org.openimaj.math.util.distance

Class HammingUtils

java.lang.Object

org.openimaj.math.util.distance.HammingUtils

public class HammingUtils
extends Object

Utilities for hamming distance calculations. All hamming distance calculations between native types are decomposed into the summation over all bytes in the native type. The hamming distance of byte types is computed through a lookup table.

Author:

Jonathon Hare (jsh2@ecs.soton.ac.uk)

Constructor Summary

Constructors

Constructor and Description
HammingUtils()

Method Summary

Modifier and Type	Method and Description
static int	packedHamming(byte i1, byte i2) Bitwise (assuming packed bit strings) hamming distance
static int	packedHamming(char i1, char i2) Bitwise (assuming packed bit strings) hamming distance
static int	packedHamming(double i1, double i2) Bitwise (assuming packed bit strings) hamming distance
static int	packedHamming(float i1, float i2) Bitwise (assuming packed bit strings) hamming distance
static int	packedHamming(int i1, int i2) Bitwise (assuming packed bit strings) hamming distance
static int	packedHamming(long i1, long i2) Bitwise (assuming packed bit strings) hamming distance
static int	packedHamming(short i1, short i2) Bitwise (assuming packed bit strings) hamming distance
static byte	unpackByte(String bits) Unpack a binary string ("10011...") into a byte
static double	unpackDouble(String bits) Unpack a binary string ("10011...") into a double
static float	unpackFloat(String bits) Unpack a binary string ("10011...") into a float
static int	unpackInt(String bits) Unpack a binary string ("10011...") into an int
static long	unpackLong(String bits) Unpack a binary string ("10011...") into a long
static short	unpackShort(String bits) Unpack a binary string ("10011...") into a short

Methods inherited from class java.lang.Object

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

Constructor Detail

HammingUtils

public HammingUtils()

Method Detail

packedHamming

public static int packedHamming(double i1,
                                double i2)

Bitwise (assuming packed bit strings) hamming distance

Parameters:

i1 - first bit string

i2 - second bit string

Returns:

the hamming distance

packedHamming

public static int packedHamming(float i1,
                                float i2)

Bitwise (assuming packed bit strings) hamming distance

Parameters:

i1 - first bit string

i2 - second bit string

Returns:

the hamming distance

packedHamming

public static int packedHamming(long i1,
                                long i2)

Bitwise (assuming packed bit strings) hamming distance

Parameters:

i1 - first bit string

i2 - second bit string

Returns:

the hamming distance

packedHamming

public static int packedHamming(int i1,
                                int i2)

Bitwise (assuming packed bit strings) hamming distance

Parameters:

i1 - first bit string

i2 - second bit string

Returns:

the hamming distance

packedHamming

public static int packedHamming(byte i1,
                                byte i2)

Bitwise (assuming packed bit strings) hamming distance

Parameters:

i1 - first bit string

i2 - second bit string

Returns:

the hamming distance

packedHamming

public static int packedHamming(char i1,
                                char i2)

Bitwise (assuming packed bit strings) hamming distance

Parameters:

i1 - first bit string

i2 - second bit string

Returns:

the hamming distance

packedHamming

public static int packedHamming(short i1,
                                short i2)

Bitwise (assuming packed bit strings) hamming distance

Parameters:

i1 - first bit string

i2 - second bit string

Returns:

the hamming distance

unpackDouble

public static double unpackDouble(String bits)

Unpack a binary string ("10011...") into a double

Parameters:

bits -

Returns:

a double value with the same bit pattern defined by bits

unpackFloat

public static float unpackFloat(String bits)

Unpack a binary string ("10011...") into a float

Parameters:

bits -

Returns:

a float value with the same bit pattern defined by bits

unpackInt

public static int unpackInt(String bits)

Unpack a binary string ("10011...") into an int

Parameters:

bits -

Returns:

an int value with the same bit pattern defined by bits

unpackLong

public static long unpackLong(String bits)

Unpack a binary string ("10011...") into a long

Parameters:

bits -

Returns:

a long value with the same bit pattern defined by bits

unpackShort

public static short unpackShort(String bits)

Unpack a binary string ("10011...") into a short

Parameters:

bits -

Returns:

a short value with the same bit pattern defined by bits

unpackByte

public static byte unpackByte(String bits)

Unpack a binary string ("10011...") into a byte

Parameters:

bits -

Returns:

a byte value with the same bit pattern defined by bits