TESTING/LIN/zppt01.f(3)

NAME
TESTING/LIN/zppt01.f

SYNOPSIS

  Functions/Subroutines
subroutine zppt01 (uplo, n, a, afac, rwork, resid)
ZPPT01

Function/Subroutine Documentation

  subroutine zppt01 (character uplo, integer n, complex*16, dimension( * ) a, complex*16, dimension( * ) afac, double precision, dimension( * ) rwork, double precision resid)

ZPPT01

Purpose:

     ZPPT01 reconstructs a Hermitian 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, L' is the conjugate transpose of
     L, and U' is the conjugate transpose of U.

Parameters
    UPLO

              UPLO is CHARACTER*1
              Specifies whether the upper or lower triangular part of the
              Hermitian 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 COMPLEX*16 array, dimension (N*(N+1)/2)
              The original Hermitian matrix A, stored as a packed
              triangular matrix.

    AFAC

              AFAC is COMPLEX*16 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 94 of file zppt01.f.

Author

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