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LAPACK version 3.0
dlaqsp(3)

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

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

      CHARACTER	     EQUED, UPLO

      INTEGER	     N

      DOUBLE	     PRECISION AMAX, SCOND

      DOUBLE	     PRECISION AP( * ), S( * )

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	  = 'Y':  Equilibration was done, i.e., A has been replaced by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