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

NAME
       SRC/zppcon.f

SYNOPSIS
   Functions/Subroutines
       subroutine zppcon (uplo, n, ap, anorm, rcond, work, rwork, info)
           ZPPCON

Function/Subroutine Documentation
   subroutine zppcon (character uplo, integer n, complex*16, dimension( * )
       ap, double precision anorm, double precision rcond, complex*16,
       dimension( * ) work, double precision, dimension( * ) rwork, integer
       info)
       ZPPCON

       Purpose:


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

           N

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

           AP

           !>          AP is COMPLEX*16 array, dimension (N*(N+1)/2)
           !>          The triangular factor U or L from the Cholesky factorization
           !>          A = U**H*U or A = L*L**H, packed columnwise in a linear
           !>          array.  The j-th column of U or L is stored in the array AP
           !>          as follows:
           !>          if UPLO = 'U', AP(i + (j-1)*j/2) = U(i,j) for 1<=i<=j;
           !>          if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = L(i,j) for j<=i<=n.
           !>

           ANORM

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

           RCOND

           !>          RCOND is 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

           !>          WORK is COMPLEX*16 array, dimension (2*N)
           !>

           RWORK

           !>          RWORK is DOUBLE PRECISION array, dimension (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 117 of file zppcon.f.

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

LAPACK                          Version 3.12.0                 SRC/zppcon.f(3)