1DLA_SYRCOND(L1A)PACK routine (version 3.2) DLA_SYRCOND(1)
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6 DLA_SYRCOND - DLA_SYRCOND 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 condiā
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
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14 DOUBLE PRECISION FUNCTION DLA_SYRCOND( UPLO, N, A, LDA, AF, LDAF, IPIV,
15 CMODE, C, INFO, WORK, IWORK )
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17 IMPLICIT NONE
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19 CHARACTER UPLO
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21 INTEGER N, LDA, LDAF, INFO, CMODE
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23 INTEGER IWORK( * ), IPIV( * )
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25 DOUBLE PRECISION A( LDA, * ), AF( LDAF, * ), WORK( * ), C( *
26 )
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29 DLA_SYRCOND estimates the Skeel condition number of op(A) * op2(C)
30 where op2 is determined by CMODE as follows
31 CMODE = 1 op2(C) = C
32 CMODE = 0 op2(C) = I
33 CMODE = -1 op2(C) = inv(C)
34 The Skeel condition number cond(A) = norminf( |inv(A)||A| )
35 is computed by computing scaling factors R such that
36 diag(R)*A*op2(C) is row equilibrated and computing the standard
37 infinity-norm condition number.
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40 WORK double precision workspace of size 3*N.
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42 IWORK integer workspace of size N.
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46 LAPACK routine (version 3.2) November 2008 DLA_SYRCOND(1)