org.chocosolver.util.tools

Class MathUtils

java.lang.Object

org.chocosolver.util.tools.MathUtils

public final class MathUtils
extends Object

various mathematics utilities. The functions do not exist in the basic math package Math.*

Since:

8 dec. 2008 version 2.0.1

Version:

2.0.1

Author:

Arnaud Malapert

Field Summary

Fields

Modifier and Type	Field and Description
static double	ROUNDED_LOG_PRECISION

Method Summary

Methods

Modifier and Type	Method and Description
static Point	bounds(int[] values)
static int	combinaison(int n, int p) it computes the number of combinaison C_n^p.
static int	divCeil(int a, int b)
static int	divFloor(int a, int b)
static long	factoriel(int n) simple recursive version of factorielle
static boolean	isPowerOfTwo(int x)
static double	log(double value, double exponent)
static int	max(int[] values)
static int	max(int[][] values)
static int	min(int[] values)
static int	min(int[][] values)
static int	pow(int value, int exp)
static double	roundedLog(double value, double exponent) a rounded logarithm to avoid issues with jvm dependant math functions
static int	sum(int[] values)
static int	sum(int[][] values)
static int	sum(int[] values, int begin, int end)
static int	sumFrom(int[] values, int begin)
static int	sumTo(int[] values, int end)

Methods inherited from class java.lang.Object

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

Field Detail

ROUNDED_LOG_PRECISION

public static final double ROUNDED_LOG_PRECISION

See Also:

Constant Field Values

Method Detail

factoriel

public static long factoriel(int n)

simple recursive version of factorielle

combinaison

public static int combinaison(int n,
              int p)

it computes the number of combinaison C_n^p. The function is only recursive and do not use an array to store temporary results

Parameters:

n - max cardinality

p - sub cardinality

Returns:

n among k combinations

isPowerOfTwo

public static boolean isPowerOfTwo(int x)

pow

public static int pow(int value,
      int exp)

log

public static double log(double value,
         double exponent)

roundedLog

public static double roundedLog(double value,
                double exponent)

a rounded logarithm to avoid issues with jvm dependant math functions

sum

public static int sum(int[] values,
      int begin,
      int end)

sumFrom

public static int sumFrom(int[] values,
          int begin)

sumTo

public static int sumTo(int[] values,
        int end)

sum

public static int sum(int[] values)

sum

public static int sum(int[][] values)

max

public static int max(int[] values)

max

public static int max(int[][] values)

min

public static int min(int[] values)

min

public static int min(int[][] values)

bounds

public static Point bounds(int[] values)

divFloor

public static int divFloor(int a,
           int b)

divCeil

public static int divCeil(int a,
          int b)