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CentOS 7.0 - man page for dlaqsp (centos section 3)

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dlaqsp.f(3)				      LAPACK				      dlaqsp.f(3)

NAME
       dlaqsp.f -

SYNOPSIS
   Functions/Subroutines
       subroutine dlaqsp (UPLO, N, AP, S, SCOND, AMAX, EQUED)
	   DLAQSP scales a symmetric/Hermitian matrix in packed storage, using scaling factors
	   computed by sppequ.

Function/Subroutine Documentation
   subroutine dlaqsp (characterUPLO, integerN, double precision, dimension( * )AP, double
       precision, dimension( * )S, double precisionSCOND, double precisionAMAX, characterEQUED)
       DLAQSP scales a symmetric/Hermitian matrix in packed storage, using scaling factors
       computed by sppequ.

       Purpose:

	    DLAQSP equilibrates a symmetric matrix A using the scaling factors
	    in the vector S.

       Parameters:
	   UPLO

		     UPLO is CHARACTER*1
		     Specifies whether the upper or lower triangular part of the
		     symmetric matrix A is stored.
		     = 'U':  Upper triangular
		     = 'L':  Lower triangular

	   N

		     N is INTEGER
		     The order of the matrix A.  N >= 0.

	   AP

		     AP is 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

		     S is DOUBLE PRECISION array, dimension (N)
		     The scale factors for A.

	   SCOND

		     SCOND is DOUBLE PRECISION
		     Ratio of the smallest S(i) to the largest S(i).

	   AMAX

		     AMAX is DOUBLE PRECISION
		     Absolute value of largest matrix entry.

	   EQUED

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		     = 'Y':  Equilibration was done, i.e., A has been replaced by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

       Internal 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.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   September 2012

       Definition at line 126 of file dlaqsp.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2				 Tue Sep 25 2012			      dlaqsp.f(3)


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