TESTING/LIN/dget02.f(3)    Library Functions Manual    TESTING/LIN/dget02.f(3)

NAME
       TESTING/LIN/dget02.f

SYNOPSIS
   Functions/Subroutines
       subroutine dget02 (trans, m, n, nrhs, a, lda, x, ldx, b, ldb, rwork,
           resid)
           DGET02

Function/Subroutine Documentation
   subroutine dget02 (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)
       DGET02

       Purpose:


            DGET02 computes the residual for a solution of a system of linear
            equations op(A)*X = B:
               RESID = norm(B - op(A)*X) / ( norm(op(A)) * norm(X) * EPS ),
            where op(A) = A or A**T, depending on TRANS, and EPS is the
            machine epsilon.
            The norm used is the 1-norm.

       Parameters
           TRANS

                     TRANS is CHARACTER*1
                     Specifies the form of the system of equations:
                     = 'N':  A    * X = B  (No transpose)
                     = 'T':  A**T * X = B  (Transpose)
                     = 'C':  A**H * X = B  (Conjugate transpose = Transpose)

           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 - op(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 - op(A)*X) / ( norm(op(A)) * norm(X) * EPS ).

       Author
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Definition at line 133 of file dget02.f.

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

LAPACK                          Version 3.12.0         TESTING/LIN/dget02.f(3)