TESTING/LIN/sptt01.f(3)    Library Functions Manual    TESTING/LIN/sptt01.f(3)

NAME
       TESTING/LIN/sptt01.f

SYNOPSIS
   Functions/Subroutines
       subroutine sptt01 (n, d, e, df, ef, work, resid)
           SPTT01

Function/Subroutine Documentation
   subroutine sptt01 (integer n, real, dimension( * ) d, real, dimension( * )
       e, real, dimension( * ) df, real, dimension( * ) ef, real, dimension( *
       ) work, real resid)
       SPTT01

       Purpose:


            SPTT01 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 REAL array, dimension (N)
                     The n diagonal elements of the tridiagonal matrix A.

           E

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

           DF

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

           EF

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

           WORK

                     WORK is REAL array, dimension (2*N)

           RESID

                     RESID is REAL
                     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 sptt01.f.

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

LAPACK                          Version 3.12.0         TESTING/LIN/sptt01.f(3)