cern.jet.math

Class PlusMult

java.lang.Object

cern.jet.math.PlusMult

All Implemented Interfaces:

DoubleDoubleFunction

public final class PlusMult
extends Object
implements DoubleDoubleFunction

Only for performance tuning of compute intensive linear algebraic computations. Constructs functions that return one of

• a + b*constant
• a - b*constant
• a + b/constant
• a - b/constant

a and b are variables, constant is fixed, but for performance reasons publicly accessible. Intended to be passed to matrix.assign(otherMatrix,function) methods.

Field Summary

Fields

Modifier and Type	Field and Description
double	multiplicator Public read/write access to avoid frequent object construction.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	PlusMult(double multiplicator) Insert the method's description here.

Method Summary

Methods

Modifier and Type	Method and Description
double	apply(double a, double b) Returns the result of the function evaluation.
static PlusMult	minusDiv(double constant) a - b/constant.
static PlusMult	minusMult(double constant) a - b*constant.
static PlusMult	plusDiv(double constant) a + b/constant.
static PlusMult	plusMult(double constant) a + b*constant.

Methods inherited from class java.lang.Object

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

Field Detail

multiplicator

public double multiplicator

Public read/write access to avoid frequent object construction.

Constructor Detail

PlusMult

protected PlusMult(double multiplicator)

Insert the method's description here. Creation date: (8/10/99 19:12:09)

Method Detail

apply

public final double apply(double a,
           double b)

Returns the result of the function evaluation.

Specified by:

apply in interface DoubleDoubleFunction

Parameters:

a - the first argument passed to the function.

b - the second argument passed to the function.

Returns:

the result of the function.

minusDiv

public static PlusMult minusDiv(double constant)

a - b/constant.

minusMult

public static PlusMult minusMult(double constant)

a - b*constant.

plusDiv

public static PlusMult plusDiv(double constant)

a + b/constant.

plusMult

public static PlusMult plusMult(double constant)

a + b*constant.