de.congrace.exp4j

Class CustomFunction

java.lang.Object

de.congrace.exp4j.CustomFunction

Direct Known Subclasses:

BultinFunction

public abstract class CustomFunction
extends java.lang.Object

this classed is used to create custom functions for exp4j

Example

        
 CustomFunction fooFunc = new CustomFunction("foo") {
                public double applyFunction(double value) {
                        return value*Math.E;
                }
 };
 double varX=12d;
 Calculable calc = new ExpressionBuilder("foo(x)").withCustomFunction(fooFunc).withVariable("x",varX).build();
 assertTrue(calc.calculate() == Math.E * varX);
 }

Author:

frank asseg

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	CustomFunction(java.lang.String name) create a new single value input CustomFunction with a set name
protected	CustomFunction(java.lang.String name, int argumentCount) create a new single value input CustomFunction with a set name

Method Summary

Methods

Modifier and Type	Method and Description
abstract double	applyFunction(double... args)
boolean	equals(java.lang.Object obj)
int	hashCode()

Methods inherited from class java.lang.Object

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

Constructor Detail

CustomFunction

protected CustomFunction(java.lang.String name)
                  throws InvalidCustomFunctionException

create a new single value input CustomFunction with a set name

Parameters:

value - the name of the function (e.g. foo)

Throws:

InvalidCustomFunctionException

CustomFunction

protected CustomFunction(java.lang.String name,
              int argumentCount)
                  throws InvalidCustomFunctionException

create a new single value input CustomFunction with a set name

Parameters:

value - the name of the function (e.g. foo)

Throws:

InvalidCustomFunctionException

Method Detail

applyFunction

public abstract double applyFunction(double... args)

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object