edu.tum.cs.commons.math
Class MathUtils

java.lang.Object
  edu.tum.cs.commons.math.MathUtils

public class MathUtils
extends Object

Collection of math utility methods.

Version:

$Rev: 29788 $

Author:

deissenb, $Author: juergens $

Rating:

GREEN Hash: AC3B3CC253965F47E5F474B132F7F59B

Constructor Summary

MathUtils()

Method Summary

static double	aggregate(Collection<? extends Number> values, EAggregationStrategy aggregation) Aggregate collections of values with a given aggregation strategy.
static long	factorial(int n) Computes the factorial of n.
static boolean	isNormal(double number) Checks if the provided number is neither infinite nor NaN.
static double	max(Collection<? extends Number> collection) Find maximum.
static double	mean(Collection<? extends Number> collection) Find mean.
static double	median(Collection<? extends Number> collection) Find median.
static double	min(Collection<? extends Number> collection) Find minimum.
static double	sum(Collection<? extends Number> collection) Sum values.

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

sum

public static double sum(Collection<? extends Number> collection)

Sum values.

See Also:

SumAggregator, EAggregationStrategy.SUM

max

public static double max(Collection<? extends Number> collection)

Find maximum.

See Also:

MaxAggregator, EAggregationStrategy.MAX

min

public static double min(Collection<? extends Number> collection)

Find minimum.

See Also:

MinAggregator, EAggregationStrategy.MIN

mean

public static double mean(Collection<? extends Number> collection)

Find mean.

Returns:

Double.NaN for empty input collection

See Also:

MeanAggregator, EAggregationStrategy.MEAN

median

public static double median(Collection<? extends Number> collection)

Find median.

Returns:

Double.NaN for empty input collection

See Also:

MedianAggregator, EAggregationStrategy.MEDIAN

aggregate

public static double aggregate(Collection<? extends Number> values,
                               EAggregationStrategy aggregation)

Aggregate collections of values with a given aggregation strategy.

Returns:

certain aggregation strategies may return Double.NaN for empty input collections

factorial

public static long factorial(int n)

Computes the factorial of n. Errors are not handled. If n is negative, 1 will be returned. If n to too large, wrong results will be produced due to numerical overflow.

isNormal

public static boolean isNormal(double number)

Checks if the provided number is neither infinite nor NaN.