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

NAME

       LAPACK-3  -  estimates the reciprocal of the condition number (in the 1-norm) of a complex
       Hermitian positive definite matrix using the Cholesky factorization A  =  U**H*U  or  A  =
       L*L**H computed by ZPOTRF

SYNOPSIS

       SUBROUTINE ZPOCON( UPLO, N, A, LDA, ANORM, RCOND, WORK, RWORK, INFO )

           CHARACTER      UPLO

           INTEGER        INFO, LDA, N

           DOUBLE         PRECISION ANORM, RCOND

           DOUBLE         PRECISION RWORK( * )

           COMPLEX*16     A( LDA, * ), WORK( * )

PURPOSE

       ZPOCON  estimates  the  reciprocal  of  the  condition number (in the 1-norm) of a complex
       Hermitian positive definite matrix using the Cholesky factorization A  =  U**H*U  or  A  =
       L*L**H computed by ZPOTRF.
        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
                = 'U':  Upper triangle of A is stored;
                = 'L':  Lower triangle of A is stored.

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

        A       (input) COMPLEX*16 array, dimension (LDA,N)
                The triangular factor U or L from the Cholesky factorization
                A = U**H*U or A = L*L**H, as computed by ZPOTRF.

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

        ANORM   (input) DOUBLE PRECISION
                The 1-norm (or infinity-norm) of the Hermitian matrix A.

        RCOND   (output) DOUBLE PRECISION
                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*16 array, dimension (2*N)

        RWORK   (workspace) DOUBLE PRECISION array, dimension (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                            ZPOCON(3lapack)