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

NAME

       LAPACK-3  - estimates the reciprocal of the condition number of a complex Hermitian matrix
       A using the factorization A = U*D*U**H or A = L*D*L**H computed by CHETRF

SYNOPSIS

       SUBROUTINE CHECON( UPLO, N, A, LDA, IPIV, ANORM, RCOND, WORK, INFO )

           CHARACTER      UPLO

           INTEGER        INFO, LDA, N

           REAL           ANORM, RCOND

           INTEGER        IPIV( * )

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

PURPOSE

       CHECON estimates the reciprocal of the condition number of a complex  Hermitian  matrix  A
       using the factorization A = U*D*U**H or A = L*D*L**H computed by CHETRF.
        An estimate is obtained for norm(inv(A)), and the reciprocal of the
        condition number is computed as RCOND = 1 / (ANORM * norm(inv(A))).

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**H;
                = 'L':  Lower triangular, form is A = L*D*L**H.

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

        A       (input) COMPLEX array, dimension (LDA,N)
                The block diagonal matrix D and the multipliers used to
                obtain the factor U or L as computed by CHETRF.

        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 block structure of D
                as determined by CHETRF.

        ANORM   (input) REAL
                The 1-norm of the original matrix A.

        RCOND   (output) REAL
                The reciprocal of the condition number of the matrix A,
                computed as RCOND = 1/(ANORM * AINVNM), where AINVNM is an
                estimate of the 1-norm of inv(A) computed in this routine.

        WORK    (workspace) COMPLEX array, dimension (2*N)

        INFO    (output) INTEGER
                = 0:  successful exit
                < 0:  if INFO = -i, the i-th argument had an illegal value

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