zlaqge.f - Online Linux Manual PageSection : 3
Updated : Tue Nov 14 2017
Source : Version 3.8.0
Note : LAPACK
NAMEzlaqge.f
SYNOPSIS
Functions/Subroutinessubroutine zlaqge (M, N, A, LDA, R, C, ROWCND, COLCND, AMAX, EQUED)
ZLAQGE scales a general rectangular matrix, using row and column scaling factors computed by sgeequ.
Function/Subroutine Documentation
subroutine zlaqge (integer M, integer N, complex*16, dimension( lda, * ) A, integer LDA, double precision, dimension( * ) R, double precision, dimension( * ) C, double precision ROWCND, double precision COLCND, double precision AMAX, character EQUED)ZLAQGE scales a general rectangular matrix, using row and column scaling factors computed by sgeequ. Purpose: ZLAQGE equilibrates a general M by N matrix A using the row and
column scaling factors in the vectors R and C.Parameters: M M is INTEGER
The number of rows of the matrix A. M >= 0.
N N is INTEGER
The number of columns of the matrix A. N >= 0.
A A is COMPLEX*16 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 LDA is INTEGER
The leading dimension of the array A. LDA >= max(M,1).
R R is DOUBLE PRECISION array, dimension (M)
The row scale factors for A.
C C is DOUBLE PRECISION array, dimension (N)
The column scale factors for A.
ROWCND ROWCND is DOUBLE PRECISION
Ratio of the smallest R(i) to the largest R(i).
COLCND COLCND is DOUBLE PRECISION
Ratio of the smallest C(i) to the largest C(i).
AMAX AMAX is DOUBLE PRECISION
Absolute value of largest matrix entry.
EQUED 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
diag(R).
= 'C': Column equilibration, i.e., A has been postmultiplied
by diag(C).
= 'B': Both row and column equilibration, i.e., A has been
replaced by diag(R) * A * diag(C).Internal Parameters: THRESH is a threshold value used to decide if row or column scaling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.Author: Univ. of Tennessee Univ. of California Berkeley Univ. of Colorado Denver NAG Ltd. Date: December 2016 Definition at line 145 of file zlaqge.f.
AuthorGenerated automatically by Doxygen for LAPACK from the source code. 0
Johanes Gumabo
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