Full Discussion: h e l p
h e l p Post 302359879 by فارس الأحزان on Wednesday 7th of October 2009 03:41:06 PM
Hehehehe
I want to open the formula pls
 فارس الأحزان View Public Profile for فارس الأحزان Find all posts by فارس الأحزان
```cla_lin_berr.f(3)						      LAPACK							 cla_lin_berr.f(3)

NAME
cla_lin_berr.f -

SYNOPSIS
Functions/Subroutines
subroutine cla_lin_berr (N, NZ, NRHS, RES, AYB, BERR)
CLA_LIN_BERR

Function/Subroutine Documentation
subroutine cla_lin_berr (integerN, integerNZ, integerNRHS, complex, dimension( n, nrhs )RES, real, dimension( n, nrhs )AYB, real, dimension(
nrhs )BERR)
CLA_LIN_BERR

Purpose:

CLA_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.

Parameters:
N

N is INTEGER
The number of linear equations, i.e., the order of the
matrix A.  N >= 0.

NZ

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

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

RES is DOUBLE PRECISION array, dimension (N,NRHS)
The residual matrix, i.e., the matrix R in the relative backward
error formula above.

AYB

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 cla_gerfsx_extended.f).

BERR

BERR is COMPLEX array, dimension (NRHS)
The componentwise relative backward error from the formula above.

Author:
Univ. of Tennessee

Univ. of California Berkeley

NAG Ltd.

Date:
November 2011

Definition at line 102 of file cla_lin_berr.f.

Author
Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.1							  Sun May 26 2013						 cla_lin_berr.f(3)```

## Featured Tech Videos

All times are GMT -4. The time now is 11:25 PM.