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/home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/LIN/dget01.f(3) Library Functions Manual /home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/LIN/dget01.f(3)

NAME

/home/abuild/rpmbuild/BUILD/lapack-3.12.0/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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Version 3.12.0 LAPACK