com.chemaxon.descriptors.common.realvector

Class Util

java.lang.Object

com.chemaxon.descriptors.common.realvector.Util

public final class Util
extends Object

Utilities related to float vector descriptors.

Method Summary

Modifier and Type	Method and Description
static byte[]	bytesFromFloats(float[] fp) Serialize floats to byte array.
static byte[]	bytesFromShorts(short[] fp) Serialize shorts to byte array.
static double	euclideanNorm(float[] fp) Euclidean norm of floats.
static float[]	floatsFromBytes(byte[] serialized, int length) Deserialize byte arrays to floats.
static String	floatsToDecimalString(float[] fp) Create tab sep string from floats.
static double	manhattanNorm(float[] fp) Manhattan norm of floats.
static double	maximumNorm(float[] fp) Maximum norm of floats.
static float[]	parseStringToFloats(String decimalString, int length) Parse space/tab sep floats string.
static short[]	shortsFromBytes(byte[] serialized, int length) Pack bytes to shorts.

Methods inherited from class java.lang.Object

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

Method Detail

parseStringToFloats

public static float[] parseStringToFloats(String decimalString,
                                          int length)

Parse space/tab sep floats string.

Parameters:

decimalString - Input String

length - Expected length

Returns:

Parsed array

floatsToDecimalString

public static String floatsToDecimalString(float[] fp)

Create tab sep string from floats.

Parameters:

fp - Floats

Returns:

Tab sep String

shortsFromBytes

public static short[] shortsFromBytes(byte[] serialized,
                                      int length)

Pack bytes to shorts. This is an inverse of floatsFromBytes(byte[], int).

Parameters:

serialized - bytes representation

length - Expected fingerprint length

Returns:

deserialized shorts representation

floatsFromBytes

public static float[] floatsFromBytes(byte[] serialized,
                                      int length)

Deserialize byte arrays to floats. Inverse of bytesFromFloats(float[]).

Parameters:

serialized - Byte array representation

length - Expected length of the floats form

Returns:

Floats form

bytesFromFloats

public static byte[] bytesFromFloats(float[] fp)

Serialize floats to byte array. Inverse of floatsFromBytes(byte[], int)

Parameters:

fp - Floats

Returns:

Byte array representation

bytesFromShorts

public static byte[] bytesFromShorts(short[] fp)

Serialize shorts to byte array. Inverse of shortsFromBytes(byte[], int)

Parameters:

fp - Shorts

Returns:

Byte array representation

euclideanNorm

public static double euclideanNorm(float[] fp)

Euclidean norm of floats.

Parameters:

fp - Floats

Returns:

Euclidean norm

manhattanNorm

public static double manhattanNorm(float[] fp)

Manhattan norm of floats.

Parameters:

fp - Floats

Returns:

Manhattan norm

maximumNorm

public static double maximumNorm(float[] fp)

Maximum norm of floats.

Parameters:

fp - Floats

Returns:

Maximum norm