CLAQHP man page on IRIX

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CLAQHP(3F)							    CLAQHP(3F)

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

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

	 CHARACTER	EQUED, UPLO

	 INTEGER	N

	 REAL		AMAX, SCOND

	 REAL		S( * )

	 COMPLEX	AP( * )

PURPOSE
     CLAQHP 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 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 format as A.

     S	     (input) REAL array, dimension (N)
	     The scale factors for A.

     SCOND   (input) REAL
	     Ratio of the smallest S(i) to the largest S(i).

     AMAX    (input) REAL
	     Absolute value of largest matrix entry.

									Page 1

CLAQHP(3F)							    CLAQHP(3F)

     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	     = 'Y':  Equilibration was done, i.e., A has been replaced by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.

									Page 2

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