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

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