dla_syrcond (l)  Linux Man Pages
dla_syrcond: DLA_SYRCOND 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 infinitynorm condition number
NAME
DLA_SYRCOND  DLA_SYRCOND 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 infinitynorm condition numberSYNOPSIS
 DOUBLE PRECISION
 FUNCTION DLA_SYRCOND( UPLO, N, A, LDA, AF, LDAF, IPIV, CMODE, C, INFO, WORK, IWORK )
 IMPLICIT NONE
 CHARACTER UPLO
 INTEGER N, LDA, LDAF, INFO, CMODE
 INTEGER IWORK( * ), IPIV( * )
 DOUBLE PRECISION A( LDA, * ), AF( LDAF, * ), WORK( * ), C( * )
PURPOSE
DLA_SYRCOND estimates the Skeel condition number of
where op2 is determined by CMODE as follows
CMODE
CMODE
CMODE
The Skeel condition number cond(A)
is computed by computing scaling factors R such that
diag(R)*A*op2(C)
infinitynorm condition number.
ARGUMENTS
 WORK double precision workspace of size 3*N.
 IWORK integer workspace of size N.
