zla_lin_berr (l) - Linux Man Pages

zla_lin_berr: ZLA_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

NAME

ZLA_LIN_BERR - ZLA_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

SYNOPSIS

SUBROUTINE ZLA_LIN_BERR
( N, NZ, NRHS, RES, AYB, BERR )

    
IMPLICIT NONE

    
INTEGER N, NZ, NRHS

    
DOUBLE PRECISION AYB( N, NRHS ), BERR( NRHS )

    
COMPLEX*16 RES( N, NRHS )

PURPOSE


ZLA_LIN_BERR computes 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.