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

double

multiplicator Public read/write access to avoid frequent object construction.

Method Summary

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.