hex.genmodel.utils

Class MathUtils

java.lang.Object

hex.genmodel.utils.MathUtils

public class MathUtils
extends java.lang.Object

Copied (partially) from water.util.MathUtils

Field Summary

Fields

Modifier and Type	Field and Description
static double	EULER_MASCHERONI_CONSTANT Euler–Mascheroni constant (also called Euler's constant)

Constructor Summary

Constructors

Constructor and Description
MathUtils()

Method Summary

Modifier and Type	Method and Description
static int	combinatorial(int top, int bottom)
static boolean	equalsWithinRecSumErr(double actual, double expected, int n, double absum)
static double	harmonicNumberEstimation(long value) Compute harmonic number estimated by natural logarithm
static int	log2(int n) Fast calculation of log base 2 for integers.
static int	log2(long n)

Methods inherited from class java.lang.Object

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

Field Detail

EULER_MASCHERONI_CONSTANT

public static final double EULER_MASCHERONI_CONSTANT

Euler–Mascheroni constant (also called Euler's constant)

See Also:

Constant Field Values

Constructor Detail

MathUtils

public MathUtils()

Method Detail

equalsWithinRecSumErr

public static boolean equalsWithinRecSumErr(double actual,
                                            double expected,
                                            int n,
                                            double absum)

log2

public static int log2(int n)

Fast calculation of log base 2 for integers.

Returns:

log base 2 of n

log2

public static int log2(long n)

combinatorial

public static int combinatorial(int top,
                                int bottom)

harmonicNumberEstimation

public static double harmonicNumberEstimation(long value)

Compute harmonic number estimated by natural logarithm