netkit.util
Class VectorMath

java.lang.Object
  netkit.util.VectorMath

public class VectorMath
extends java.lang.Object

Field Summary

static java.util.Random

pickRandom

Constructor Summary

VectorMath()

Method Summary

static void	add(double[] arr1, double[] arr2) Add array 2 into array 1
static void	divide(double[] arr, double div) Divide array by given factor
static double	dotproduct(double[] arr1, double[] arr2)
static int	dotproduct(int[] arr1, int[] arr2)
static boolean	equals(double[] arr1, double[] arr2) check if arrays are identical
static boolean	equals(double[] arr1, double[] arr2, double epsilon) check if arrays have at most epsilon difference at each index
static int	getMaxIdx(double[] vals)
static int	getMaxIdx(int[] vals)
static double	getMaxValue(double[] vals)
static int	getMaxValue(int[] vals)
static int	getMinIdx(double[] vals)
static int	getMinIdx(int[] vals)
static double	getMinValue(double[] vals)
static int	getMinValue(int[] vals)
static long	getSeed()
static double	l1diff(double[] arr1, double[] arr2)
static double	l1diff(int[] arr1, int[] arr2)
static double	l2_length(double[] e)
static void	l2_normalize(double[] e)
static double	maxDist(double[] arr1, double[] arr2)
static double[]	merge(double alpha, double[] arr1, double[] arr2) combine arrays 1 and 2: result = alpha*arr1 + (1-alpha)*arr2
static void	merge(double alpha, double[] arr1, double[] arr2, double[] result) combine arrays 1 and 2: result = alpha*arr1 + (1-alpha)*arr2
static void	multiply(double[] arr, double factor) Multiply array by given factor
static void	normalize(double[] e)
static void	randomize(double[] array)
static void	randomize(double[] src, double[] dst)
static void	randomize(double[] src, double[] dst, int numItems)
static void	randomize(double[] array, int numItems)
static void	randomize(int[] array)
static void	randomize(int[] array, int numItems)
static void	randomize(int[] src, int[] dst)
static void	randomize(int[] src, int[] dst, int numItems)
static <T> void	randomize(T[] array)
static <T> void	randomize(T[] array, int numItems)
static <T> void	randomize(T[] src, T[] dst)
static <T> void	randomize(T[] src, T[] dst, int numItems)
static int	sampleIdx(double[] vals)
static void	setSeed(long seed)
static void	subtract(double[] arr1, double[] arr2) Subtract array 2 from array 1
static double	sum(double[] array)
static int	sum(int[] array)

Methods inherited from class java.lang.Object

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

Field Detail

pickRandom

public static java.util.Random pickRandom

Constructor Detail

VectorMath

public VectorMath()

Method Detail

sum

public static double sum(double[] array)

sum

public static int sum(int[] array)

dotproduct

public static double dotproduct(double[] arr1,
                                double[] arr2)

dotproduct

public static int dotproduct(int[] arr1,
                             int[] arr2)

l1diff

public static double l1diff(double[] arr1,
                            double[] arr2)

l1diff

public static double l1diff(int[] arr1,
                            int[] arr2)

merge

public static double[] merge(double alpha,
                             double[] arr1,
                             double[] arr2)

combine arrays 1 and 2: result = alpha*arr1 + (1-alpha)*arr2

Parameters:

alpha -

arr1 -

arr2 -

Returns:

alpha*arr1 + (1-alpha)*arr2

merge

public static void merge(double alpha,
                         double[] arr1,
                         double[] arr2,
                         double[] result)

combine arrays 1 and 2: result = alpha*arr1 + (1-alpha)*arr2

Parameters:

alpha -

arr1 -

arr2 -

result -

l2_length

public static double l2_length(double[] e)

l2_normalize

public static void l2_normalize(double[] e)

normalize

public static void normalize(double[] e)

add

public static void add(double[] arr1,
                       double[] arr2)

Add array 2 into array 1

Parameters:

arr1 -

arr2 -

subtract

public static void subtract(double[] arr1,
                            double[] arr2)

Subtract array 2 from array 1

Parameters:

arr1 -

arr2 -

divide

public static void divide(double[] arr,
                          double div)

Divide array by given factor

Parameters:

arr -

div -

multiply

public static void multiply(double[] arr,
                            double factor)

Multiply array by given factor

Parameters:

arr -

factor -

equals

public static boolean equals(double[] arr1,
                             double[] arr2)

check if arrays are identical

Parameters:

arr1 -

arr2 -

equals

public static boolean equals(double[] arr1,
                             double[] arr2,
                             double epsilon)

check if arrays have at most epsilon difference at each index

Parameters:

arr1 -

arr2 -

epsilon -

maxDist

public static double maxDist(double[] arr1,
                             double[] arr2)

setSeed

public static void setSeed(long seed)

getSeed

public static long getSeed()

randomize

public static <T> void randomize(T[] array)

randomize

public static <T> void randomize(T[] array,
                                 int numItems)

randomize

public static <T> void randomize(T[] src,
                                 T[] dst)

randomize

public static <T> void randomize(T[] src,
                                 T[] dst,
                                 int numItems)

randomize

public static void randomize(int[] array)

randomize

public static void randomize(int[] array,
                             int numItems)

randomize

public static void randomize(int[] src,
                             int[] dst)

randomize

public static void randomize(int[] src,
                             int[] dst,
                             int numItems)

randomize

public static void randomize(double[] array)

randomize

public static void randomize(double[] array,
                             int numItems)

randomize

public static void randomize(double[] src,
                             double[] dst)

randomize

public static void randomize(double[] src,
                             double[] dst,
                             int numItems)

sampleIdx

public static int sampleIdx(double[] vals)

getMaxIdx

public static int getMaxIdx(double[] vals)

getMinIdx

public static int getMinIdx(double[] vals)

getMaxValue

public static double getMaxValue(double[] vals)

getMinValue

public static double getMinValue(double[] vals)

getMaxIdx

public static int getMaxIdx(int[] vals)

getMinIdx

public static int getMinIdx(int[] vals)

getMaxValue

public static int getMaxValue(int[] vals)

getMinValue

public static int getMinValue(int[] vals)