TESTING/LIN/chpt01.f(3)

NAME
TESTING/LIN/chpt01.f

SYNOPSIS

  Functions/Subroutines
subroutine chpt01 (uplo, n, a, afac, ipiv, c, ldc, rwork, resid)
CHPT01

Function/Subroutine Documentation

  subroutine chpt01 (character uplo, integer n, complex, dimension( * ) a, complex, dimension( * ) afac, integer, dimension( * ) ipiv, complex, dimension( ldc, * ) c, integer ldc, real, dimension( * ) rwork, real resid)

CHPT01

Purpose:

     CHPT01 reconstructs a Hermitian indefinite packed matrix A from its
     block L*D*L' or U*D*U' factorization and computes the residual
        norm( C - A ) / ( N * norm(A) * EPS ),
     where C is the reconstructed matrix, 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 array, dimension (N*(N+1)/2)
              The original Hermitian matrix A, stored as a packed
              triangular matrix.

    AFAC

              AFAC is COMPLEX array, dimension (N*(N+1)/2)
              The factored form of the matrix A, stored as a packed
              triangular matrix.  AFAC contains the block diagonal matrix D
              and the multipliers used to obtain the factor L or U from the
              block L*D*L' or U*D*U' factorization as computed by CHPTRF.

    IPIV

              IPIV is INTEGER array, dimension (N)
              The pivot indices from CHPTRF.

    C

              C is COMPLEX array, dimension (LDC,N)

    LDC

              LDC is INTEGER
              The leading dimension of the array C.  LDC >= max(1,N).

    RWORK

              RWORK is REAL array, dimension (N)

    RESID

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

Author
    Univ. of Tennessee

    Univ. of California Berkeley

    Univ. of Colorado Denver

    NAG Ltd.

Definition at line 112 of file chpt01.f.

Author

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