![]() |
LAPACK
3.7.0
LAPACK: Linear Algebra PACKage
|
real function sla_gerpvgrw | ( | integer | N, |
integer | NCOLS, | ||
real, dimension( lda, * ) | A, | ||
integer | LDA, | ||
real, dimension( ldaf, * ) | AF, | ||
integer | LDAF | ||
) |
SLA_GERPVGRW
Download SLA_GERPVGRW + dependencies [TGZ] [ZIP] [TXT]
SLA_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.
[in] | N | N is INTEGER The number of linear equations, i.e., the order of the matrix A. N >= 0. |
[in] | NCOLS | NCOLS is INTEGER The number of columns of the matrix A. NCOLS >= 0. |
[in] | A | A is REAL array, dimension (LDA,N) On entry, the N-by-N matrix A. |
[in] | LDA | LDA is INTEGER The leading dimension of the array A. LDA >= max(1,N). |
[in] | AF | AF is REAL array, dimension (LDAF,N) The factors L and U from the factorization A = P*L*U as computed by SGETRF. |
[in] | LDAF | LDAF is INTEGER The leading dimension of the array AF. LDAF >= max(1,N). |
Definition at line 99 of file sla_gerpvgrw.f.