genius.core.list

Class MathTools

java.lang.Object

genius.core.list.MathTools

public class MathTools
extends java.lang.Object

Basic computations

Constructor Summary

Constructors

Constructor and Description
MathTools()

Method Summary

Modifier and Type	Method and Description
static java.math.BigInteger	factorial(int n) Computes factorial.
static java.math.BigInteger	over(int n, int k)

Methods inherited from class java.lang.Object

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

Constructor Detail

MathTools

public MathTools()

Method Detail

factorial

public static java.math.BigInteger factorial(int n)

Computes factorial. Also works for big numbers like n > 15

Parameters:

n - input value

Returns:

n!

over

public static java.math.BigInteger over(int n,
                                        int k)

Parameters:

n - top coefficient. Positive number

k - bottom coeffiecient, in range [1, n].

Returns:

binomial coefficient n over k which equals to n! / (k! (n-k)!).