`scipy.linalg._flapack:zpptrf`

Signature

def zpptrf(n, ap, lower = 0, overwrite_ap = 0)

Compute the Cholesky factorization of a positive definite matrix in packed storage (LAPACK zpptrf).

n : int: Order of the square matrix.
ap : ndarray: The triangle named by lower, in packed storage: the n * (n + 1) / 2 elements of one triangle, column by column. A longer array is accepted and its tail ignored.
lower : int, optional: If nonzero, the lower triangle of a is referenced and the factor is lower triangular; otherwise the upper. Default is 0.
overwrite_ap : int, optional: If nonzero, ap may be overwritten in place. Default is 0.

ul : ndarray: The Cholesky factor in packed storage, overwriting ap.
info : int: 0 on success; if negative, the -info-th argument had an illegal value.