Package com.graphbuilder.math

Class FuncNode

java.lang.Object

com.graphbuilder.math.Expression

com.graphbuilder.math.TermNode

com.graphbuilder.math.FuncNode

public class FuncNode
extends TermNode

A node of an expression tree that represents a function. A FuncNode can have 0 or more children.

Field Summary

Fields inherited from class com.graphbuilder.math.TermNode

name, negate

Fields inherited from class com.graphbuilder.math.Expression

parent

Constructor Summary

Constructors

Constructor	Description
FuncNode(String name, boolean negate)

Method Summary

Modifier and Type	Method	Description
void	add(Expression x)	Adds the expression as a child.
Expression	child(int i)	Returns the child expression at the specified index.
double	eval(VarMap v, FuncMap f)	Evaluates each of the children, storing the result in an internal double array.
void	insert(Expression x, int i)	Adds the expression as a child at the specified index.
int	numChildren()	Returns the number of child expressions.
void	remove(Expression x)	Removes the specified expression as a child.

Methods inherited from class com.graphbuilder.math.TermNode

getName, getNegate, setName, setNegate

Methods inherited from class com.graphbuilder.math.Expression

checkBeforeAccept, getFunctionNames, getParent, getVariableNames, isDescendent, toString

Methods inherited from class java.lang.Object

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

Constructor Details

FuncNode

public FuncNode(String name,
 boolean negate)

Method Details

add

public void add(Expression x)

Adds the expression as a child.

insert

public void insert(Expression x,
 int i)

Adds the expression as a child at the specified index.

remove

public void remove(Expression x)

Removes the specified expression as a child. Does nothing if the expression was not a child.

numChildren

public int numChildren()

Returns the number of child expressions.

child

public Expression child(int i)

Returns the child expression at the specified index.

eval

public double eval(VarMap v,
 FuncMap f)

Evaluates each of the children, storing the result in an internal double array. The FuncMap is used to obtain a Function object based on the name of this FuncNode. The function is passed the double array and returns a result. If negate is true, the result is negated. The result is then returned. The numParam passed to the function is the number of children of this FuncNode.

Specified by:

eval in class Expression