io.inbot.utils

Class Math

java.lang.Object

io.inbot.utils.Math

public class Math
extends Object

Constructor Summary

Constructors

Constructor and Description
Math()

Method Summary

Modifier and Type	Method and Description
static double	normalize(double i, double factor) Useful for normalizing integer or double values to a number between 0 and 1.
static long	pow(long l, int exp)
static double	round(double number, int decimals)
static int	safeAbs(int number) Java Math.pow has an issue with Long and Integer MIN_VALUE where it returns MIN_VALUE.
static long	safeAbs(long number) Java Math.pow has an issue with Long and Integer MIN_VALUE where it returns MIN_VALUE.

Methods inherited from class java.lang.Object

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

Constructor Detail

Math

public Math()

Method Detail

safeAbs

public static long safeAbs(long number)

Java Math.pow has an issue with Long and Integer MIN_VALUE where it returns MIN_VALUE.

Parameters:

number - a number

Returns:

the absolute value

safeAbs

public static int safeAbs(int number)

Java Math.pow has an issue with Long and Integer MIN_VALUE where it returns MIN_VALUE.

Parameters:

number - a number

Returns:

the absolute value

pow

public static long pow(long l,
                       int exp)

Parameters:

l - a long

exp - exponent

Returns:

l to the power of exp

normalize

public static double normalize(double i,
                               double factor)

Useful for normalizing integer or double values to a number between 0 and 1. This uses a simple logistic function: https://en.wikipedia.org/wiki/Logistic_function with some small adaptations:

 (1 / (1 + java.lang.Math.exp(-1 * (factor * i))) - 0.5) * 2
 

Parameters:

i - any positive long

factor - allows you to control how quickly things converge on 1. For values that range between 0 and the low hundreds, something like 0.05 is a good starting point.

Returns:

a double between 0 and 1.

round

public static double round(double number,
                           int decimals)