cc.mallet.util

Class ArrayUtils

java.lang.Object

cc.mallet.util.ArrayUtils

public final class ArrayUtils
extends java.lang.Object

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

Method Summary

Modifier and Type	Method and Description
static boolean[]	append(boolean[] v, boolean elem) Returns a new array with a single element appended at the end.
static double[]	append(double[] a1, double[] a2) Returns a new array that is the concatenation of a1 and a2.
static int[]	append(int[] v, int elem) Returns a new array with a single element appended at the end.
static int[]	append(int[] a1, int[] a2) Returns a new array that is the concatenation of a1 and a2.
static java.lang.Object[]	append(java.lang.Object[] v, java.lang.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 double[]	extend(double[] a, int additional) Returns a new array containing all of a, with additional extra space added (zero initialized).
static int[]	extend(int[] a, int additional) Returns a new array containing all of a, with additional extra space added (zero initialized).
static int	indexOf(int[] array, int obj)
static int	indexOf(java.lang.Object[] array, java.lang.Object obj)
static void	print(double[] v)
static void	print(int[] v)
static java.lang.String	toString(double[] v)
static java.lang.String	toString(int[] v)
static java.lang.String	toString(java.lang.Object[] v)

Methods inherited from class java.lang.Object

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

Method Detail

indexOf

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

indexOf

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

print

public static void print(double[] v)

print

public static void print(int[] v)

toString

public static java.lang.String toString(int[] v)

toString

public static java.lang.String toString(double[] v)

toString

public static java.lang.String toString(java.lang.Object[] v)

extend

public static int[] extend(int[] a,
                           int additional)

Returns a new array containing all of a, with additional extra space added (zero initialized).

Parameters:

a -

additional -

Returns:

extend

public static double[] extend(double[] a,
                              int additional)

Returns a new array containing all of a, with additional extra space added (zero initialized).

Parameters:

a -

additional -

Returns:

append

public static int[] append(int[] a1,
                           int[] a2)

Returns a new array that is the concatenation of a1 and a2.

Parameters:

a1 -

a2 -

Returns:

append

public static double[] append(double[] a1,
                              double[] a2)

Returns a new array that is the concatenation of a1 and a2.

Parameters:

a1 -

a2 -

Returns:

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 java.lang.Object[] append(java.lang.Object[] v,
                                        java.lang.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)