mikera.vectorz.util

Class IntArrays

java.lang.Object

mikera.vectorz.util.IntArrays

public class IntArrays
extends java.lang.Object

Field Summary

Fields

Modifier and Type	Field and Description
static int[]	EMPTY_INT_ARRAY

Method Summary

Modifier and Type	Method and Description
static void	add(int[] as, int v)
static long	arrayProduct(int[] vs) Computes the product of an array of integers.
static long	arrayProduct(int[] vs, int from, int to)
static int[]	calcStrides(int[] shape) Computes the standard packed array strides for a given shape.
static int[]	concat(int[] as, int[] bs) Concatenates two integer arrays.
static int[]	consArray(int a, int[] as)
static double[]	copyIntsToDoubles(int[] src, int srcOffset, double[] dst, int dstOffset, int length)
static long[]	copyIntsToLongs(int[] src)
static long[]	copyIntsToLongs(int[] src, long[] dst)
static int[]	copyOf(int[] data)
static int[]	copyOf(long[] xs)
static int[]	create(double[] ls)
static int[]	create(int size) Creates a new int array.
static int[]	create(java.util.List<?> ls)
static int[]	create(java.lang.Object o)
static int[]	decrementAll(int[] xs)
static int	dotProduct(int[] xs, int[] ys)
static boolean	equals(int[] as, int[] bs) Tests if two int array scontain equal values.
static int[]	incrementAll(int[] xs)
static int	indexLookup(int[] data, int i) Finds the position of a value in a sorted index, or -1 if before the array.
static int	indexPosition(int[] data, int x)
static int	indexPosition(int[] data, int x, int min, int max)
static int[]	insert(int[] data, int position, int value) Inserts a new integer value into a specified position in an int[] array.
static int[]	intersectSorted(int[] xs, int[] ys) Intersects two distinct sorted integer arrays, returning the intersection of all values WARNINGS: 1.
static boolean	isRange(int[] as)
static boolean	isZero(int[] as)
static int[]	mergeSorted(int[] xs, int[] ys) Merges two distinct sorted integer arrays, returning the union of all values WARNINGS: 1.
static int[]	of(int... ints)
static int[]	rand(int[] shape) Creates a randomised int[] array, each element in the range [0..max) where max is the corresponding element in the shape array
static int[]	rand(int[] shape, java.util.Random r)
static int[]	removeIndex(int[] data, int index) Removes an element from a specified position in an int[] array.
static int[]	reverse(int[] data)
static int	seekPosition(int[] data, int i)
static int	seekPosition(int[] data, int i, int min, int max)
static int[]	select(int[] source, int... inds)
static void	swap(int[] inds, int a, int b)
static int[]	tailArray(int[] as)
static boolean	validIndex(int[] as, int[] shape)

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_INT_ARRAY

public static final int[] EMPTY_INT_ARRAY

Method Detail

of

public static int[] of(int... ints)

create

public static int[] create(java.lang.Object o)

create

public static int[] create(int size)

Creates a new int array. Use the default EMPTY_INT_ARRAY if requested size is zero

Parameters:

size -

Returns:

create

public static int[] create(double[] ls)

create

public static int[] create(java.util.List<?> ls)

removeIndex

public static int[] removeIndex(int[] data,
                                int index)

Removes an element from a specified position in an int[] array.

Parameters:

data -

index -

Returns:

A new array copy with one element removed

reverse

public static int[] reverse(int[] data)

consArray

public static int[] consArray(int a,
                              int[] as)

tailArray

public static int[] tailArray(int[] as)

copyIntsToLongs

public static long[] copyIntsToLongs(int[] src,
                                     long[] dst)

copyIntsToDoubles

public static double[] copyIntsToDoubles(int[] src,
                                         int srcOffset,
                                         double[] dst,
                                         int dstOffset,
                                         int length)

copyIntsToLongs

public static long[] copyIntsToLongs(int[] src)

arrayProduct

public static long arrayProduct(int[] vs)

Computes the product of an array of integers.

Parameters:

vs -

Returns:

arrayProduct

public static long arrayProduct(int[] vs,
                                int from,
                                int to)

calcStrides

public static final int[] calcStrides(int[] shape)

Computes the standard packed array strides for a given shape.

Parameters:

shape -

Returns:

equals

public static boolean equals(int[] as,
                             int[] bs)

Tests if two int array scontain equal values.

Parameters:

as -

bs -

Returns:

rand

public static int[] rand(int[] shape)

Creates a randomised int[] array, each element in the range [0..max) where max is the corresponding element in the shape array

Parameters:

shape -

Returns:

rand

public static int[] rand(int[] shape,
                         java.util.Random r)

dotProduct

public static int dotProduct(int[] xs,
                             int[] ys)

indexLookup

public static final int indexLookup(int[] data,
                                    int i)

Finds the position of a value in a sorted index, or -1 if before the array.

seekPosition

public static int seekPosition(int[] data,
                               int i)

seekPosition

public static int seekPosition(int[] data,
                               int i,
                               int min,
                               int max)

indexPosition

public static int indexPosition(int[] data,
                                int x)

indexPosition

public static int indexPosition(int[] data,
                                int x,
                                int min,
                                int max)

decrementAll

public static int[] decrementAll(int[] xs)

incrementAll

public static int[] incrementAll(int[] xs)

swap

public static void swap(int[] inds,
                        int a,
                        int b)

copyOf

public static final int[] copyOf(int[] data)

isZero

public static boolean isZero(int[] as)

isRange

public static boolean isRange(int[] as)

insert

public static int[] insert(int[] data,
                           int position,
                           int value)

Inserts a new integer value into a specified position in an int[] array. Returns a new int[] array.

Parameters:

data -

position -

value -

Returns:

mergeSorted

public static int[] mergeSorted(int[] xs,
                                int[] ys)

Merges two distinct sorted integer arrays, returning the union of all values WARNINGS: 1. may return one of the original arrays. 2. Does not check for consistency of input.

Parameters:

xs -

ys -

Returns:

intersectSorted

public static int[] intersectSorted(int[] xs,
                                    int[] ys)

Intersects two distinct sorted integer arrays, returning the intersection of all values WARNINGS: 1. may return one of the original arrays. 2. Does not check for consistency of input.

Parameters:

xs -

ys -

Returns:

validIndex

public static boolean validIndex(int[] as,
                                 int[] shape)

select

public static int[] select(int[] source,
                           int... inds)

add

public static void add(int[] as,
                       int v)

copyOf

public static int[] copyOf(long[] xs)

concat

public static int[] concat(int[] as,
                           int[] bs)

Concatenates two integer arrays. If one is empty, returns the other unchanged.

Parameters:

as -

bs -

Returns: