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

NAME

6       SLA_GERCOND  - 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_GERCOND ( TRANS, N, A, LDA, AF, LDAF, IPIV, CMODE, C,
15                     INFO, WORK, IWORK )
16
17           IMPLICIT  NONE
18
19           CHARACTER TRANS
20
21           INTEGER   N, LDA, LDAF, INFO, CMODE
22
23           INTEGER   IPIV( * ), IWORK( * )
24
25           REAL      A( LDA, * ), AF( LDAF, * ), 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 3*N.
40
41       IWORK    INTEGER workspace of size N.
42
43
44
45    LAPACK routine (version 3.2) November 2008                  SLA_GERCOND(1)
Impressum