Package org.apache.spark.ml.linalg

Class DenseVector

Object

org.apache.spark.ml.linalg.DenseVector

All Implemented Interfaces:

Serializable, Vector

public class DenseVector
extends Object
implements Vector

A dense vector represented by a value array.

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
DenseVector(double[] values)

Method Summary

Modifier and Type	Method	Description
double	apply(int i)	Gets the value of the ith element.
int	argmax()	Find the index of a maximal element.
DenseVector	copy()	Makes a deep copy of this vector.
boolean	equals(Object other)
int	hashCode()	Returns a hash code value for the vector.
int	numActives()	Number of active entries.
int	numNonzeros()	Number of nonzero elements.
int	size()	Size of the vector.
double[]	toArray()	Converts the instance to a double array.
String	toString()
static scala.Option<double[]>	unapply(DenseVector dv)	Extracts the value array from a dense vector.
double[]	values()

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.spark.ml.linalg.Vector

compressed, compressedWithNNZ, dot, foreach, foreachActive, foreachNonZero, nonZeroIterator, toDense, toSparse

Constructor Details

DenseVector

public DenseVector(double[] values)

Method Details

unapply

public static scala.Option<double[]> unapply(DenseVector dv)

Extracts the value array from a dense vector.

values

public double[] values()

size

public int size()

Description copied from interface: Vector

Size of the vector.

Specified by:

size in interface Vector

Returns:

(undocumented)

toString

public String toString()

Overrides:

toString in class Object

toArray

public double[] toArray()

Description copied from interface: Vector

Converts the instance to a double array.

Specified by:

toArray in interface Vector

Returns:

(undocumented)

apply

public double apply(int i)

Description copied from interface: Vector

Gets the value of the ith element.

Specified by:

apply in interface Vector

Parameters:

i - index

Returns:

(undocumented)

copy

public DenseVector copy()

Description copied from interface: Vector

Makes a deep copy of this vector.

Specified by:

copy in interface Vector

Returns:

(undocumented)

equals

public boolean equals(Object other)

Specified by:

equals in interface Vector

Overrides:

equals in class Object

hashCode

public int hashCode()

Description copied from interface: Vector

Returns a hash code value for the vector. The hash code is based on its size and its first 128 nonzero entries, using a hash algorithm similar to java.util.Arrays.hashCode.

Specified by:

hashCode in interface Vector

Overrides:

hashCode in class Object

Returns:

(undocumented)

numActives

public int numActives()

Description copied from interface: Vector

Number of active entries. An "active entry" is an element which is explicitly stored, regardless of its value. Note that inactive entries have value 0.

Specified by:

numActives in interface Vector

Returns:

(undocumented)

numNonzeros

public int numNonzeros()

Description copied from interface: Vector

Number of nonzero elements. This scans all active values and count nonzeros.

Specified by:

numNonzeros in interface Vector

Returns:

(undocumented)

argmax

public int argmax()

Description copied from interface: Vector

Find the index of a maximal element. Returns the first maximal element in case of a tie. Returns -1 if vector has length 0.

Specified by:

argmax in interface Vector

Returns:

(undocumented)