Provided by: liblapack-doc_3.3.1-1_all bug

NAME

       LAPACK-3  -  computes  the  inverse  of  a COMPLEX hermitian indefinite matrix A using the
       factorization A = U*D*U**T or A = L*D*L**T computed by CHETRF

SYNOPSIS

       SUBROUTINE CHETRI2( UPLO, N, A, LDA, IPIV, WORK, LWORK, INFO )

           CHARACTER       UPLO

           INTEGER         INFO, LDA, LWORK, N

           INTEGER         IPIV( * )

           COMPLEX         A( LDA, * ), WORK( * )

PURPOSE

       CHETRI2 computes the inverse  of  a  COMPLEX  hermitian  indefinite  matrix  A  using  the
       factorization  A  =  U*D*U**T  or A = L*D*L**T computed by CHETRF. CHETRI2 set the LEADING
       DIMENSION of the workspace
        before calling CHETRI2X that actually computes the inverse.

ARGUMENTS

        UPLO    (input) CHARACTER*1
                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**T;
                = 'L':  Lower triangular, form is A = L*D*L**T.

        N       (input) INTEGER
                The order of the matrix A.  N >= 0.

        A       (input/output) COMPLEX array, dimension (LDA,N)
                On entry, the NB diagonal matrix D and the multipliers
                used to obtain the factor U or L as computed by CHETRF.
                On exit, if INFO = 0, the (symmetric) inverse of the original
                matrix.  If UPLO = 'U', the upper triangular part of the
                inverse is formed and the part of A below the diagonal is not
                referenced; if UPLO = 'L' the lower triangular part of the
                inverse is formed and the part of A above the diagonal is
                not referenced.

        LDA     (input) INTEGER
                The leading dimension of the array A.  LDA >= max(1,N).

        IPIV    (input) INTEGER array, dimension (N)
                Details of the interchanges and the NB structure of D
                as determined by CHETRF.

        WORK    (workspace) COMPLEX array, dimension (N+NB+1)*(NB+3)

        LWORK   (input) INTEGER
                The dimension of the array WORK.
                WORK is size >= (N+NB+1)*(NB+3)
                If LDWORK = -1, then a workspace query is assumed; the routine
                calculates:
                - the optimal size of the WORK array, returns
                this value as the first entry of the WORK array,
                - and no error message related to LDWORK is issued by XERBLA.

        INFO    (output) INTEGER
                = 0: successful exit
                < 0: if INFO = -i, the i-th argument had an illegal value
                > 0: if INFO = i, D(i,i) = 0; the matrix is singular and its
                inverse could not be computed.

 LAPACK routine (version 3.3.1)             April 2011                           CHETRI2(3lapack)