TESTING/EIG/dbdt02.f(3)    Library Functions Manual    TESTING/EIG/dbdt02.f(3)

NAME
       TESTING/EIG/dbdt02.f

SYNOPSIS
   Functions/Subroutines
       subroutine dbdt02 (m, n, b, ldb, c, ldc, u, ldu, work, resid)
           DBDT02

Function/Subroutine Documentation
   subroutine dbdt02 (integer m, integer n, double precision, dimension( ldb,
       * ) b, integer ldb, double precision, dimension( ldc, * ) c, integer
       ldc, double precision, dimension( ldu, * ) u, integer ldu, double
       precision, dimension( * ) work, double precision resid)
       DBDT02

       Purpose:


            DBDT02 tests the change of basis C = U**H * B by computing the
            residual

               RESID = norm(B - U * C) / ( max(m,n) * norm(B) * EPS ),

            where B and C are M by N matrices, U is an M by M orthogonal matrix,
            and EPS is the machine precision.

       Parameters
           M

                     M is INTEGER
                     The number of rows of the matrices B and C and the order of
                     the matrix Q.

           N

                     N is INTEGER
                     The number of columns of the matrices B and C.

           B

                     B is DOUBLE PRECISION array, dimension (LDB,N)
                     The m by n matrix B.

           LDB

                     LDB is INTEGER
                     The leading dimension of the array B.  LDB >= max(1,M).

           C

                     C is DOUBLE PRECISION array, dimension (LDC,N)
                     The m by n matrix C, assumed to contain U**H * B.

           LDC

                     LDC is INTEGER
                     The leading dimension of the array C.  LDC >= max(1,M).

           U

                     U is DOUBLE PRECISION array, dimension (LDU,M)
                     The m by m orthogonal matrix U.

           LDU

                     LDU is INTEGER
                     The leading dimension of the array U.  LDU >= max(1,M).

           WORK

                     WORK is DOUBLE PRECISION array, dimension (M)

           RESID

                     RESID is DOUBLE PRECISION
                     RESID = norm(B - U * C) / ( max(m,n) * norm(B) * EPS ),

       Author
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Definition at line 111 of file dbdt02.f.

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

LAPACK                          Version 3.12.0         TESTING/EIG/dbdt02.f(3)