org.lsmp.djep.djep
Class PartialDerivative

java.lang.Object
  java.util.Observable
      org.nfunk.jep.Variable
          org.lsmp.djep.xjep.XVariable
              org.lsmp.djep.djep.PartialDerivative

All Implemented Interfaces:

Observer

Direct Known Subclasses:

MatrixPartialDerivative

public class PartialDerivative
extends XVariable
implements Observer

Contains infomation about a PartialDerivative of a variable. Should

Author:

Rich Morris Created on 29-Oct-2003

Field Summary

Fields inherited from class org.nfunk.jep.Variable

name

Constructor Summary

protected	PartialDerivative(DVariable var, String[] derivnames) Protected constructor, should only be constructed through the findDerivative method in DVariable.
protected	PartialDerivative(DVariable var, String[] derivnames, Node deriv)

Method Summary

PartialDerivative	findDerivative(String dname, DJep jep)
String[]	getDnames()
String	getName()
DVariable	getRoot() Every partial derivative has a root variable for instance the root variable of dy/dx is y.
String	toString() Returns a string with the variable name followed by it's value.
void	update(Observable arg0, Object arg1) When the value of the root object is changed makes the value of this partial derivative invalid.

Methods inherited from class org.lsmp.djep.xjep.XVariable

calcValue, getEquation, hasEquation, setEquation, toString

Methods inherited from class org.nfunk.jep.Variable

getValue, hasValidValue, isConstant, setIsConstant, setValidValue, setValue, setValueRaw

Methods inherited from class java.util.Observable

addObserver, clearChanged, countObservers, deleteObserver, deleteObservers, hasChanged, notifyObservers, notifyObservers, setChanged

Methods inherited from class java.lang.Object

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

Constructor Detail

PartialDerivative

protected PartialDerivative(DVariable var,
                            String[] derivnames)

Protected constructor, should only be constructed through the findDerivative method in DVariable.

PartialDerivative

protected PartialDerivative(DVariable var,
                            String[] derivnames,
                            Node deriv)

Method Detail

getName

public String getName()

Overrides:

getName in class Variable

getRoot

public DVariable getRoot()

Every partial derivative has a root variable for instance the root variable of dy/dx is y. This method returns than variable.

getDnames

public String[] getDnames()

toString

public String toString()

Description copied from class: Variable

Returns a string with the variable name followed by it's value. For example for the variable "a" with the value 10, the following string is returned:

a: 10

If the variable is a constant the string " (Constant" is appended.

Overrides:

toString in class Variable

Returns:

A string with the variable name and value.

findDerivative

public PartialDerivative findDerivative(String dname,
                                        DJep jep)
                                 throws ParseException

Throws:

ParseException

update

public void update(Observable arg0,
                   Object arg1)

When the value of the root object is changed makes the value of this partial derivative invalid.

Specified by:

update in interface Observer

See Also:

Observer.update(java.util.Observable, java.lang.Object)