_ldl_get_d_and_l(ldu, pivs, lower=True, hermitian=True)
The compact output returned by the LAPACK routing
The sanitized array of {0, 1, 2} denoting the sizes of the pivots. For every 2 there is a succeeding 0.
If set to False, upper triangular part is considered.
If set to False a symmetric complex array is assumed.
Helper function to extract the diagonal and triangular matrices for LDL.T factorization.
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