1DLA_LIN_BERRL(A1P)ACK routine (version 3.2) DLA_LIN_BERR(1)
2
3
4
6 DLA_LIN_BERR - DLA_LIN_BERR compute component-wise relative backward
7 error from the formula max(i) ( abs(R(i)) / ( abs(op(A_s))*abs(Y) +
8 abs(B_s) )(i) ) where abs(Z) is the component-wise absolute value of
9 the matrix or vector Z
10
12 SUBROUTINE DLA_LIN_BERR ( N, NZ, NRHS, RES, AYB, BERR )
13
14 IMPLICIT NONE
15
16 INTEGER N, NZ, NRHS
17
18 DOUBLE PRECISION AYB( N, NRHS ), BERR( NRHS )
19
20 DOUBLE PRECISION RES( N, NRHS )
21
23 DLA_LIN_BERR computes component-wise relative backward error from
24 the formula
25 max(i) ( abs(R(i)) / ( abs(op(A_s))*abs(Y) + abs(B_s) )(i) )
26 where abs(Z) is the component-wise absolute value of the matrix
27 or vector Z.
28
29
30
31 LAPACK routine (version 3.2) November 2008 DLA_LIN_BERR(1)