Package com.singularsys.extensions.djep.diffRules

Class ZeroDiffRule

java.lang.Object

com.singularsys.extensions.djep.diffRules.ZeroDiffRule

All Implemented Interfaces:

DiffRulesI, JepComponent, Serializable

public class ZeroDiffRule
extends Object
implements DiffRulesI

Rules like diff(x > y,x) -> 0 where the derivative should be zero.

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
ZeroDiffRule(DJep djep, Operator op)
ZeroDiffRule(DJep djep, String inName)
ZeroDiffRule(DJep djep, String inName, PostfixMathCommandI inPfmc)

Method Summary

Modifier and Type	Method	Description
Node	differentiate(ASTFunNode node, String var, Node[] children, Node[] dchildren)	Returns the top node of the derivative of this function wrt to variable var.
JepComponent	getLightWeightInstance()	Gets a light-weight instance suitable for using in multiple threads.
String	getName()	Returns the name of the function.
void	init(Jep jep)	Initialize the component.
String	toString()	Returns a string representation of the rule.

Methods inherited from class java.lang.Object

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

Constructor Details

ZeroDiffRule

public ZeroDiffRule(DJep djep,
 String inName)

ZeroDiffRule

public ZeroDiffRule(DJep djep,
 String inName,
 PostfixMathCommandI inPfmc)

ZeroDiffRule

public ZeroDiffRule(DJep djep,
 Operator op)

Method Details

init

public void init(Jep jep)

Description copied from interface: JepComponent

Initialize the component. This method is called whenever a component is added to Jep. Hence, it allows components to keep track of the other components they may rely on.

Specified by:

init in interface JepComponent

Parameters:

jep - the current Jep instance

getLightWeightInstance

public JepComponent getLightWeightInstance()

Description copied from interface: JepComponent

Gets a light-weight instance suitable for using in multiple threads.

Specified by:

getLightWeightInstance in interface JepComponent

Returns:

either a new instance, null or 'this'.

toString

public String toString()

Description copied from interface: DiffRulesI

Returns a string representation of the rule.

Specified by:

toString in interface DiffRulesI

Overrides:

toString in class Object

getName

public String getName()

Description copied from interface: DiffRulesI

Returns the name of the function. Used as index in hashtable and as way of linking with standard Jep functions. You probably want to specify the in the constructors.

Specified by:

getName in interface DiffRulesI

differentiate

public Node differentiate(ASTFunNode node,
 String var,
 Node[] children,
 Node[] dchildren)
                   throws ParseException

Description copied from interface: DiffRulesI

Returns the top node of the derivative of this function wrt to variable var.

Specified by:

differentiate in interface DiffRulesI

Parameters:

var - The name of variable to differentiate wrt to.

children - the arguments of the function

dchildren - the derivatives of each argument of the function.

Returns:

top node of and expression tree for the derivative.

Throws:

ParseException - if there is some problem in compiling the derivative.