zhpt013
Part of zhpt01.f(3).
Usage
Functions/Subroutines
subroutine zhpt01 (uplo, n, a, afac, ipiv, c, ldc, rwork, resid)
ZHPT01
Function/Subroutine Documentation
subroutine zhpt01 (character uplo, integer n, complex*16, dimension( * ) a, complex*16, dimension( * ) afac, integer, dimension( * ) ipiv, complex*16, dimension( ldc, * ) c, integer ldc, double precision, dimension( * ) rwork, double precision resid)
ZHPT01
Purpose:
!> !> ZHPT01 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*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) !> 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 ZHPTRF. !>
IPIV
!> IPIV is INTEGER array, dimension (N) !> The pivot indices from ZHPTRF. !>
C
!> C is COMPLEX*16 array, dimension (LDC,N) !>
LDC
!> LDC is INTEGER !> The leading dimension of the array C. LDC >= max(1,N). !>
RWORK
!> RWORK is DOUBLE PRECISION array, dimension (N) !>
RESID
!> RESID is DOUBLE PRECISION !> 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 zhpt01.f.