org.netlib.lapack
Class Slasq3

java.lang.Object
  org.netlib.lapack.Slasq3

public class Slasq3
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
 *  =======
 *
 *  SLASQ3 checks for deflation, computes a shift (TAU) and calls dqds.
 *  In case of failure it changes shifts, and tries again until output
 *  is positive.
 *
 *  Arguments
 *  =========
 *
 *  I0     (input) INTEGER
 *         First index.
 *
 *  N0     (input) INTEGER
 *         Last index.
 *
 *  Z      (input) REAL array, dimension ( 4*N )
 *         Z holds the qd array.
 *
 *  PP     (input) INTEGER
 *         PP=0 for ping, PP=1 for pong.
 *
 *  DMIN   (output) REAL
 *         Minimum value of d.
 *
 *  SIGMA  (output) REAL
 *         Sum of shifts used in current segment.
 *
 *  DESIG  (input/output) REAL
 *         Lower order part of SIGMA
 *
 *  QMAX   (input) REAL
 *         Maximum value of q.
 *
 *  NFAIL  (output) INTEGER
 *         Number of times shift was too big.
 *
 *  ITER   (output) INTEGER
 *         Number of iterations.
 *
 *  NDIV   (output) INTEGER
 *         Number of divisions.
 *
 *  TTYPE  (output) INTEGER
 *         Shift type.
 *
 *  IEEE   (input) LOGICAL
 *         Flag for IEEE or non IEEE arithmetic (passed to SLASQ5).
 *
 *  =====================================================================
 *
 *     .. Parameters ..

Field Summary

static floatW	dmin1
static floatW	dmin2
static floatW	dn
static floatW	dn1
static floatW	dn2
static floatW	tau
static intW	ttype

Constructor Summary

Slasq3()

Method Summary

static void

slasq3(int i0, intW n0, float[] z, int _z_offset, int pp, floatW dmin, floatW sigma, floatW desig, floatW qmax, intW nfail, intW iter, intW ndiv, boolean ieee)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ttype

public static intW ttype

tau

public static floatW tau

dn2

public static floatW dn2

dn1

public static floatW dn1

dn

public static floatW dn

dmin2

public static floatW dmin2

dmin1

public static floatW dmin1

Constructor Detail

Slasq3

public Slasq3()

Method Detail

slasq3

public static void slasq3(int i0,
                          intW n0,
                          float[] z,
                          int _z_offset,
                          int pp,
                          floatW dmin,
                          floatW sigma,
                          floatW desig,
                          floatW qmax,
                          intW nfail,
                          intW iter,
                          intW ndiv,
                          boolean ieee)