The OpenNET Project / Index page

[ новости /+++ | форум | теги | ]

Интерактивная система просмотра системных руководств (man-ов)

 ТемаНаборКатегория 
 
 [Cписок руководств | Печать]

zlaqsy (3)
  • >> zlaqsy (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         zlaqsy - equilibrate a symmetric matrix A using the  scaling
         factors in the vector S
    
    SYNOPSIS
         SUBROUTINE ZLAQSY( UPLO, N, A, LDA, S, SCOND, AMAX, EQUED )
    
         CHARACTER EQUED, UPLO
    
         INTEGER LDA, N
    
         DOUBLE PRECISION AMAX, SCOND
    
         DOUBLE PRECISION S( * )
    
         COMPLEX*16 A( LDA, * )
    
    
    
         #include <sunperf.h>
    
         void zlaqsy(char uplo, int n, doublecomplex  *za,  int  lda,
                   double   *s,   double  scond,  double  amax,  char
                   *equed);
    
    PURPOSE
         ZLAQSY equilibrates a symmetric matrix A using  the  scaling
         factors in the vector S.
    
    
    ARGUMENTS
         UPLO      (input) CHARACTER*1
                   Specifies whether the upper  or  lower  triangular
                   part  of the symmetric matrix A is stored.  = 'U':
                   Upper triangular
                   = 'L':  Lower triangular
    
         N         (input) INTEGER
                   The order of the matrix A.  N >= 0.
    
         A         (input/output) COMPLEX*16 array, dimension (LDA,N)
                   On entry, the symmetric matrix A.  If UPLO =  'U',
                   the leading n by n upper triangular part of A con-
                   tains 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 tri-
                   angular 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       (input) INTEGER
                   The leading dimension of  the  array  A.   LDA  >=
                   max(N,1).
    
         S         (input) DOUBLE PRECISION array, dimension (N)
                   The scale factors for A.
    
         SCOND     (input) DOUBLE PRECISION
                   Ratio of the smallest S(i) to the largest S(i).
    
         AMAX      (input) DOUBLE PRECISION
                   Absolute value of largest matrix entry.
    
         EQUED     (output) 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).
    
    PARAMETERS
         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 scal-
         ing should be done based on the absolute size of the largest
         matrix element.  If AMAX > LARGE or AMAX < SMALL, scaling is
         done.
    
    
    
    


    Поиск по тексту MAN-ов: 




    Партнёры:
    PostgresPro
    Inferno Solutions
    Hosting by Hoster.ru
    Хостинг:

    Закладки на сайте
    Проследить за страницей
    Created 1996-2024 by Maxim Chirkov
    Добавить, Поддержать, Вебмастеру