table of contents
/home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/LIN/dsyt01_aa.f(3) | Library Functions Manual | /home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/LIN/dsyt01_aa.f(3) |
NAME¶
/home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/LIN/dsyt01_aa.f
SYNOPSIS¶
Functions/Subroutines¶
subroutine DSYT01_AA (uplo, n, a, lda, afac, ldafac, ipiv,
c, ldc, rwork, resid)
DSYT01
Function/Subroutine Documentation¶
subroutine DSYT01_AA (character uplo, integer n, double precision, dimension( lda, * ) a, integer lda, double precision, dimension( ldafac, * ) afac, integer ldafac, integer, dimension( * ) ipiv, double precision, dimension( ldc, * ) c, integer ldc, double precision, dimension( * ) rwork, double precision resid)¶
DSYT01
Purpose:
!> !> DSYT01 reconstructs a symmetric indefinite 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 and 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 (LDA,N) !> The original symmetric matrix A. !>
LDA
!> LDA is INTEGER !> The leading dimension of the array A. LDA >= max(1,N) !>
AFAC
!> AFAC is DOUBLE PRECISION array, dimension (LDAFAC,N) !> The factored form of the matrix A. 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 DSYTRF. !>
LDAFAC
!> LDAFAC is INTEGER !> The leading dimension of the array AFAC. LDAFAC >= max(1,N). !>
IPIV
!> IPIV is INTEGER array, dimension (N) !> The pivot indices from DSYTRF. !>
C
!> C is DOUBLE PRECISION 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 122 of file dsyt01_aa.f.
Author¶
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