MathTools

java.lang.Object

org.tweetyproject.commons.util.MathTools

public class MathTools extends Object

This class contains some useful math tools.

Author:: Matthias Thimm

Constructor Summary

Constructors

Constructor

Description

MathTools()

Constructor
Method Summary

Modifier and Type

Method

Description

static Pair<Double,Double>

averageAndVariance(Collection<Double> values)

Compute the average value and the variance of the given list of numbers.

static Integer

binomial(Integer n, Integer k)

This method computes "n choose k".

static int

faculty(int i)

Computes the faculty of the given number.

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details
- MathTools
  
  public MathTools()
  
  Constructor
Method Details
- binomial
  
  public static Integer binomial(Integer n, Integer k)
  
  This method computes "n choose k". If n < 0 or k < 0 the result is defined to be 0.
  
  Parameters:
  
  n - an integer.
  
  k - an integer
  
  Returns:
  
  the value of "n choose k".
- faculty
  
  public static int faculty(int i)
  
  Computes the faculty of the given number.
  
  Parameters:
  
  i - an integer.
  
  Returns:
  
  the value 1*...*i or 1 if i==0.
- averageAndVariance
  
  public static Pair<Double,Double> averageAndVariance(Collection<Double> values)
  
  Compute the average value and the variance of the given list of numbers.
  
  Parameters:
  
  values - some values
  
  Returns:
  
  a pair of average value (first element) and variance (second element).