DLAED6 man page on IRIX

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DLAED6(3F)							    DLAED6(3F)

NAME
     DLAED6 - compute the positive or negative root (closest to the origin) of
     z(1) z(2) z(3) f(x) = rho + --------- + ---------- + ---------  d(1)-x
     d(2)-x d(3)-x  It is assumed that	 if ORGATI = .true

SYNOPSIS
     SUBROUTINE DLAED6( KNITER, ORGATI, RHO, D, Z, FINIT, TAU, INFO )

	 LOGICAL	ORGATI

	 INTEGER	INFO, KNITER

	 DOUBLE		PRECISION FINIT, RHO, TAU

	 DOUBLE		PRECISION D( 3 ), Z( 3 )

PURPOSE
     DLAED6 computes the positive or negative root (closest to the origin) of
		      z(1)	  z(2)	      z(3) f(x) =   rho + --------- +
     ---------- + ---------
		     d(1)-x	 d(2)-x	     d(3)-x
	   otherwise it is between d(1) and d(2)

     This routine will be called by DLAED4 when necessary. In most cases, the
     root sought is the smallest in magnitude, though it might not be in some
     extremely rare situations.

ARGUMENTS
     KNITER	  (input) INTEGER
		  Refer to DLAED4 for its significance.

     ORGATI	  (input) LOGICAL
		  If ORGATI is true, the needed root is between d(2) and d(3);
		  otherwise it is between d(1) and d(2).  See DLAED4 for
		  further details.

     RHO	  (input) DOUBLE PRECISION
		  Refer to the equation f(x) above.

     D		  (input) DOUBLE PRECISION array, dimension (3)
		  D satisfies d(1) < d(2) < d(3).

     Z		  (input) DOUBLE PRECISION array, dimension (3)
		  Each of the elements in z must be positive.

     FINIT	  (input) DOUBLE PRECISION
		  The value of f at 0. It is more accurate than the one
		  evaluated inside this routine (if someone wants to do so).

									Page 1

DLAED6(3F)							    DLAED6(3F)

     TAU	  (output) DOUBLE PRECISION
		  The root of the equation f(x).

     INFO	  (output) INTEGER
		  = 0: successful exit
		  > 0: if INFO = 1, failure to converge

									Page 2

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