zpocon zpotrf zpotri zpotrs zppcon zpptrf zpptri zpptrs

zpotrf() void zpotrf ( char  uplo, int  n, int  lda, doublecomplex  a[], int *  info  ) Cholesky factorization of a Hermitian positive definite matrix Purpose This routine computes the Cholesky factorization of a Hermitian positive definite matrix A. The factorization has the form A = U^H * U, if uplo = 'U', or A = L * L^H, if uplo = 'L', where U is an upper triangular matrix and L is a lower triangular matrix. This is the blocked version of the algorithm, calling Level 3 BLAS. Parameters [in] uplo = 'U': Upper triangle of A is stored. = 'L': Lower triangle of A is stored. [in] n Order of the matrix A. (n >= 0) (If n = 0, returns without computation) [in] lda Leading dimension of the two dimensional array a[][]. (lda >= max(1, n)) [in,out] a[][] Array a[la][lda] (la >= n) [in] n x n Hermitian positive definite matrix A. The upper or lower triangular part is to be referenced in accordance with uplo. [out] If info = 0, the factor U or L from the Cholesky factorization A = U^H*U or A = L*L^H. [out] info = 0: Successful exit = -1: The argument uplo had an illegal value (uplo != 'U' nor 'L') = -2: The argument n had an illegal value (n < 0) = -3: The argument lda had an illegal value (lda < max(1, n)) = i > 0: The leading minor of order i is not positive definite, and the factorization could not be completed. Reference LAPACK