TESTING/LIN/dget08.f(3)    Library Functions Manual    TESTING/LIN/dget08.f(3)

NAME
       TESTING/LIN/dget08.f

SYNOPSIS
   Functions/Subroutines
       subroutine dget08 (trans, m, n, nrhs, a, lda, x, ldx, b, ldb, rwork,
           resid)
           DGET08

Function/Subroutine Documentation
   subroutine dget08 (character trans, integer m, integer n, integer nrhs,
       double precision, dimension( lda, * ) a, integer lda, double precision,
       dimension( ldx, * ) x, integer ldx, double precision, dimension( ldb, *
       ) b, integer ldb, double precision, dimension( * ) rwork, double
       precision resid)
       DGET08

       Purpose:


            DGET08 computes the residual for a solution of a system of linear
            equations  A*x = b  or  A'*x = b:
               RESID = norm(B - A*X,inf) / ( norm(A,inf) * norm(X,inf) * EPS ),
            where EPS is the machine epsilon.

       Parameters
           TRANS

                     TRANS is CHARACTER*1
                     Specifies the form of the system of equations:
                     = 'N':  A *x = b
                     = 'T':  A'*x = b, where A' is the transpose of A
                     = 'C':  A'*x = b, where A' is the transpose of A

           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.

           NRHS

                     NRHS is INTEGER
                     The number of columns of B, the matrix of right hand sides.
                     NRHS >= 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).

           X

                     X is DOUBLE PRECISION array, dimension (LDX,NRHS)
                     The computed solution vectors for the system of linear
                     equations.

           LDX

                     LDX is INTEGER
                     The leading dimension of the array X.  If TRANS = 'N',
                     LDX >= max(1,N); if TRANS = 'T' or 'C', LDX >= max(1,M).

           B

                     B is DOUBLE PRECISION array, dimension (LDB,NRHS)
                     On entry, the right hand side vectors for the system of
                     linear equations.
                     On exit, B is overwritten with the difference B - A*X.

           LDB

                     LDB is INTEGER
                     The leading dimension of the array B.  IF TRANS = 'N',
                     LDB >= max(1,M); if TRANS = 'T' or 'C', LDB >= max(1,N).

           RWORK

                     RWORK is DOUBLE PRECISION array, dimension (M)

           RESID

                     RESID is DOUBLE PRECISION
                     The maximum over the number of right hand sides of
                     norm(B - A*X) / ( norm(A) * norm(X) * EPS ).

       Author
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Definition at line 131 of file dget08.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

LAPACK                          Version 3.12.0         TESTING/LIN/dget08.f(3)