edu.jas.root

Class RootUtil

java.lang.Object

edu.jas.root.RootUtil

public class RootUtil
extends java.lang.Object

Real root utilities. For example real root count.

Constructor Summary

Constructors

Constructor and Description
RootUtil()

Method Summary

Modifier and Type	Method and Description
static <C extends RingElem<C> & Rational> Interval<C>	parseInterval(RingFactory<C> fac, java.lang.String s) Parse interval for a real root from String.
static <C extends RingElem<C> & Rational> Rectangle<C>	parseRectangle(RingFactory<Complex<C>> fac, java.lang.String s) Parse rectangle for a complex root from String.
static <C extends RingElem<C>> long	signVar(java.util.List<C> L) Count changes in sign.

Methods inherited from class java.lang.Object

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

Constructor Detail

RootUtil

public RootUtil()

Method Detail

signVar

public static <C extends RingElem<C>> long signVar(java.util.List<C> L)

Count changes in sign.

Type Parameters:

C - coefficient type.

Parameters:

L - list of coefficients.

Returns:

number of sign changes in L.

parseInterval

public static <C extends RingElem<C> & Rational> Interval<C> parseInterval(RingFactory<C> fac,
                                                                           java.lang.String s)

Parse interval for a real root from String.

Parameters:

s - String, syntax: [left, right] or [mid].

Returns:

Interval from s.

parseRectangle

public static <C extends RingElem<C> & Rational> Rectangle<C> parseRectangle(RingFactory<Complex<C>> fac,
                                                                             java.lang.String s)

Parse rectangle for a complex root from String.

Parameters:

s - String, syntax: [south-west, north-east] or [mid].

Returns:

Interval from s.