Package com.singularsys.extensions.djep

Class DEquationExtractor

java.lang.Object

com.singularsys.jep.walkers.DoNothingVisitor

com.singularsys.jep.walkers.DeepCopyVisitor

com.singularsys.extensions.xjep.EquationExtractor

com.singularsys.extensions.djep.DEquationExtractor

All Implemented Interfaces:

JepComponent, ParserVisitor, java.io.Serializable

public class DEquationExtractor
extends EquationExtractor

Extract equations for symbolic variables. If y is a variable which has an equation it will be replaced by its equation. Methods allow either all variables with equations to be extracted or just those which are PartialDerivative.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	DEquationExtractor.Type

Field Summary

Fields inherited from class com.singularsys.jep.walkers.DoNothingVisitor

ft, jep, nf, ot, vt

Constructor Summary

Constructors

Constructor	Description
DEquationExtractor()
DEquationExtractor(DJep j)

Method Summary

Modifier and Type	Method	Description
Node	replacePartialDerivativeByExpressions(Node node)	Replace PartialDerivative variables by their equations
Node	replaceRHSVariablesByEquations(Node node)	Replace variables on the right had side of an assignment by their equations
Node	replaceVariableByExpressions(Node node)	Replace all symbolic variable by their equations
java.lang.Object	visit(ASTVarNode node, java.lang.Object data)	Visit a variable node.
Node	visit(Node node)

Methods inherited from class com.singularsys.jep.walkers.DeepCopyVisitor

deepCopy, visit, visit, visit

Methods inherited from class com.singularsys.jep.walkers.DoNothingVisitor

childrenHaveChanged, copyChildrenIfNeeded, getFunctionTable, getLightWeightInstance, getNodeFactory, getOperatorTable, getVariableTable, init, visitChildren, visitNode

Methods inherited from class java.lang.Object

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

Constructor Detail

DEquationExtractor

public DEquationExtractor()

DEquationExtractor

public DEquationExtractor(DJep j)

Method Detail

visit

public Node visit(Node node)
           throws JepException

Overrides:

visit in class DoNothingVisitor

Throws:

JepException

replaceVariableByExpressions

public Node replaceVariableByExpressions(Node node)
                                  throws JepException

Replace all symbolic variable by their equations

Overrides:

replaceVariableByExpressions in class EquationExtractor

Parameters:

node - root of expression

Returns:

copy of node with variables replaced by their equations

Throws:

JepException

replacePartialDerivativeByExpressions

public Node replacePartialDerivativeByExpressions(Node node)
                                           throws JepException

Replace PartialDerivative variables by their equations

Parameters:

node - root of expression

Returns:

copy of node with partial derivative variables replaced by their equations

Throws:

JepException

replaceRHSVariablesByEquations

public Node replaceRHSVariablesByEquations(Node node)
                                    throws JepException

Replace variables on the right had side of an assignment by their equations

Overrides:

replaceRHSVariablesByEquations in class EquationExtractor

Parameters:

node - an equation of the form g:=f^2-1

Returns:

a copy of the node

Throws:

JepException

visit

public java.lang.Object visit(ASTVarNode node,
                              java.lang.Object data)
                       throws JepException

Description copied from class: DoNothingVisitor

Visit a variable node. Can be overridden by sub-classes.

Specified by:

visit in interface ParserVisitor

Overrides:

visit in class EquationExtractor

Throws:

JepException