magpie.utility

Class MathUtils

java.lang.Object

magpie.utility.MathUtils

public class MathUtils
extends java.lang.Object

Math operations that are simple and useful for many operations

Constructor Summary

Constructors

Constructor and Description
MathUtils()

Method Summary

Modifier and Type	Method and Description
static int	gcd(int a, int b) Calculate the greatest common denominator of two integers.
static double	meanAbsoluteDeviation(double[] x) Compute the mean absolute deviation from the mean.
static double	meanAbsoluteDeviation(double[] x, double mean) Compute the mean absolute deviation from the mean.
static java.util.Iterator<int[]>	permutationIterator(int n, int k) Iterator over all permutations of k choices of n integers.
static double[][]	transpose(double[][] x) Transpose a rectangular array

Methods inherited from class java.lang.Object

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

Constructor Detail

MathUtils

public MathUtils()

Method Detail

transpose

public static double[][] transpose(double[][] x)

Transpose a rectangular array

Parameters:

x - Array to transpose

Returns:

Transposed array

gcd

public static int gcd(int a,
                      int b)

Calculate the greatest common denominator of two integers.

Parameters:

a - Integer #1

b - Integer #1

Returns:

gcd(a,b)

meanAbsoluteDeviation

public static double meanAbsoluteDeviation(double[] x,
                                           double mean)

Compute the mean absolute deviation from the mean.

Parameters:

x - List of values

mean - Mean of x

Returns:

Mean absolution deviation

meanAbsoluteDeviation

public static double meanAbsoluteDeviation(double[] x)

Compute the mean absolute deviation from the mean.

Parameters:

x - List of values

Returns:

Mean absolution deviation

permutationIterator

public static java.util.Iterator<int[]> permutationIterator(int n,
                                                            int k)

Iterator over all permutations of k choices of n integers.

Parameters:

n - Size of subsets from which permutations are selected

k - Number of entries to select

Returns:

Iterators over all permutations, no order guaranteed