scipy.linalg.lapack.zpttrf#

scipy.linalg.lapack.zpttrf(d, e, overwrite_d=0, overwrite_e=0) = <flapack function zpttrf>#

Compute the L @ D @ L.conj().T factorization of a positive definite tridiagonal matrix (LAPACK zpttrf).

Parameters:

dndarray: Diagonal of the matrix, length n. Real for every flavor.
endarray: Off-diagonal, length max(0, n - 1).
overwrite_dint, optional: If nonzero, d may be overwritten in place. Default is 0.
overwrite_eint, optional: If nonzero, e may be overwritten in place. Default is 0.

Returns:

dndarray: Diagonal of D.
endarray: Off-diagonal of the unit bidiagonal L.
infoint: 0 on success; if negative, the -info-th argument had an illegal value; if positive, the leading minor of order info is not positive definite.