| SRC/sla_gerpvgrw.f(3) | Library Functions Manual | SRC/sla_gerpvgrw.f(3) |
NAME
SRC/sla_gerpvgrw.f
SYNOPSIS
Functions/Subroutines
real function sla_gerpvgrw (n, ncols, a, lda, af, ldaf)
SLA_GERPVGRW
Function/Subroutine Documentation
real function sla_gerpvgrw (integer n, integer ncols, real, dimension( lda, * ) a, integer lda, real, dimension( ldaf, * ) af, integer ldaf)
SLA_GERPVGRW
Purpose:
!> !> SLA_GERPVGRW computes the reciprocal pivot growth factor !> norm(A)/norm(U). The 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 REAL 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 REAL array, dimension (LDAF,N) !> The factors L and U from the factorization !> A = P*L*U as computed by SGETRF. !>
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.
Definition at line 96 of file sla_gerpvgrw.f.
Author
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