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dla_lin_berr.f(3) | LAPACK | dla_lin_berr.f(3) |
NAME¶
dla_lin_berr.f -SYNOPSIS¶
Functions/Subroutines¶
subroutine dla_lin_berr (N, NZ, NRHS, RES, AYB, BERR)
Function/Subroutine Documentation¶
subroutine dla_lin_berr (integerN, integerNZ, integerNRHS, double precision, dimension( n, nrhs )RES, double precision, dimension( n, nrhs )AYB, double precision, dimension( nrhs )BERR)¶
DLA_LIN_BERR Purpose:DLA_LIN_BERR computes component-wise 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 component-wise absolute value of the matrix or vector Z.
N
NZ
NRHS
RES
AYB
BERR
Author:
N is INTEGER The number of linear equations, i.e., the order of the matrix A. N >= 0.
NZ is INTEGER We add (NZ+1)*SLAMCH( 'Safe minimum' ) to R(i) in the numerator to guard against spuriously zero residuals. Default value is N.
NRHS is INTEGER The number of right hand sides, i.e., the number of columns of the matrices AYB, RES, and BERR. NRHS >= 0.
RES is DOUBLE PRECISION array, dimension (N,NRHS) The residual matrix, i.e., the matrix R in the relative backward error formula above.
AYB is DOUBLE PRECISION array, dimension (N, NRHS) The denominator in the relative backward error formula above, i.e., the matrix abs(op(A_s))*abs(Y) + abs(B_s). The matrices A, Y, and B are from iterative refinement (see dla_gerfsx_extended.f).
BERR is DOUBLE PRECISION array, dimension (NRHS) The component-wise relative backward error from the formula above.
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
November 2011
Author¶
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