Package edu.cmu.tetrad.util

Class SelectionGenerator

java.lang.Object

edu.cmu.tetrad.util.SelectionGenerator

public final class SelectionGenerator
extends Object

Generates (nonrecursively) all of the selections from a items, where a is a nonnegative integer. The values of a is given in the constructor, and the sequence of seletions is obtained by repeatedly calling the next() method. When the sequence is finished, null is returned.> 0

A valid combination for the sequence of combinations for a generated by this class is an array x[] of a integers i, 0 <= i < a.

To see what this class does, try calling SelectionGenerator.testPrint(5, 3), for instance.

Version:

$Id: $Id

Author:

josephramsey

Constructor Summary

Constructors

Constructor	Description
SelectionGenerator(int a)	Constructs a new selection generator for a items.

Method Summary

Modifier and Type	Method	Description
int	getA()	Getter for the field a.
int[]	next()	next.
static void	testPrint(int a)	This static method will print the series of combinations for a choose b to System.out.

Methods inherited from class java.lang.Object

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

Constructor Details

SelectionGenerator

public SelectionGenerator(int a)

Constructs a new selection generator for a items. Once this initialization has been performed, successive calls to next() will produce the series of selections.

Parameters:

a - the number of objects being selected from.

Method Details

testPrint

public static void testPrint(int a)

This static method will print the series of combinations for a choose b to System.out.

Parameters:

a - the number of objects being selected from.

next

public int[] next()

next.

Returns:

the next selection in the series, or null if the series is finished.

getA

public int getA()

Getter for the field a.

Returns:

Ibid.