create_J_matrix function

Create a special matrix J

create_J_matrix generates a d x dp matrix J, where the first d x d block is the identity matrix I_d, and the rest is filled with zeros.

create_J_matrix(d, p)

Arguments

• d: An integer representing the dimension of the identity matrix.
• p: An integer representing the factor by which to extend the matrix with zeros.

Returns

A $d x dp$ matrix $J$ where the first $d x d$ block is the identity matrix $I_d$, and the rest is filled with zeros.