edu.umass.cs.mallet.base.util

Class ArrayUtils

java.lang.Object

edu.umass.cs.mallet.base.util.ArrayUtils

public final class ArrayUtils
extends Object

Static utility methods for arrays (like java.util.Arrays, but more useful).

Version:

$Id: ArrayUtils.java,v 1.8 2005/09/21 01:22:18 casutton Exp $

Author:

Charles Sutton

Method Summary

Modifier and Type	Method and Description
static boolean	any(TDoubleProcedure proc, double[] v) Returns true if the procedure proc returns true for any element of the array v.
static boolean	any(TObjectProcedure proc, Object[][] v) Returns true if the procedure proc returns true for any element of the array v.
static boolean[]	append(boolean[] v, boolean elem) Returns a new array with a single element appended at the end.
static int[]	append(int[] v, int elem) Returns a new array with a single element appended at the end.
static Object[]	append(Object[] v, Object elem) Returns a new array with a single element appended at the end.
static int	argmax(double[] elems)
static double	count(int[] sampled, int val) Returns the number of times a value occurs in a given array.
static boolean	equals(boolean[][] m1, boolean[][] m2)
static void	forEach(TObjectProcedure proc, Object[] v)
static void	forEach(TObjectProcedure proc, Object[][] v)
static int	indexOf(int[] array, int obj)
static int	indexOf(Object[] array, Object obj)
static void	print(double[] v)
static void	print(int[] v)
static String	toString(double[] v)
static String	toString(int[] v)

Methods inherited from class java.lang.Object

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

Method Detail

indexOf

public static int indexOf(Object[] array,
                          Object obj)

indexOf

public static int indexOf(int[] array,
                          int obj)

any

public static boolean any(TDoubleProcedure proc,
                          double[] v)

Returns true if the procedure proc returns true for any element of the array v.

any

public static boolean any(TObjectProcedure proc,
                          Object[][] v)

Returns true if the procedure proc returns true for any element of the array v.

forEach

public static void forEach(TObjectProcedure proc,
                           Object[] v)

forEach

public static void forEach(TObjectProcedure proc,
                           Object[][] v)

print

public static void print(double[] v)

print

public static void print(int[] v)

toString

public static String toString(int[] v)

toString

public static String toString(double[] v)

append

public static int[] append(int[] v,
                           int elem)

Returns a new array with a single element appended at the end. Use this sparingly, for it will allocate a new array. You can easily turn a linear-time algorithm to quadratic this way.

Parameters:

v - Original array

elem - Element to add to end

append

public static boolean[] append(boolean[] v,
                               boolean elem)

Returns a new array with a single element appended at the end. Use this sparingly, for it will allocate a new array. You can easily turn a linear-time algorithm to quadratic this way.

Parameters:

v - Original array

elem - Element to add to end

append

public static Object[] append(Object[] v,
                              Object elem)

Returns a new array with a single element appended at the end. Use this sparingly, for it will allocate a new array. You can easily turn a linear-time algorithm to quadratic this way.

Parameters:

v - Original array

elem - Element to add to end

Returns:

Array with length v+1 that is (v0,v1,...,vn,elem). Runtime type will be same as he pased-in array.

count

public static double count(int[] sampled,
                           int val)

Returns the number of times a value occurs in a given array.

argmax

public static int argmax(double[] elems)

equals

public static boolean equals(boolean[][] m1,
                             boolean[][] m2)