org.opensourcephysics.numerics
Class ParsedFunction

java.lang.Object
  org.opensourcephysics.numerics.ParsedFunction

All Implemented Interfaces:

Function

public final class ParsedFunction
extends java.lang.Object
implements Function

ParsedFunction defines a function of a single varianble using a String. This function is immutable. That is, once an instance is created with a particular function string, the function cannot be changed. Because immutable objects cannot change, they are thread safe and can be freely shared in a Java program.

Author:

Wolfgang Christian

Constructor Summary

ParsedFunction(java.lang.String fStr)
Constructs a function x with from the given string.

ParsedFunction(java.lang.String _fStr, java.lang.String var)
Constructs a ParsedFunction from the given string and independent variable.

Method Summary

double	evaluate(double x) Evaluates the function, f.
java.lang.String	toString() Represents the function as a string.

Methods inherited from class java.lang.Object

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

Constructor Detail

ParsedFunction

public ParsedFunction(java.lang.String fStr)
               throws ParserException

Constructs a function x with from the given string.

Parameters:

fStr - the function

Throws:

ParserException

ParsedFunction

public ParsedFunction(java.lang.String _fStr,
                      java.lang.String var)
               throws ParserException

Constructs a ParsedFunction from the given string and independent variable.

Parameters:

_fStr - the function

var - the independent variable

Throws:

ParserException

Method Detail

evaluate

public double evaluate(double x)

Evaluates the function, f.

Specified by:

evaluate in interface Function

Parameters:

x - the value of the independent variable

Returns:

the value of the function

toString

public java.lang.String toString()

Represents the function as a string.

Overrides:

toString in class java.lang.Object

Returns:

the string