Return the Pascal matrix of order n if t
= 0. t defaults to 0. Return lower triangular Cholesky factor of the Pascal matrix if t= 1. This matrix is its own inverse, that ispascal (n, 1) ^ 2 == eye (n). If t= 2, return a transposed and permuted version ofpascal (n, 1), which is the cube-root of the identity matrix. That ispascal (n, 2) ^ 3 == eye (n).