claqge man page on IRIX

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CLAQGE(3F)							    CLAQGE(3F)

NAME
     CLAQGE - equilibrate a general M by N matrix A using the row and scaling
     factors in the vectors R and C

SYNOPSIS
     SUBROUTINE CLAQGE( M, N, A, LDA, R, C, ROWCND, COLCND, AMAX, EQUED )

	 CHARACTER	EQUED

	 INTEGER	LDA, M, N

	 REAL		AMAX, COLCND, ROWCND

	 REAL		C( * ), R( * )

	 COMPLEX	A( LDA, * )

PURPOSE
     CLAQGE equilibrates a general M by N matrix A using the row and scaling
     factors in the vectors R and C.

ARGUMENTS
     M	     (input) INTEGER
	     The number of rows of the matrix A.  M >= 0.

     N	     (input) INTEGER
	     The number of columns of the matrix A.  N >= 0.

     A	     (input/output) COMPLEX array, dimension (LDA,N)
	     On entry, the M by N matrix A.  On exit, the equilibrated matrix.
	     See EQUED for the form of the equilibrated matrix.

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

     R	     (input) REAL array, dimension (M)
	     The row scale factors for A.

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

     ROWCND  (input) REAL
	     Ratio of the smallest R(i) to the largest R(i).

     COLCND  (input) REAL
	     Ratio of the smallest C(i) to the largest C(i).

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

									Page 1

CLAQGE(3F)							    CLAQGE(3F)

     EQUED   (output) CHARACTER*1
	     Specifies the form of equilibration that was done.	 = 'N':	 No
	     equilibration
	     = 'R':  Row equilibration, i.e., A has been premultiplied by
	     diag(R).  = 'C':  Column equilibration, i.e., A has been
	     postmultiplied by diag(C).	 = 'B':	 Both row and column
	     equilibration, i.e., A has been replaced by diag(R) * A *
	     diag(C).

PARAMETERS
     THRESH is a threshold value used to decide if row or column scaling
     should be done based on the ratio of the row or column scaling factors.
     If ROWCND < THRESH, row scaling is done, and if COLCND < THRESH, column
     scaling is done.

     LARGE and SMALL are threshold values used to decide if row scaling should
     be done based on the absolute size of the largest matrix element.	If
     AMAX > LARGE or AMAX < SMALL, row scaling is done.

									Page 2

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