TESTING/LIN/dsyt01.f(3)    Library Functions Manual    TESTING/LIN/dsyt01.f(3)

NAME
       TESTING/LIN/dsyt01.f

SYNOPSIS
   Functions/Subroutines
       subroutine dsyt01 (uplo, n, a, lda, afac, ldafac, ipiv, c, ldc, rwork,
           resid)
           DSYT01

Function/Subroutine Documentation
   subroutine dsyt01 (character uplo, integer n, double precision, dimension(
       lda, * ) a, integer lda, double precision, dimension( ldafac, * ) afac,
       integer ldafac, integer, dimension( * ) ipiv, double precision,
       dimension( ldc, * ) c, integer ldc, double precision, dimension( * )
       rwork, double precision resid)
       DSYT01

       Purpose:


            DSYT01 reconstructs a symmetric indefinite matrix A from its
            block L*D*L' or U*D*U' factorization and computes the residual
               norm( C - A ) / ( N * norm(A) * EPS ),
            where C is the reconstructed matrix and 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 (LDA,N)
                     The original symmetric matrix A.

           LDA

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

           AFAC

                     AFAC is DOUBLE PRECISION array, dimension (LDAFAC,N)
                     The factored form of the matrix A.  AFAC contains the block
                     diagonal matrix D and the multipliers used to obtain the
                     factor L or U from the block L*D*L' or U*D*U' factorization
                     as computed by DSYTRF.

           LDAFAC

                     LDAFAC is INTEGER
                     The leading dimension of the array AFAC.  LDAFAC >= max(1,N).

           IPIV

                     IPIV is INTEGER array, dimension (N)
                     The pivot indices from DSYTRF.

           C

                     C is DOUBLE PRECISION array, dimension (LDC,N)

           LDC

                     LDC is INTEGER
                     The leading dimension of the array C.  LDC >= max(1,N).

           RWORK

                     RWORK is DOUBLE PRECISION array, dimension (N)

           RESID

                     RESID is DOUBLE PRECISION
                     If UPLO = 'L', norm(L*D*L' - A) / ( N * norm(A) * EPS )
                     If UPLO = 'U', norm(U*D*U' - A) / ( N * norm(A) * EPS )

       Author
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Definition at line 122 of file dsyt01.f.

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

LAPACK                          Version 3.12.0         TESTING/LIN/dsyt01.f(3)