👤
Home Man
Search
Today's Posts
Register

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:
Select Section of Man Page:
Select Man Page Repository:

RedHat 9 (Linux i386) - man page for zlaqhp (redhat section l)

ZLAQHP(l)					)					ZLAQHP(l)

NAME
       ZLAQHP - equilibrate a Hermitian matrix A using the scaling factors in the vector S

SYNOPSIS
       SUBROUTINE ZLAQHP( UPLO, N, AP, S, SCOND, AMAX, EQUED )

	   CHARACTER	  EQUED, UPLO

	   INTEGER	  N

	   DOUBLE	  PRECISION AMAX, SCOND

	   DOUBLE	  PRECISION S( * )

	   COMPLEX*16	  AP( * )

PURPOSE
       ZLAQHP equilibrates a Hermitian 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 Hermitian matrix A is
	       stored.	= 'U':	Upper triangular
	       = 'L':  Lower triangular

       N       (input) INTEGER
	       The order of the matrix A.  N >= 0.

       AP      (input/output) COMPLEX*16 array, dimension (N*(N+1)/2)
	       On entry, the upper or lower triangle of the Hermitian matrix A, packed columnwise
	       in  a linear array.  The j-th column of A is stored in the array AP as follows: if
	       UPLO = 'U', AP(i + (j-1)*j/2) =	A(i,j)	for  1<=i<=j;  if  UPLO  =  'L',  AP(i	+
	       (j-1)*(2n-j)/2) = A(i,j) for j<=i<=n.

	       On exit, the equilibrated matrix:  diag(S) * A * diag(S), in the same storage for-
	       mat as A.

       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	       = 'Y':  Equilibration was done, i.e., A	has  been  replaced  by  diag(S)  *  A	*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 scaling should be done based on the
       absolute  size of the largest matrix element.  If AMAX > LARGE or AMAX < SMALL, scaling is
       done.

LAPACK version 3.0			   15 June 2000 				ZLAQHP(l)


All times are GMT -4. The time now is 07:18 PM.

Unix & Linux Forums Content Copyrightę1993-2018. All Rights Reserved.
×
UNIX.COM Login
Username:
Password:  
Show Password