Modifying a matrix such that each entry can be written in a block of four

Hi,

I have a matrix, say

A = [1 2
    3 4];

I want to modify it in such a way that it can be written as

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

Each entry in the matrix A can be written in a block of four. How can I code it?

Answer 1

[Walter Roberson]

A = [1 2
    3 4]

A = 2×2

1 2 3 4

B = kron(A, ones(2,2))

B = 4×4

1 1 2 2 1 1 2 2 3 3 4 4 3 3 4 4

C = repelem(A, 2, 2)

C = 4×4

1 1 2 2 1 1 2 2 3 3 4 4 3 3 4 4

Answer 2

[Yamina chbak]

a=[1 2 ; 3 4];
A=zeros(2*size(a));
A(1:2,1:2)=a(1);
A(1:2,3:4)=a(3);
A(3:4,1:2)=a(2);
A(3:4,3:4)=a(4);
A

A = 4×4

1 1 2 2 1 1 2 2 3 3 4 4 3 3 4 4