cern.jet.math.tdouble

Class DoublePlusMultFirst

java.lang.Object

cern.jet.math.tdouble.DoublePlusMultFirst

All Implemented Interfaces:

DoubleDoubleFunction

public final class DoublePlusMultFirst
extends Object
implements DoubleDoubleFunction

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

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

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.

Method Summary

Methods

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

Methods inherited from class java.lang.Object

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

Field Detail

multiplicator

public double multiplicator

Public read/write access to avoid frequent object construction.

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 DoublePlusMultFirst minusDiv(double constant)

a - b/constant.

minusMult

public static DoublePlusMultFirst minusMult(double constant)

a - b*constant.

plusDiv

public static DoublePlusMultFirst plusDiv(double constant)

a + b/constant.

plusMult

public static DoublePlusMultFirst plusMult(double constant)

a + b*constant.