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claqge (3)
  • >> claqge (3) ( Solaris man: Библиотечные вызовы )
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    NAME
         claqge - equilibrate a general M by N matrix A using the row
         and scaling factors in the vectors R and C
    
    SYNOPSIS
         SUBROUTINE CLAQGE( M, N, A, LDA, R, C, ROWCND, COLCND, AMAX,
                   EQUED )
    
         CHARACTER EQUED
    
         INTEGER LDA, M, N
    
         REAL AMAX, COLCND, ROWCND
    
         REAL C( * ), R( * )
    
         COMPLEX A( LDA, * )
    
    
    
         #include <sunperf.h>
    
         void claqge(int m, int n, complex *ca, int  lda,  float  *r,
                   float *sc, float rowcnd, float colcnd, float amax,
                   char *equed) ;
    
    PURPOSE
         CLAQGE equilibrates a general M by N matrix A using the  row
         and scaling factors in the vectors R and C.
    
    
    ARGUMENTS
         M         (input) INTEGER
                   The number of rows of the matrix A.  M >= 0.
    
         N         (input) INTEGER
                   The number of columns of the matrix A.  N >= 0.
    
         A         (input/output) COMPLEX 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       (input) INTEGER
                   The leading dimension of  the  array  A.   LDA  >=
                   max(M,1).
    
         R         (input) REAL array, dimension (M)
                   The row scale factors for A.
    
         C         (input) REAL array, dimension (N)
                   The column scale factors for A.
    
         ROWCND    (input) REAL
                   Ratio of the smallest R(i) to the largest R(i).
    
         COLCND    (input) REAL
                   Ratio of the smallest C(i) to the largest C(i).
    
         AMAX      (input) REAL
                   Absolute value of largest matrix entry.
    
         EQUED     (output) 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 equili-
                   bration,  i.e.,  A  has  been  postmultiplied   by
                   diag(C).   =  'B':  Both row and column equilibra-
                   tion, i.e., A has been replaced by diag(R) *  A  *
                   diag(C).
    
    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.
    
    
    
    


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