dget01.f - Man Page

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

Generated automatically by Doxygen for LAPACK from the source code.

Referenced By

The man page dget01(3) is an alias of dget01.f(3).

Tue Nov 28 2023 12:08:43 Version 3.12.0 LAPACK