zla_lin_berr (l) - Linux Manuals

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.

Pages related to zla_lin_berr

  • zla_lin_berr (3)
  • zla_gbamv (l) - performs one of the matrix-vector operations y := alpha*abs(A)*abs(x) + beta*abs(y),
  • zla_gbrcond_c (l) - ZLA_GBRCOND_C Compute the infinity norm condition number of op(A) * inv(diag(C)) where C is a DOUBLE PRECISION vector
  • zla_gbrcond_x (l) - ZLA_GBRCOND_X Compute the infinity norm condition number of op(A) * diag(X) where X is a COMPLEX*16 vector
  • zla_gbrfsx_extended (l) - computes ..
  • zla_geamv (l) - performs one of the matrix-vector operations y := alpha*abs(A)*abs(x) + beta*abs(y),
  • zla_gercond_c (l) - ZLA_GERCOND_C compute the infinity norm condition number of op(A) * inv(diag(C)) where C is a DOUBLE PRECISION vector
  • zla_gercond_x (l) - ZLA_GERCOND_X compute the infinity norm condition number of op(A) * diag(X) where X is a COMPLEX*16 vector