sla_gbrcond3lapack
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 = -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
Usage
- 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 = -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 real workspace of size 5*N.
- IWORK integer workspace of size N.