dlaqge.f(3) LAPACK dlaqge.f(3)
subroutine dlaqge (M, N, A, LDA, R, C, ROWCND, COLCND, AMAX, EQUED)
DLAQGE scales a general rectangular matrix, using row and column scaling factors
computed by sgeequ.
subroutine dlaqge (integerM, integerN, double precision, dimension( lda, * )A, integerLDA,
double precision, dimension( * )R, double precision, dimension( * )C, double
precisionROWCND, double precisionCOLCND, double precisionAMAX, characterEQUED)
DLAQGE scales a general rectangular matrix, using row and column scaling factors computed
DLAQGE equilibrates a general M by N matrix A using the row and
column scaling factors in the vectors R and C.
M is INTEGER
The number of rows of the matrix A. M >= 0.
N is INTEGER
The number of columns of the matrix A. N >= 0.
A is DOUBLE PRECISION array, dimension (LDA,N)
On entry, the M by N matrix A.
On exit, the equilibrated matrix. See EQUED for the form of
the equilibrated matrix.
LDA is INTEGER
The leading dimension of the array A. LDA >= max(M,1).
R is DOUBLE PRECISION array, dimension (M)
The row scale factors for A.
C is DOUBLE PRECISION array, dimension (N)
The column scale factors for A.
ROWCND is DOUBLE PRECISION
Ratio of the smallest R(i) to the largest R(i).
COLCND is DOUBLE PRECISION
Ratio of the smallest C(i) to the largest C(i).
AMAX is DOUBLE PRECISION
Absolute value of largest matrix entry.
EQUED is CHARACTER*1
Specifies the form of equilibration that was done.
= 'N': No equilibration
= 'R': Row equilibration, i.e., A has been premultiplied by
= 'C': Column equilibration, i.e., A has been postmultiplied
= 'B': Both row and column equilibration, i.e., A has been
replaced by diag(R) * A * diag(C).
THRESH is a threshold value used to decide if row or column scaling
should be done based on the ratio of the row or column scaling
factors. If ROWCND < THRESH, row scaling is done, and if
COLCND < THRESH, column scaling is done.
LARGE and SMALL are threshold values used to decide if row scaling
should be done based on the absolute size of the largest matrix
element. If AMAX > LARGE or AMAX < SMALL, row scaling is done.
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
Definition at line 142 of file dlaqge.f.
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.2 Tue Sep 25 2012 dlaqge.f(3)