com.intersult.ai.util

Class Num

java.lang.Object

com.intersult.ai.util.Num

public final class Num
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
static double	LOG2
static double	PI_2
static Random	random
static double	SQRT_PI_2

Constructor Summary

Constructors

Constructor and Description
Num()

Method Summary

Methods

Modifier and Type	Method and Description
static long	binomial(int n, int k)
static long	combine(long x, long y)
static double	factorial(int n)
static int	factorialInt(int n)
static double	gamma(double x) Very coarse Stirling approximation of Gamma(x) = (x - 1)!
static int	getInteger(boolean[] bool)
static double	hypervolume(double r, double n) Hypervolume of sphere with radius r and dimension n.
static void	index(int[] array)
static double	ld(BigInteger x)
static double	log(BigInteger x)
static long	log2(long x)
static double[]	multiply(double[] x, double y)
static double	nextPoisson()
static double	quad(double value)
static void	randomizeFactor(double[] array)
static void	randomizeFactor(double[] array, int startIndex, int endIndex, double product)
static void	randomizeGauss(double[] array)
static void	randomizeRot(double[] array) Creates randomly rotated vector of given array dimension sum array[i]^2 = 1 (Length is 1) E(array[i]) is equally distributed over i E(array[i]^2) is equally distributed over i E(array[i] * array[i + 1]) = 0 means no correlation between components
static void	rotate(double[] array, int index, double sin)
static void	rotatePhi(double[] array, int x, int y, double phi)
static double	scalar(double[] x, double[] y)
static void	setInteger(boolean[] bool, int value)
static double	sgnSqrt(double value)
static double	significance(long a, long b, long k, long n)
static int	simpleBinomial(int n, int k)
static long	splitX(long z)
static long	splitY(long z)
static int	sqr(int x)
static int	sqr4(int x)
static double[]	subtract(double[] x, double[] y)
static String	toBinaryString(BigInteger number, int bits)
static long	toNumber(String string)
static String	toString(double[] values)
static String	toString(long number)

Methods inherited from class java.lang.Object

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

Field Detail

random

public static final Random random

LOG2

public static final double LOG2

PI_2

public static final double PI_2

See Also:

Constant Field Values

SQRT_PI_2

public static final double SQRT_PI_2

Constructor Detail

Num

public Num()

Method Detail

combine

public static long combine(long x,
           long y)

splitX

public static long splitX(long z)

splitY

public static long splitY(long z)

toNumber

public static long toNumber(String string)

toString

public static String toString(long number)

toBinaryString

public static String toBinaryString(BigInteger number,
                    int bits)

significance

public static double significance(long a,
                  long b,
                  long k,
                  long n)

scalar

public static double scalar(double[] x,
            double[] y)

multiply

public static double[] multiply(double[] x,
                double y)

subtract

public static double[] subtract(double[] x,
                double[] y)

toString

public static String toString(double[] values)

randomizeGauss

public static void randomizeGauss(double[] array)

randomizeFactor

public static void randomizeFactor(double[] array)

randomizeFactor

public static void randomizeFactor(double[] array,
                   int startIndex,
                   int endIndex,
                   double product)

randomizeRot

public static void randomizeRot(double[] array)

Creates randomly rotated vector of given array dimension

sum array[i]^2 = 1 (Length is 1) E(array[i]) is equally distributed over i E(array[i]^2) is equally distributed over i E(array[i] * array[i + 1]) = 0 means no correlation between components

rotatePhi

public static void rotatePhi(double[] array,
             int x,
             int y,
             double phi)

rotate

public static void rotate(double[] array,
          int index,
          double sin)

nextPoisson

public static double nextPoisson()

quad

public static double quad(double value)

sgnSqrt

public static double sgnSqrt(double value)

index

public static void index(int[] array)

factorial

public static double factorial(int n)

factorialInt

public static int factorialInt(int n)

simpleBinomial

public static int simpleBinomial(int n,
                 int k)

binomial

public static long binomial(int n,
            int k)

ld

public static double ld(BigInteger x)

log

public static double log(BigInteger x)

log2

public static long log2(long x)

gamma

public static double gamma(double x)

Very coarse Stirling approximation of Gamma(x) = (x - 1)!

hypervolume

public static double hypervolume(double r,
                 double n)

Hypervolume of sphere with radius r and dimension n.

getInteger

public static int getInteger(boolean[] bool)

setInteger

public static void setInteger(boolean[] bool,
              int value)

sqr4

public static int sqr4(int x)

sqr

public static int sqr(int x)