org.moeaframework.util.tree
Class Sign

java.lang.Object
  org.moeaframework.util.tree.Node
      org.moeaframework.util.tree.Sign

public class Sign
extends Node

The node for calculating the sign of a number. The sign of a number is 1 if the number is greater than zero, -1 if the number is less than zero, and 0 if the number is equal to zero. The inputs and outputs to this node are shown below:

Name	Type	Description
Argument 1	Number	The number
Return Value	Number	The sign of the number

See Also:

Long.signum(long), Math.signum(double)

Constructor Summary

Sign()
Constructs a new node for calculating the sign of a number.

Method Summary

Sign	copyNode() Returns a copy of this node, but without any children or parents assigned.
Number	evaluate(Environment environment) Evaluates this node in the context of the specified environment.

Methods inherited from class org.moeaframework.util.tree.Node

copyTree, getArgument, getArgumentType, getDepth, getFunctionAt, getFunctionAt, getMaximumHeight, getMinimumHeight, getNodeAt, getNodeAt, getNodeAt, getNumberOfArguments, getNumberOfFunctions, getNumberOfFunctions, getNumberOfNodes, getNumberOfNodes, getNumberOfNodes, getNumberOfTerminals, getNumberOfTerminals, getParent, getReturnType, getTerminalAt, getTerminalAt, isFixed, isTerminal, isValid, setArgument, setFixed, setFixedTree, size, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

Sign

public Sign()

Constructs a new node for calculating the sign of a number.

Method Detail

copyNode

public Sign copyNode()

Description copied from class: Node

Returns a copy of this node, but without any children or parents assigned.

Specified by:

copyNode in class Node

Returns:

a copy of this node, but without any children or parents assigned

evaluate

public Number evaluate(Environment environment)

Description copied from class: Node

Evaluates this node in the context of the specified environment.

Specified by:

evaluate in class Node

Parameters:

environment - the execution environment

Returns:

the result of evaluating this node