dla_gerpvgrw.f (3) Linux Manual Page

dla_gerpvgrw.f –

Synopsis

Functions/Subroutines

DOUBLE PRECISION function dla_gerpvgrw (N, NCOLS, A, LDA, AF, LDAF)
DLA_GERPVGRW

Function/Subroutine Documentation

DOUBLE PRECISION function dla_gerpvgrw (integerN, integerNCOLS, double precision, dimension( lda, * )A, integerLDA, double precision, dimension( ldaf, * )AF, integerLDAF)

DLA_GERPVGRW

Purpose:

 DLA_GERPVGRW computes the reciprocal pivot growth factor

 norm(A)/norm(U). The "max absolute element" norm is used. If this is

 much less than 1, the stability of the LU factorization of the

 (equilibrated) matrix A could be poor. This also means that the

 solution X, estimated condition numbers, and error bounds could be

 unreliable.

 

Parameters:

N

 N is INTEGER

 The number of linear equations, i.e., the order of the

 matrix A. N >= 0.

NCOLS

 NCOLS is INTEGER

 The number of columns of the matrix A. NCOLS >= 0.

A

 A is DOUBLE PRECISION array, dimension (LDA,N)

 On entry, the N-by-N matrix A.

LDA

 LDA is INTEGER

 The leading dimension of the array A. LDA >= max(1,N).

AF

 AF is DOUBLE PRECISION array, dimension (LDAF,N)

 The factors L and U from the factorization

 A = P*L*U as computed by DGETRF.

LDAF

 LDAF is INTEGER

 The leading dimension of the array AF. LDAF >= max(1,N).

 

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

November 2011

Definition at line 100 of file dla_gerpvgrw.f.

Author

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