dla_porcond(l) - Linux man page

Name

DLA_PORCOND - DLA_PORCOND 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_PORCOND( UPLO, N, A, LDA, AF, LDAF, CMODE, C, INFO, WORK, IWORK )

IMPLICIT

NONE

CHARACTER

UPLO

INTEGER

N, LDA, LDAF, INFO, CMODE

DOUBLE

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

INTEGER

IWORK( * )

Purpose

DLA_PORCOND 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.

IWORK integer workspace of size N.