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.