SLA_GBRCONDLAPACK routine (version 3.2)SLA_GBRCOND(1)NAMESLA_GBRCOND - SLA_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 = -1op2(C) = inv(C) The Skeel condiā
tion 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
SYNOPSIS
REAL FUNCTION SLA_GBRCOND( TRANS, N, KL, KU, AB, LDAB, AFB, LDAFB,
IPIV, CMODE, C, INFO, WORK, IWORK )
IMPLICIT NONE
CHARACTER TRANS
INTEGER N, LDAB, LDAFB, INFO, KL, KU, CMODE
INTEGER IWORK( * ), IPIV( * )
REAL AB( LDAB, * ), AFB( LDAFB, * ), WORK( * ), C( * )
PURPOSE
SLA_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 = -1op2(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 real workspace of size 5*N.
IWORK integer workspace of size N.
LAPACK routine (version 3.2) November 2008 SLA_GBRCOND(1)