centos man page for dgeequ

dgeequ.f(3)							      LAPACK							       dgeequ.f(3)

NAME
       dgeequ.f -

SYNOPSIS
   Functions/Subroutines
       subroutine dgeequ (M, N, A, LDA, R, C, ROWCND, COLCND, AMAX, INFO)
	   DGEEQU

Function/Subroutine Documentation
   subroutine dgeequ (integerM, integerN, double precision, dimension( lda, * )A, integerLDA, double precision, dimension( * )R, double precision,
       dimension( * )C, double precisionROWCND, double precisionCOLCND, double precisionAMAX, integerINFO)
       DGEEQU

       Purpose:

	    DGEEQU computes row and column scalings intended to equilibrate an
	    M-by-N matrix A and reduce its condition number.  R returns the row
	    scale factors and C the column scale factors, chosen to try to make
	    the largest element in each row and column of the matrix B with
	    elements B(i,j)=R(i)*A(i,j)*C(j) have absolute value 1.

	    R(i) and C(j) are restricted to be between SMLNUM = smallest safe
	    number and BIGNUM = largest safe number.  Use of these scaling
	    factors is not guaranteed to reduce the condition number of A but
	    works well in practice.

       Parameters:
	   M

		     M is INTEGER
		     The number of rows of the matrix A.  M >= 0.

	   N

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

	   A

		     A is DOUBLE PRECISION array, dimension (LDA,N)
		     The M-by-N matrix whose equilibration factors are
		     to be computed.

	   LDA

		     LDA is INTEGER
		     The leading dimension of the array A.  LDA >= max(1,M).

	   R

		     R is DOUBLE PRECISION array, dimension (M)
		     If INFO = 0 or INFO > M, R contains the row scale factors
		     for A.

	   C

		     C is DOUBLE PRECISION array, dimension (N)
		     If INFO = 0,  C contains the column scale factors for A.

	   ROWCND

		     ROWCND is DOUBLE PRECISION
		     If INFO = 0 or INFO > M, ROWCND contains the ratio of the
		     smallest R(i) to the largest R(i).  If ROWCND >= 0.1 and
		     AMAX is neither too large nor too small, it is not worth
		     scaling by R.

	   COLCND

		     COLCND is DOUBLE PRECISION
		     If INFO = 0, COLCND contains the ratio of the smallest
		     C(i) to the largest C(i).	If COLCND >= 0.1, it is not
		     worth scaling by C.

	   AMAX

		     AMAX is DOUBLE PRECISION
		     Absolute value of largest matrix element.	If AMAX is very
		     close to overflow or very close to underflow, the matrix
		     should be scaled.

	   INFO

		     INFO is INTEGER
		     = 0:  successful exit
		     < 0:  if INFO = -i, the i-th argument had an illegal value
		     > 0:  if INFO = i,  and i is
			   <= M:  the i-th row of A is exactly zero
			   >  M:  the (i-M)-th column of A is exactly zero

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Definition at line 139 of file dgeequ.f.

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

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