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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