table of contents
/home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/LIN/dppt01.f(3) | Library Functions Manual | /home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/LIN/dppt01.f(3) |
NAME¶
/home/abuild/rpmbuild/BUILD/lapack-3.12.0/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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