1SLA_GBRCOND(L1A)PACK routine (version 3.2)                         SLA_GBRCOND(1)
2
3
4

NAME

6       SLA_GBRCOND  - SLA_GERCOND Estimate the Skeel condition number of op(A)
7       * op2(C)  where op2 is determined by CMODE as follows  CMODE = 1 op2(C)
8       = C  CMODE = 0 op2(C) = I  CMODE = -1 op2(C) = inv(C)  The Skeel condi‐
9       tion number cond(A) = norminf( |inv(A)||A| )  is computed by  computing
10       scaling  factors  R such that  diag(R)*A*op2(C) is row equilibrated and
11       computing the standard  infinity-norm condition number
12

SYNOPSIS

14       REAL FUNCTION SLA_GBRCOND( TRANS, N, KL,  KU,  AB,  LDAB,  AFB,  LDAFB,
15                     IPIV, CMODE, C, INFO, WORK, IWORK )
16
17           IMPLICIT  NONE
18
19           CHARACTER TRANS
20
21           INTEGER   N, LDAB, LDAFB, INFO, KL, KU, CMODE
22
23           INTEGER   IWORK( * ), IPIV( * )
24
25           REAL      AB( LDAB, * ), AFB( LDAFB, * ), WORK( * ), C( * )
26

PURPOSE

28          SLA_GERCOND Estimates the Skeel condition number of  op(A) * op2(C)
29          where op2 is determined by CMODE as follows
30          CMODE =  1    op2(C) = C
31          CMODE =  0    op2(C) = I
32          CMODE = -1    op2(C) = inv(C)
33          The Skeel condition number  cond(A) = norminf( |inv(A)||A| )
34          is computed by computing scaling factors R such that
35          diag(R)*A*op2(C) is row equilibrated and computing the standard
36          infinity-norm condition number.
37

ARGUMENTS

39       WORK     real workspace of size 5*N.
40
41       IWORK    integer workspace of size N.
42
43
44
45    LAPACK routine (version 3.2) November 2008                  SLA_GBRCOND(1)
Impressum