nl.cwts.util

Class Arrays

java.lang.Object

nl.cwts.util.Arrays

public final class Arrays
extends java.lang.Object

Utility functions for arrays.

All methods in this class are static.

Method Summary

Modifier and Type	Method and Description
static double	calcAverage(double[] values) Calculates the average of the values in an array.
static double	calcMaximum(double[] values) Calculates the maximum of the values in an array.
static int	calcMaximum(int[] values) Calculates the maximum of the values in an array.
static double	calcMedian(double[] values) Calculates the median of the values in an array.
static double	calcMinimum(double[] values) Calculates the minimum of the values in an array.
static int	calcMinimum(int[] values) Calculates the minimum of the values in an array.
static double	calcSum(double[] values) Calculates the sum of the values in an array.
static double	calcSum(double[] values, int beginIndex, int endIndex) Calculates the sum of the values in an array, considering only array elements within a specified range.
static double[]	createDoubleArrayOfOnes(int nElements) Creates a double array of ones.
static double[]	createDoubleArrayOfRandomNumbers(int nElements) Creates a double array of random numbers.
static double[]	createDoubleArrayOfRandomNumbers(int nElements, java.util.Random random) Creates a double array of random numbers.
static int[]	generateRandomPermutation(int nElements) Generates a random permutation.
static int[]	generateRandomPermutation(int nElements, java.util.Random random) Generates a random permutation.
static void	permuteRandomly(int[] elements, java.util.Random random) Randomly permutes the elements.
static double[]	repeat(double value, int nElements) Creates an integer array of repeated elements.
static int[]	repeat(int value, int nElements) Creates a double array of repeated elements.

Methods inherited from class java.lang.Object

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

Method Detail

calcSum

public static double calcSum(double[] values)

Calculates the sum of the values in an array.

Parameters:

values - Values

Returns:

Sum of values

calcSum

public static double calcSum(double[] values,
                             int beginIndex,
                             int endIndex)

Calculates the sum of the values in an array, considering only array elements within a specified range.

The sum is calculated over the elements values[beginIndex], ..., values[endIndex - 1].

Parameters:

values - Values

beginIndex - Begin index

endIndex - End index

Returns:

Sum of values

calcAverage

public static double calcAverage(double[] values)

Calculates the average of the values in an array.

Parameters:

values - Values

Returns:

Average value

calcMedian

public static double calcMedian(double[] values)

Calculates the median of the values in an array.

Parameters:

values - Values

Returns:

Median value

calcMinimum

public static double calcMinimum(double[] values)

Calculates the minimum of the values in an array.

Parameters:

values - Values

Returns:

Minimum value

calcMaximum

public static double calcMaximum(double[] values)

Calculates the maximum of the values in an array.

Parameters:

values - Values

Returns:

Maximum value

calcMinimum

public static int calcMinimum(int[] values)

Calculates the minimum of the values in an array.

Parameters:

values - Values

Returns:

Minimum value

calcMaximum

public static int calcMaximum(int[] values)

Calculates the maximum of the values in an array.

Parameters:

values - Values

Returns:

Maximum value

createDoubleArrayOfOnes

public static double[] createDoubleArrayOfOnes(int nElements)

Creates a double array of ones.

Parameters:

nElements - Number of elements

Returns:

Array of ones

repeat

public static int[] repeat(int value,
                           int nElements)

Creates a double array of repeated elements.

Parameters:

value - Element to repeat

nElements - Number of elements

Returns:

Array of repeated elements

repeat

public static double[] repeat(double value,
                              int nElements)

Creates an integer array of repeated elements.

Parameters:

value - Element to repeat

nElements - Number of elements

Returns:

Array of repeated elements

createDoubleArrayOfRandomNumbers

public static double[] createDoubleArrayOfRandomNumbers(int nElements)

Creates a double array of random numbers.

Parameters:

nElements - Number of elements

Returns:

Array of random numbers

createDoubleArrayOfRandomNumbers

public static double[] createDoubleArrayOfRandomNumbers(int nElements,
                                                        java.util.Random random)

Creates a double array of random numbers.

Parameters:

nElements - Number of elements

random - Random number generator

Returns:

Array of random numbers

generateRandomPermutation

public static int[] generateRandomPermutation(int nElements)

Generates a random permutation.

A random permutation is generated of the integers 0, ..., nElements - 1.

Parameters:

nElements - Number of elements

Returns:

Random permutation

generateRandomPermutation

public static int[] generateRandomPermutation(int nElements,
                                              java.util.Random random)

Generates a random permutation.

A random permutation is generated of the integers 0, ..., nElements - 1.

Parameters:

nElements - Number of elements

random - Random number generator

Returns:

Random permutation

permuteRandomly

public static void permuteRandomly(int[] elements,
                                   java.util.Random random)

Randomly permutes the elements.

Randomly permutes the elements 0, ..., nElements - 1.

Parameters:

elements - Elements

random - Random number generator