2D non-Square Matrix to 2D square matrix

How to make a matrix A with diamension m x n , m,n>1 to a square matrix ?

Answer 1

[madhan ravi]

Wanted = nan(length(A));
Wanted(1:numel(A)) = A

[Manoj Kumar]

In case if we want to insert zero in place of NaN then ??

[madhan ravi]

instead of nan() use zeros()

[Manoj Kumar]

Thanks a lot !