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
slaqsy.f(3) | LAPACK | slaqsy.f(3) |
NAME¶
slaqsy.f -SYNOPSIS¶
Functions/Subroutines¶
subroutine slaqsy (UPLO, N, A, LDA, S, SCOND, AMAX, EQUED)
Function/Subroutine Documentation¶
subroutine slaqsy (characterUPLO, integerN, real, dimension( lda, * )A, integerLDA, real, dimension( * )S, realSCOND, realAMAX, characterEQUED)¶
SLAQSY Purpose:SLAQSY equilibrates a symmetric matrix A using the scaling factors in the vector S.
UPLO
N
A
LDA
S
SCOND
AMAX
EQUED
Internal Parameters:
UPLO is CHARACTER*1 Specifies whether the upper or lower triangular part of the symmetric matrix A is stored. = 'U': Upper triangular = 'L': Lower triangular
N is INTEGER The order of the matrix A. N >= 0.
A is REAL array, dimension (LDA,N) On entry, the symmetric matrix A. If UPLO = 'U', the leading n by n upper triangular part of A contains the upper triangular part of the matrix A, and the strictly lower triangular part of A is not referenced. If UPLO = 'L', the leading n by n lower triangular part of A contains the lower triangular part of the matrix A, and the strictly upper triangular part of A is not referenced. On exit, if EQUED = 'Y', the equilibrated matrix: diag(S) * A * diag(S).
LDA is INTEGER The leading dimension of the array A. LDA >= max(N,1).
S is REAL array, dimension (N) The scale factors for A.
SCOND is REAL Ratio of the smallest S(i) to the largest S(i).
AMAX is REAL Absolute value of largest matrix entry.
EQUED is CHARACTER*1 Specifies whether or not equilibration was done. = 'N': No equilibration. = 'Y': Equilibration was done, i.e., A has been replaced by diag(S) * A * diag(S).
THRESH is a threshold value used to decide if scaling should be done based on the ratio of the scaling factors. If SCOND < THRESH, scaling is done. LARGE and SMALL are threshold values used to decide if scaling should be done based on the absolute size of the largest matrix element. If AMAX > LARGE or AMAX < SMALL, scaling is done.
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 |