sla_syrpvgrw.f(3) LAPACK sla_syrpvgrw.f(3)
REAL function sla_syrpvgrw (UPLO, N, INFO, A, LDA, AF, LDAF, IPIV, WORK)
SLA_SYRPVGRW computes the reciprocal pivot growth factor norm(A)/norm(U) for a
symmetric indefinite matrix.
REAL function sla_syrpvgrw (character*1UPLO, integerN, integerINFO, real, dimension( lda, *
)A, integerLDA, real, dimension( ldaf, * )AF, integerLDAF, integer, dimension( * )IPIV,
real, dimension( * )WORK)
SLA_SYRPVGRW computes the reciprocal pivot growth factor norm(A)/norm(U) for a symmetric
SLA_SYRPVGRW computes the reciprocal pivot growth factor
norm(A)/norm(U). The "max absolute element" norm is used. If this is
much less than 1, the stability of the LU factorization of the
(equilibrated) matrix A could be poor. This also means that the
solution X, estimated condition numbers, and error bounds could be
UPLO is CHARACTER*1
= 'U': Upper triangle of A is stored;
= 'L': Lower triangle of A is stored.
N is INTEGER
The number of linear equations, i.e., the order of the
matrix A. N >= 0.
INFO is INTEGER
The value of INFO returned from SSYTRF, .i.e., the pivot in
column INFO is exactly 0.
A is REAL array, dimension (LDA,N)
On entry, the N-by-N matrix A.
LDA is INTEGER
The leading dimension of the array A. LDA >= max(1,N).
AF is REAL array, dimension (LDAF,N)
The block diagonal matrix D and the multipliers used to
obtain the factor U or L as computed by SSYTRF.
LDAF is INTEGER
The leading dimension of the array AF. LDAF >= max(1,N).
IPIV is INTEGER array, dimension (N)
Details of the interchanges and the block structure of D
as determined by SSYTRF.
WORK is REAL array, dimension (2*N)
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
Definition at line 122 of file sla_syrpvgrw.f.
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Version 3.4.2 Tue Sep 25 2012 sla_syrpvgrw.f(3)