de.linguatools.disco

Class DenseVector

java.lang.Object

de.linguatools.disco.DenseVector

public class DenseVector
extends java.lang.Object

Basic vector algebra for dense vectors (float arrays).

Constructor Summary

Constructors

Constructor and Description
DenseVector()

Method Summary

Modifier and Type	Method and Description
static float[]	add(float[] v1, float[] v2) Adds the two argument vectors.
static float[]	average(java.util.List<float[]> vectorList) Compute the average vector of all vectors in the list.
static float	dotProduct(float[] v1, float[] v2) Compute the dot product between the argument vectors.
static float[]	mul(float[] v1, float scalarValue) Multiply vector with scalar.
static float[]	mul(float[] v1, float[] v2) Element-wise vector multiplication.
static float[]	sub(float[] v1, float[] v2) Subtracts the second vector from the first.
static float[]	vectorExtrema(float[] v1, float[] v2) Choose for each dimension the highest absolute value.

Methods inherited from class java.lang.Object

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

Constructor Detail

DenseVector

public DenseVector()

Method Detail

add

public static float[] add(float[] v1,
                          float[] v2)

Adds the two argument vectors.

Parameters:

v1 - must have same length as v2

v2 -

Returns:

v1 + v2 or null if argument vectors have different lengths.

sub

public static float[] sub(float[] v1,
                          float[] v2)

Subtracts the second vector from the first.

Parameters:

v1 - must have same length as v2

v2 -

Returns:

v1 - v2 or null if argument vectors have different lengths.

mul

public static float[] mul(float[] v1,
                          float[] v2)

Element-wise vector multiplication.

Parameters:

v1 - must have same length as v2

v2 -

Returns:

resulting vector or null if argument vectors have different lengths.

mul

public static float[] mul(float[] v1,
                          float scalarValue)

Multiply vector with scalar.

Parameters:

v1 -

scalarValue -

Returns:

dotProduct

public static float dotProduct(float[] v1,
                               float[] v2)

Compute the dot product between the argument vectors.

Parameters:

v1 - must have same length as v2

v2 -

Returns:

the dot product (scalar value). Throws a RuntimeException if the argument vectors have different lengths!

vectorExtrema

public static float[] vectorExtrema(float[] v1,
                                    float[] v2)

Choose for each dimension the highest absolute value.

Parameters:

v1 - must have same length as v2

v2 -

Returns:

extrema vector. Throws a RuntimeException if the argument vectors have different lengths!

average

public static float[] average(java.util.List<float[]> vectorList)

Compute the average vector of all vectors in the list.

Parameters:

vectorList -

Returns:

average vector