org.apache.spark.mllib.linalg

Class DenseVector

java.lang.Object

org.apache.spark.mllib.linalg.DenseVector

All Implemented Interfaces:

java.io.Serializable, Vector

public class DenseVector
extends java.lang.Object
implements Vector

A dense vector represented by a value array.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
DenseVector(double[] values)

Method Summary

Methods

Modifier and Type	Method and 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.
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.
SparseVector	toSparse() Converts this vector to a sparse vector with all explicit zeros removed.
java.lang.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

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

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

compressed, equals, toDense

Constructor Detail

DenseVector

public DenseVector(double[] values)

Method Detail

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 java.lang.String toString()

Overrides:

toString in class java.lang.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)

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 nonzeros in the first 16 entries, using a hash algorithm similar to java.util.Arrays.hashCode.

Specified by:

hashCode in interface Vector

Overrides:

hashCode in class java.lang.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)

toSparse

public SparseVector toSparse()

Description copied from interface: Vector

Converts this vector to a sparse vector with all explicit zeros removed.

Specified by:

toSparse 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)