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

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