org.netlib.lapack
Class Dlasq3

java.lang.Object
  extended by org.netlib.lapack.Dlasq3

public class Dlasq3
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 * ======= * * DLASQ3 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) DOUBLE PRECISION array, dimension ( 4*N ) * Z holds the qd array. * * PP (input) INTEGER * PP=0 for ping, PP=1 for pong. * * DMIN (output) DOUBLE PRECISION * Minimum value of d. * * SIGMA (output) DOUBLE PRECISION * Sum of shifts used in current segment. * * DESIG (input/output) DOUBLE PRECISION * Lower order part of SIGMA * * QMAX (input) DOUBLE PRECISION * 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 DLASQ5). * * ===================================================================== * * .. Parameters ..


Field Summary
static doubleW dmin1
           
static doubleW dmin2
           
static doubleW dn
           
static doubleW dn1
           
static doubleW dn2
           
static doubleW tau
           
static intW ttype
           
 
Constructor Summary
Dlasq3()
           
 
Method Summary
static void dlasq3(int i0, intW n0, double[] z, int _z_offset, int pp, doubleW dmin, doubleW sigma, doubleW desig, doubleW 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 doubleW tau

dn2

public static doubleW dn2

dn1

public static doubleW dn1

dn

public static doubleW dn

dmin2

public static doubleW dmin2

dmin1

public static doubleW dmin1
Constructor Detail

Dlasq3

public Dlasq3()
Method Detail

dlasq3

public static void dlasq3(int i0,
                          intW n0,
                          double[] z,
                          int _z_offset,
                          int pp,
                          doubleW dmin,
                          doubleW sigma,
                          doubleW desig,
                          doubleW qmax,
                          intW nfail,
                          intW iter,
                          intW ndiv,
                          boolean ieee)