SRC/checon.f(3)            Library Functions Manual            SRC/checon.f(3)

NAME
       SRC/checon.f

SYNOPSIS
   Functions/Subroutines
       subroutine checon (uplo, n, a, lda, ipiv, anorm, rcond, work, info)
           CHECON

Function/Subroutine Documentation
   subroutine checon (character uplo, integer n, complex, dimension( lda, * )
       a, integer lda, integer, dimension( * ) ipiv, real anorm, real rcond,
       complex, dimension( * ) work, integer info)
       CHECON

       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))).
           !>

       Parameters
           UPLO

           !>          UPLO is 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

           !>          N is INTEGER
           !>          The order of the matrix A.  N >= 0.
           !>

           A

           !>          A is 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

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

           IPIV

           !>          IPIV is INTEGER array, dimension (N)
           !>          Details of the interchanges and the block structure of D
           !>          as determined by CHETRF.
           !>

           ANORM

           !>          ANORM is REAL
           !>          The 1-norm of the original matrix A.
           !>

           RCOND

           !>          RCOND is 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

           !>          WORK is COMPLEX array, dimension (2*N)
           !>

           INFO

           !>          INFO is INTEGER
           !>          = 0:  successful exit
           !>          < 0:  if INFO = -i, the i-th argument had an illegal value
           !>

       Author
           Univ. of Tennessee


           Univ. of California Berkeley


           Univ. of Colorado Denver


           NAG Ltd.

       Definition at line 123 of file checon.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

LAPACK                          Version 3.12.0                 SRC/checon.f(3)