nag_lapacklin_zpttrf (f07jrc) Example Program Results Details of factorization The diagonal elements of D 16.0000 9.0000 1.0000 4.0000 Subdiagonal elements of the Cholesky factor L ( 1.0000, 1.0000) ( 2.0000, -1.0000) ( 1.0000, -4.0000)