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Class org.netlib.lapack.DLAED6

java.lang.Object
   |
   +----org.netlib.lapack.DLAED6

public class DLAED6

extends Object

DLAED6 is a simplified interface to the JLAPACK routine dlaed6.
This interface converts Java-style 2D row-major arrays into
the 1D column-major linearized arrays expected by the lower
level JLAPACK routines.  Using this interface also allows you
to omit offset and leading dimension arguments.  However, because
of these conversions, these routines will be slower than the low
level ones.  Following is the description from the original Fortran
source.  Contact seymour@cs.utk.edu with any questions.

 *     ..
 *
 *  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
 *
 *  It is assumed that
 *
 *        if ORGATI = .true. the root is between d(2) and d(3);
 *        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
 *
 *  =====================================================================
 *
 *     .. Parameters ..

DLAED6()

DLAED6(int, boolean, double, double[], double[], double, doubleW, intW)

 public DLAED6()

 public static void DLAED6(int kniter,
                           boolean orgati,
                           double rho,
                           double d[],
                           double z[],
                           double finit,
                           doubleW tau,
                           intW info)

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