dlaqsp man page on IRIX

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DLAQSP(3F)							    DLAQSP(3F)

NAME
     DLAQSP - equilibrate a symmetric matrix A using the scaling factors in
     the vector S

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

	 CHARACTER	EQUED, UPLO

	 INTEGER	N

	 DOUBLE		PRECISION AMAX, SCOND

	 DOUBLE		PRECISION AP( * ), S( * )

PURPOSE
     DLAQSP 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.

     AP	     (input/output) DOUBLE PRECISION array, dimension (N*(N+1)/2)
	     On entry, the upper or lower triangle of the symmetric 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) 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	     = 'Y':  Equilibration was done, i.e., A has been replaced by

									Page 1

DLAQSP(3F)							    DLAQSP(3F)

	     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.

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