TESTING/EIG/dget54.f(3)    Library Functions Manual    TESTING/EIG/dget54.f(3)

NAME
       TESTING/EIG/dget54.f

SYNOPSIS
   Functions/Subroutines
       subroutine dget54 (n, a, lda, b, ldb, s, lds, t, ldt, u, ldu, v, ldv,
           work, result)
           DGET54

Function/Subroutine Documentation
   subroutine dget54 (integer n, double precision, dimension( lda, * ) a,
       integer lda, double precision, dimension( ldb, * ) b, integer ldb,
       double precision, dimension( lds, * ) s, integer lds, double precision,
       dimension( ldt, * ) t, integer ldt, double precision, dimension( ldu, *
       ) u, integer ldu, double precision, dimension( ldv, * ) v, integer ldv,
       double precision, dimension( * ) work, double precision result)
       DGET54

       Purpose:


            DGET54 checks a generalized decomposition of the form

                     A = U*S*V'  and B = U*T* V'

            where ' means transpose and U and V are orthogonal.

            Specifically,

             RESULT = ||( A - U*S*V', B - U*T*V' )|| / (||( A, B )||*n*ulp )

       Parameters
           N

                     N is INTEGER
                     The size of the matrix.  If it is zero, DGET54 does nothing.
                     It must be at least zero.

           A

                     A is DOUBLE PRECISION array, dimension (LDA, N)
                     The original (unfactored) matrix A.

           LDA

                     LDA is INTEGER
                     The leading dimension of A.  It must be at least 1
                     and at least N.

           B

                     B is DOUBLE PRECISION array, dimension (LDB, N)
                     The original (unfactored) matrix B.

           LDB

                     LDB is INTEGER
                     The leading dimension of B.  It must be at least 1
                     and at least N.

           S

                     S is DOUBLE PRECISION array, dimension (LDS, N)
                     The factored matrix S.

           LDS

                     LDS is INTEGER
                     The leading dimension of S.  It must be at least 1
                     and at least N.

           T

                     T is DOUBLE PRECISION array, dimension (LDT, N)
                     The factored matrix T.

           LDT

                     LDT is INTEGER
                     The leading dimension of T.  It must be at least 1
                     and at least N.

           U

                     U is DOUBLE PRECISION array, dimension (LDU, N)
                     The orthogonal matrix on the left-hand side in the
                     decomposition.

           LDU

                     LDU is INTEGER
                     The leading dimension of U.  LDU must be at least N and
                     at least 1.

           V

                     V is DOUBLE PRECISION array, dimension (LDV, N)
                     The orthogonal matrix on the left-hand side in the
                     decomposition.

           LDV

                     LDV is INTEGER
                     The leading dimension of V.  LDV must be at least N and
                     at least 1.

           WORK

                     WORK is DOUBLE PRECISION array, dimension (3*N**2)

           RESULT

                     RESULT is DOUBLE PRECISION
                     The value RESULT, It is currently limited to 1/ulp, to
                     avoid overflow. Errors are flagged by RESULT=10/ulp.

       Author
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Definition at line 154 of file dget54.f.

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

LAPACK                          Version 3.12.0         TESTING/EIG/dget54.f(3)