zhecon zhetrf zhetri zhetrs zhpcon zhptrf zhptri zhptrs

zhptri() void zhptri ( char  uplo, int  n, doublecomplex  ap[], int  ipiv[], doublecomplex  work[], int *  info  ) Inverse of a Hermitian matrix in packed form Purpose This routine computes the inverse of a Hermitian indefinite matrix A in packed form using the factorization A = U*D*U^H or A = L*D*L^H computed by zhptrf. Parameters [in] uplo Specifies whether the details of the factorization are stored as an upper or lower triangular matrix. = 'U': Upper triangular, form is A = U*D*U^H. = 'L': Lower triangular, form is A = L*D*L^H. [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 block diagonal matrix D and the multipliers used to obtain the factor U or L as computed by zhptrf, stored as a packed triangular matrix. [out] If info = 0, the (Hermitian) inverse of the original matrix, stored as a packed triangular matrix. The upper or lower triangular part of the inverse is stored in accordance with uplo. [in] ipiv[] Array ipiv[lipiv] (lipiv >= n) Details of the interchanges and the block structure of D as determined by zhptrf. [out] work[] Array work[lwork] (lwork >= n) Work array. [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 element of D is exactly zero; the matrix is singular and its inverse could not be computed. Reference LAPACK