Package com.singularsys.extensions.djep

Class DEquationExtractor

java.lang.Object

com.singularsys.jep.walkers.GenericDoNothingVisitor<DEquationExtractor.Type>

com.singularsys.jep.walkers.GenericDeepCopyVisitor<DEquationExtractor.Type>

com.singularsys.extensions.xjep.EquationExtractor<DEquationExtractor.Type>

com.singularsys.extensions.djep.DEquationExtractor

All Implemented Interfaces:

GenericVisitor<Node,DEquationExtractor.Type,ParseException>, JepComponent, Serializable

public class DEquationExtractor
extends EquationExtractor<DEquationExtractor.Type>

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.

Since Jep 4.1, extensions 2.2 the parent class is a generic class and method signatures are more specific.

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	DEquationExtractor.Type	Type of variable to replace by their equations

Field Summary

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

ft, nf, ot

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
Node	visit(ASTVarNode node, DEquationExtractor.Type data)	Visit a variable node
Node	visit(Node node)

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

getLightWeightInstance, visit, visit, visit, visit

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

childrenHaveChanged, copyChildrenIfNeeded, copyChildrenIfNeeded, init, makeException

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.singularsys.jep.GenericVisitor

makeException, visitChildren

Constructor Details

DEquationExtractor

public DEquationExtractor()

DEquationExtractor

public DEquationExtractor(DJep j)

Method Details

visit

public Node visit(Node node)
           throws ParseException

Overrides:

visit in class EquationExtractor<DEquationExtractor.Type>

Throws:

ParseException

replaceVariableByExpressions

public Node replaceVariableByExpressions(Node node)
                                  throws ParseException

Replace all symbolic variable by their equations

Overrides:

replaceVariableByExpressions in class EquationExtractor<DEquationExtractor.Type>

Parameters:

node - root of expression

Returns:

copy of node with variables replaced by their equations

Throws:

ParseException

replacePartialDerivativeByExpressions

public Node replacePartialDerivativeByExpressions(Node node)
                                           throws ParseException

Replace PartialDerivative variables by their equations

Parameters:

node - root of expression

Returns:

copy of node with partial derivative variables replaced by their equations

Throws:

ParseException

replaceRHSVariablesByEquations

public Node replaceRHSVariablesByEquations(Node node)
                                    throws ParseException

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

Overrides:

replaceRHSVariablesByEquations in class EquationExtractor<DEquationExtractor.Type>

Parameters:

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

Returns:

a copy of the node

Throws:

ParseException - on error

visit

public Node visit(ASTVarNode node,
 DEquationExtractor.Type data)
           throws ParseException

Description copied from interface: GenericVisitor

Visit a variable node

Specified by:

visit in interface GenericVisitor<Node,DEquationExtractor.Type,ParseException>

Overrides:

visit in class EquationExtractor<DEquationExtractor.Type>

Parameters:

node - current node

data - context data

Returns:

the result of visiting the node

Throws:

ParseException