org.netlib.lapack
Class Dlaed6

java.lang.Object
  extended by org.netlib.lapack.Dlaed6

public class Dlaed6
extends java.lang.Object

Following is the description from the original
Fortran source.  For each array argument, the Java
version will include an integer offset parameter, so
the arguments may not match the description exactly.
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 * * Further Details * =============== * * Based on contributions by * Ren-Cang Li, Computer Science Division, University of California * at Berkeley, USA * * ===================================================================== * * .. Parameters ..


Field Summary
static double eps
           
static boolean first
           
static double small1
           
static double small2
           
static double sminv1
           
static double sminv2
           
 
Constructor Summary
Dlaed6()
           
 
Method Summary
static void dlaed6(int kniter, boolean orgati, double rho, double[] d, int _d_offset, double[] z, int _z_offset, double finit, doubleW tau, intW info)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

eps

public static double eps

small1

public static double small1

small2

public static double small2

sminv1

public static double sminv1

sminv2

public static double sminv2

first

public static boolean first
Constructor Detail

Dlaed6

public Dlaed6()
Method Detail

dlaed6

public static void dlaed6(int kniter,
                          boolean orgati,
                          double rho,
                          double[] d,
                          int _d_offset,
                          double[] z,
                          int _z_offset,
                          double finit,
                          doubleW tau,
                          intW info)