up sampling a matrix with non-zero elements.

Hello

I have a matrix A(100 by 100) and I want to upsample the matrix (not by zero arrays) in a way the each cell is replicated in its 3 by 3 neighborhood. So I will have a a 9 cell instead of each cell which I have had at first.

Any suggestion??

[Conrad]

Considering the case where [A] = 2x2, you want something like this?

A = [1 2;...
     3 4];

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];

[Andrea]

yes, exactly I want something like this. So..

Answer 1

[Honglei Chen]

You can use kron

A = [1 2;3 4];
B = kron(A,ones(3))