dla_gercond(l) - Linux man page

Name

DLA_GERCOND - DLA_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

Synopsis

DOUBLE PRECISION

FUNCTION DLA_GERCOND ( TRANS, N, A, LDA, AF, LDAF, IPIV, CMODE, C, INFO, WORK, IWORK )

IMPLICIT

NONE

CHARACTER

TRANS

INTEGER

N, LDA, LDAF, INFO, CMODE

INTEGER

IPIV( * ), IWORK( * )

DOUBLE

PRECISION A( LDA, * ), AF( LDAF, * ), WORK( * ), C( * )

Purpose

DLA_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 DOUBLE PRECISION workspace of size 3*N, and

IWORK INTEGER workspace of size N.