jbil.util
Class BooleanArrayUtilities

java.lang.Object
  jbil.util.BooleanArrayUtilities

public class BooleanArrayUtilities
extends java.lang.Object

Assorted boolean utility functions.

Author:

Paulo G. S. da Fonseca

Constructor Summary

BooleanArrayUtilities()

Method Summary

static boolean[]	asIndicatorVector(int size, int[] trueElements) Creates an indicator array (boolean mask) from its size and the indexes of the true elements.
static int[]	falseIndexes(boolean[] b) Returns an int array containing the indexes of the false entries of a boolean array.
static int	falseIndexesCount(boolean[] b) Counts the false entries of a boolean array.
static void	invert(boolean[] b) Inverts a boolean array.
static int[]	trueIndexes(boolean[] b) Returns an int array containing the indexes of the true entries of a boolean array.
static int	trueIndexesCount(boolean[] b) Counts the true entries of a boolean array.

Methods inherited from class java.lang.Object

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

Constructor Detail

BooleanArrayUtilities

public BooleanArrayUtilities()

Method Detail

trueIndexesCount

public static int trueIndexesCount(boolean[] b)

Counts the true entries of a boolean array.

trueIndexes

public static int[] trueIndexes(boolean[] b)

Returns an int array containing the indexes of the true entries of a boolean array. For example, trueIndexes({true,false, false, true}) gives {0,3}.

falseIndexesCount

public static int falseIndexesCount(boolean[] b)

Counts the false entries of a boolean array.

falseIndexes

public static int[] falseIndexes(boolean[] b)

Returns an int array containing the indexes of the false entries of a boolean array. For example, trueIndexes({true,false, false, true}) gives {1,2}.

asIndicatorVector

public static boolean[] asIndicatorVector(int size,
                                          int[] trueElements)

Creates an indicator array (boolean mask) from its size and the indexes of the true elements. For example, asIndicatorVector(5, {2,3}) gives {false, false, true, true, false}.

Parameters:

size - The size of the indicator vector.

trueElements - The indexes of the true elements.

invert

public static void invert(boolean[] b)

Inverts a boolean array.

Parameters:

b - The array to be inverted.