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

NAME
       SRC/sspcon.f

SYNOPSIS
   Functions/Subroutines
       subroutine sspcon (uplo, n, ap, ipiv, anorm, rcond, work, iwork, info)
           SSPCON

Function/Subroutine Documentation
   subroutine sspcon (character uplo, integer n, real, dimension( * ) ap,
       integer, dimension( * ) ipiv, real anorm, real rcond, real, dimension(
       * ) work, integer, dimension( * ) iwork, integer info)
       SSPCON

       Purpose:


           !>
           !> SSPCON estimates the reciprocal of the condition number (in the
           !> 1-norm) of a real symmetric packed matrix A using the factorization
           !> A = U*D*U**T or A = L*D*L**T computed by SSPTRF.
           !>
           !> 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**T;
           !>          = 'L':  Lower triangular, form is A = L*D*L**T.
           !>

           N

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

           AP

           !>          AP is REAL array, dimension (N*(N+1)/2)
           !>          The block diagonal matrix D and the multipliers used to
           !>          obtain the factor U or L as computed by SSPTRF, stored as a
           !>          packed triangular matrix.
           !>

           IPIV

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

           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 REAL array, dimension (2*N)
           !>

           IWORK

           !>          IWORK is INTEGER 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 123 of file sspcon.f.

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

LAPACK                          Version 3.12.0                 SRC/sspcon.f(3)