TESTING/LIN/dppt01.f(3)    Library Functions Manual    TESTING/LIN/dppt01.f(3)

NAME
       TESTING/LIN/dppt01.f

SYNOPSIS
   Functions/Subroutines
       subroutine dppt01 (uplo, n, a, afac, rwork, resid)
           DPPT01

Function/Subroutine Documentation
   subroutine dppt01 (character uplo, integer n, double precision, dimension(
       * ) a, double precision, dimension( * ) afac, double precision,
       dimension( * ) rwork, double precision resid)
       DPPT01

       Purpose:


            DPPT01 reconstructs a symmetric positive definite packed matrix A
            from its L*L' or U'*U factorization and computes the residual
               norm( L*L' - A ) / ( N * norm(A) * EPS ) or
               norm( U'*U - A ) / ( N * norm(A) * EPS ),
            where EPS is the machine epsilon.

       Parameters
           UPLO

                     UPLO is CHARACTER*1
                     Specifies whether the upper or lower triangular part of the
                     symmetric matrix A is stored:
                     = 'U':  Upper triangular
                     = 'L':  Lower triangular

           N

                     N is INTEGER
                     The number of rows and columns of the matrix A.  N >= 0.

           A

                     A is DOUBLE PRECISION array, dimension (N*(N+1)/2)
                     The original symmetric matrix A, stored as a packed
                     triangular matrix.

           AFAC

                     AFAC is DOUBLE PRECISION array, dimension (N*(N+1)/2)
                     On entry, the factor L or U from the L*L' or U'*U
                     factorization of A, stored as a packed triangular matrix.
                     Overwritten with the reconstructed matrix, and then with the
                     difference L*L' - A (or U'*U - A).

           RWORK

                     RWORK is DOUBLE PRECISION array, dimension (N)

           RESID

                     RESID is DOUBLE PRECISION
                     If UPLO = 'L', norm(L*L' - A) / ( N * norm(A) * EPS )
                     If UPLO = 'U', norm(U'*U - A) / ( N * norm(A) * EPS )

       Author
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Definition at line 92 of file dppt01.f.

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

LAPACK                          Version 3.12.0         TESTING/LIN/dppt01.f(3)