,
I have matrix A:
 A = 
 1    2
 3    4
and want to resize it to be matrix B. Matrix B should be like this:
 B = 
 1 1 1 2 2 2
 1 1 1 2 2 2
 1 1 1 2 2 2
 3 3 3 4 4 4
 3 3 3 4 4 4
 3 3 3 4 4 4
My method is an ugly one like this:
A        = [1 2;3 4];
scale    = 3;
B        = []; 
[M N]    = size(A);
for i = 1:M
    for j = 1:N
        B((((i-1)*scale)+1):(i*scale),(((j-1)*scale)+1):(j*scale)) = A(i,j);
    end
end
So, how can I resize or scale matrix up without using for loop?
Thanks for advice,
K. Pituso

Best Answer

B = kron(A, ones(3,3));
Related Question