Package mathvoyage.combinatorics

Class Combinatorics

java.lang.Object

mathvoyage.combinatorics.Combinatorics

public class Combinatorics
extends Object

The type Combinatorics.

Method Summary

Modifier and Type	Method	Description
double	combination(int n, int r)	Returns combination value.
static ArrayList<ArrayList<Integer>>	generateSubsets(Integer[] set)	Returns subsets of set.
static Combinatorics	getInstance()	Returns the singleton instance of this class.
double	numberOfSubsets(int setSize)	Return number of subsets of a set.
double	permutation(int n, int r)	Returns permutation value.

Methods inherited from class java.lang.Object

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

Method Details

getInstance

public static Combinatorics getInstance()

Returns the singleton instance of this class.

Returns:

The singleton instance

combination

public double combination(int n,
 int r)

Returns combination value.

Parameters:

n - is the total number of items.

r - is the number of items to be chosen.

Returns:

the combination value.

permutation

public double permutation(int n,
 int r)

Returns permutation value.

Parameters:

n - is the total number of items.

r - is the number of items to be arranged.

Returns:

the permutation value.

generateSubsets

public static ArrayList<ArrayList<Integer>> generateSubsets(Integer[] set)

Returns subsets of set.

Parameters:

set - is the set we want to show subsets

Returns:

the subsets of a sets.

numberOfSubsets

public double numberOfSubsets(int setSize)

Return number of subsets of a set.

Parameters:

setSize - is the number of elements of a set.

Returns:

number of subsets of a set.