zpocon zpotrf zpotri zpotrs zppcon zpptrf zpptri zpptrs

zpptri() void zpptri ( char  uplo, int  n, doublecomplex  ap[], int *  info  ) Inverse of a Hermitian positive definite matrix in packed form Purpose This routine computes the inverse of a Hermitian positive definite matrix A in packed form using the Cholesky factorization A = U^H*U or A = L*L^H computed by zpptrf. Parameters [in] uplo = 'U': Upper triangular factor U is stored in ap[]. = 'L': Lower triangular factor L is stored in ap[]. [in] n Order of the matrix A. (n >= 0) (If n = 0, returns without computation) [in,out] ap[] Array ap[lap] (lap >= n(n + 1)/2) [in] The triangular factor U or L in packed form from the Cholesky factorization A = U^H*U or A = L*L^H, as computed by zpptrf. [out] If info = 0, the upper or lower triangle of the (Hermitian) inverse of A, overwriting the input factor U or L. [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) = i > 0: The i-th diagonal element of the factor U or L is zero, and the inverse could not be computed. Reference LAPACK