dla_gercond (l)  Linux Man Pages
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 infinitynorm condition number
Command to display dla_gercond
manual in Linux: $ man l dla_gercond
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 infinitynorm 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
infinitynorm condition number.
ARGUMENTS
 WORK DOUBLE PRECISION workspace of size 3*N, and

 IWORK INTEGER workspace of size N.

Pages related to dla_gercond
 dla_gercond (3)
 dla_gerfsx_extended (l)  computes ..
 dla_geamv (l)  performs one of the matrixvector operations y := alpha*abs(A)*abs(x) + beta*abs(y),
 dla_gbamv (l)  performs one of the matrixvector operations y := alpha*abs(A)*abs(x) + beta*abs(y),
 dla_gbrcond (l)  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 infinitynorm condition number
 dla_gbrfsx_extended (l)  computes ..
 dla_lin_berr (l)  DLA_LIN_BERR compute componentwise relative backward error from the formula max(i) ( abs(R(i)) / ( abs(op(A_s))*abs(Y) + abs(B_s) )(i) ) where abs(Z) is the componentwise absolute value of the matrix or vector Z
 dla_porcond (l)  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 infinitynorm condition number