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dlaed6 examples
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Man Page Details
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NAME
       DLAED6 - 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).

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

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

