de.aitools.iv.mds.util
Class VectorOperation

java.lang.Object
  de.aitools.iv.mds.util.VectorOperation

public class VectorOperation
extends java.lang.Object

Author:

Anita

Constructor Summary

VectorOperation()

Method Summary

static double[]	add(double[] v1, double[] v2) Addition.
static double	lengthOf(double[] v) Length of input vector.
static double	scalarProduct(double[] v1, double[] v2) Scalar product of input vectors.
static double[]	scale(double[] v, double factor) Scales vector with input factor.
static double[]	sub(double[] v1, double[] v2) Substraction.
static double[]	unitVector(double[] v) Calculates unit vector of input vector.

Methods inherited from class java.lang.Object

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

Constructor Detail

VectorOperation

public VectorOperation()

Method Detail

sub

public static final double[] sub(double[] v1,
                                 double[] v2)

Substraction.

Returns:

array = v1 - v2

add

public static final double[] add(double[] v1,
                                 double[] v2)

Addition.

Returns:

array = v1 + v2

scalarProduct

public static final double scalarProduct(double[] v1,
                                         double[] v2)

Scalar product of input vectors.

Returns:

double = sum_i=0..v1.length ( v1[i] * v2[i] )

lengthOf

public static final double lengthOf(double[] v)

Length of input vector.

Returns:

length of vector

scale

public static final double[] scale(double[] v,
                                   double factor)

Scales vector with input factor.

Returns:

array = v * factor

unitVector

public static final double[] unitVector(double[] v)

Calculates unit vector of input vector.

Returns:

array = v / |v|