Package edu.cmu.tetrad.util

Class MathUtils

java.lang.Object

edu.cmu.tetrad.util.MathUtils

public class MathUtils
extends Object

Some extra mathematical functions not contained in org.apache.commons.math3.util.FastMath.

Version:

$Id: $Id

Author:

josephramsey

Method Summary

Modifier and Type	Method	Description
static int	choose(int a, int b)	choose.
static int	factorial(int n)	factorial.
static double	logChoose(int a, int b)	logChoose.
static double	logFactorial(int n)	logFactorial.
static double	logistic(double x)	logistic.

Methods inherited from class java.lang.Object

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

Method Details

logistic

public static double logistic(double x)

logistic.

Parameters:

x - a double value.

Returns:

the logistic function of x = 1 / (1 + exp(-x)).

factorial

public static int factorial(int n)

factorial.

Parameters:

n - a int

Returns:

a int

logFactorial

public static double logFactorial(int n)

logFactorial.

Parameters:

n - a int

Returns:

a double

choose

public static int choose(int a,
 int b)

choose.

Parameters:

a - a int

b - a int

Returns:

a int

logChoose

public static double logChoose(int a,
 int b)

logChoose.

Parameters:

a - a int

b - a int

Returns:

a double