TESTING/LIN/dptt01.f(3)    Library Functions Manual    TESTING/LIN/dptt01.f(3)

NAME
       TESTING/LIN/dptt01.f

SYNOPSIS
   Functions/Subroutines
       subroutine dptt01 (n, d, e, df, ef, work, resid)
           DPTT01

Function/Subroutine Documentation
   subroutine dptt01 (integer n, double precision, dimension( * ) d, double
       precision, dimension( * ) e, double precision, dimension( * ) df,
       double precision, dimension( * ) ef, double precision, dimension( * )
       work, double precision resid)
       DPTT01

       Purpose:


            DPTT01 reconstructs a tridiagonal matrix A from its L*D*L'
            factorization and computes the residual
               norm(L*D*L' - A) / ( n * norm(A) * EPS ),
            where EPS is the machine epsilon.

       Parameters
           N

                     N is INTEGER
                     The order of the matrix A.

           D

                     D is DOUBLE PRECISION array, dimension (N)
                     The n diagonal elements of the tridiagonal matrix A.

           E

                     E is DOUBLE PRECISION array, dimension (N-1)
                     The (n-1) subdiagonal elements of the tridiagonal matrix A.

           DF

                     DF is DOUBLE PRECISION array, dimension (N)
                     The n diagonal elements of the factor L from the L*D*L'
                     factorization of A.

           EF

                     EF is DOUBLE PRECISION array, dimension (N-1)
                     The (n-1) subdiagonal elements of the factor L from the
                     L*D*L' factorization of A.

           WORK

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

           RESID

                     RESID is DOUBLE PRECISION
                     norm(L*D*L' - A) / (n * norm(A) * EPS)

       Author
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Definition at line 90 of file dptt01.f.

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

LAPACK                          Version 3.12.0         TESTING/LIN/dptt01.f(3)