table of contents
other versions
- wheezy 3.4.1+dfsg-1+deb70u1
- jessie 3.5.0-4
- jessie-backports 3.7.0-1~bpo8+1
- testing 3.7.0-2
- unstable 3.7.0-2
sla_syrpvgrw.f(3) | LAPACK | sla_syrpvgrw.f(3) |
NAME¶
sla_syrpvgrw.f -SYNOPSIS¶
Functions/Subroutines¶
REAL function sla_syrpvgrw (UPLO, N, INFO, A, LDA, AF, LDAF, IPIV, WORK)
Function/Subroutine Documentation¶
REAL function sla_syrpvgrw (character*1UPLO, integerN, integerINFO, real, dimension( lda, * )A, integerLDA, real, dimension( ldaf, * )AF, integerLDAF, integer, dimension( * )IPIV, real, dimension( * )WORK)¶
SLA_SYRPVGRW Purpose:SLA_SYRPVGRW 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.
UPLO
N
INFO
A
LDA
AF
LDAF
IPIV
WORK
Author:
UPLO is CHARACTER*1 = 'U': Upper triangle of A is stored; = 'L': Lower triangle of A is stored.
N is INTEGER The number of linear equations, i.e., the order of the matrix A. N >= 0.
INFO is INTEGER The value of INFO returned from SSYTRF, .i.e., the pivot in column INFO is exactly 0.
A is REAL array, dimension (LDA,N) On entry, the N-by-N matrix A.
LDA is INTEGER The leading dimension of the array A. LDA >= max(1,N).
AF is REAL array, dimension (LDAF,N) The block diagonal matrix D and the multipliers used to obtain the factor U or L as computed by SSYTRF.
LDAF is INTEGER The leading dimension of the array AF. LDAF >= max(1,N).
IPIV is INTEGER array, dimension (N) Details of the interchanges and the block structure of D as determined by SSYTRF.
WORK is REAL array, dimension (2*N)
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
November 2011
Author¶
Generated automatically by Doxygen for LAPACK from the source code.Sun May 26 2013 | Version 3.4.1 |