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Compute the Cholesky factor, l, of the symmetric positive definite sparse matrix a, where
l * l' = a.If called with 2 or more outputs p is the 0 when l is positive definite and l is a positive integer otherwise.
If called with 3 outputs that a sparsity preserving row/column permutation is applied to a prior to the factorization. That is l is the factorization of a
(q,q)such thatr * r' = a (q, q).Note that
splcholfactorizations is faster and use less memory thanspchol.splchol(a)is equivalent tospchol(a)'.See also: spcholinv, spchol2inv, splchol.