TESTING/LIN/dget01.f(3)

NAME
TESTING/LIN/dget01.f

SYNOPSIS

  Functions/Subroutines
subroutine dget01 (m, n, a, lda, afac, ldafac, ipiv, rwork, resid)
DGET01

Function/Subroutine Documentation

  subroutine dget01 (integer m, integer n, double precision, dimension( lda, * ) a, integer lda, double precision, dimension( ldafac, * ) afac, integer ldafac, integer, dimension( * ) ipiv, double precision, dimension( * ) rwork, double precision resid)

DGET01

Purpose:

    !>
    !> DGET01 reconstructs a matrix A from its L*U factorization and
    !> computes the residual
    !>    norm(L*U - A) / ( N * norm(A) * EPS ),
    !> where EPS is the machine epsilon.
    !>

Parameters
    M

    !>          M is INTEGER
    !>          The number of rows of the matrix A.  M >= 0.
    !>

    N

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

    A

    !>          A is DOUBLE PRECISION array, dimension (LDA,N)
    !>          The original M x N matrix A.
    !>

    LDA

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

    AFAC

    !>          AFAC is DOUBLE PRECISION array, dimension (LDAFAC,N)
    !>          The factored form of the matrix A.  AFAC contains the factors
    !>          L and U from the L*U factorization as computed by DGETRF.
    !>          Overwritten with the reconstructed matrix, and then with the
    !>          difference L*U - A.
    !>

    LDAFAC

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

    IPIV

    !>          IPIV is INTEGER array, dimension (N)
    !>          The pivot indices from DGETRF.
    !>

    RWORK

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

    RESID

    !>          RESID is DOUBLE PRECISION
    !>          norm(L*U - A) / ( N * norm(A) * EPS )
    !>

Author
    Univ. of Tennessee

    Univ. of California Berkeley

    Univ. of Colorado Denver

    NAG Ltd.

Definition at line 105 of file dget01.f.

Author

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