TESTING/LIN/dppt03.f(3) Library Functions Manual TESTING/LIN/dppt03.f(3)

TESTING/LIN/dppt03.f


subroutine dppt03 (uplo, n, a, ainv, work, ldwork, rwork, rcond, resid)
DPPT03

DPPT03

Purpose:

!>
!> DPPT03 computes the residual for a symmetric packed matrix times its
!> inverse:
!>    norm( I - A*AINV ) / ( N * norm(A) * norm(AINV) * EPS ),
!> where EPS is the machine epsilon.
!> 

Parameters

UPLO
!>          UPLO is CHARACTER*1
!>          Specifies whether the upper or lower triangular part of the
!>          symmetric matrix A is stored:
!>          = 'U':  Upper triangular
!>          = 'L':  Lower triangular
!> 

N

!>          N is INTEGER
!>          The number of rows and columns of the matrix A.  N >= 0.
!> 

A

!>          A is DOUBLE PRECISION array, dimension (N*(N+1)/2)
!>          The original symmetric matrix A, stored as a packed
!>          triangular matrix.
!> 

AINV

!>          AINV is DOUBLE PRECISION array, dimension (N*(N+1)/2)
!>          The (symmetric) inverse of the matrix A, stored as a packed
!>          triangular matrix.
!> 

WORK

!>          WORK is DOUBLE PRECISION array, dimension (LDWORK,N)
!> 

LDWORK

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

RWORK

!>          RWORK is DOUBLE PRECISION array, dimension (N)
!> 

RCOND

!>          RCOND is DOUBLE PRECISION
!>          The reciprocal of the condition number of A, computed as
!>          ( 1/norm(A) ) / norm(AINV).
!> 

RESID

!>          RESID is DOUBLE PRECISION
!>          norm(I - A*AINV) / ( N * norm(A) * norm(AINV) * EPS )
!> 

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 108 of file dppt03.f.

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