Rechercher une page de manuel
dla_gercond.3lapack
Langue: en
Version: 294853 (debian - 07/07/09)
Section: 3 (Bibliothèques de fonctions)
NAME
DLA_GERCOND - DLA_GERCOND estimate the Skeel condition number of op(A) * op2(C) where op2 is determined by CMODE as follows CMODE = 1 op2(C) = C CMODE = 0 op2(C) = I CMODE = -1 op2(C) = inv(C) The Skeel condition number cond(A) = norminf( |inv(A)||A| ) is computed by computing scaling factors R such that diag(R)*A*op2(C) is row equilibrated and computing the standard infinity-norm condition numberSYNOPSIS
- DOUBLE PRECISION
- FUNCTION DLA_GERCOND ( TRANS, N, A, LDA, AF, LDAF, IPIV, CMODE, C, INFO, WORK, IWORK )
- IMPLICIT NONE
- CHARACTER TRANS
- INTEGER N, LDA, LDAF, INFO, CMODE
- INTEGER IPIV( * ), IWORK( * )
- DOUBLE PRECISION A( LDA, * ), AF( LDAF, * ), WORK( * ), C( * )
PURPOSE
DLA_GERCOND estimates the Skeel condition number of op(A) * op2(C)
where op2 is determined by CMODE as follows
CMODE = 1 op2(C) = C
CMODE = 0 op2(C) = I
CMODE = -1 op2(C) = inv(C)
The Skeel condition number cond(A) = norminf( |inv(A)||A| )
is computed by computing scaling factors R such that
diag(R)*A*op2(C) is row equilibrated and computing the standard
infinity-norm condition number.
ARGUMENTS
- WORK DOUBLE PRECISION workspace of size 3*N, and
- IWORK INTEGER workspace of size N.
Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre