org.apache.spark.ml.linalg

Class Vectors

Object

org.apache.spark.ml.linalg.Vectors

public class Vectors
extends Object

Factory methods for Vector. We don't use the name Vector because Scala imports scala.collection.immutable.Vector by default.

Constructor Summary

Constructors

Constructor and Description
Vectors()

Method Summary

Modifier and Type	Method and Description
static Vector	dense(double[] values) Creates a dense vector from a double array.
static Vector	dense(double firstValue, double... otherValues) Creates a dense vector from its values.
static Vector	dense(double firstValue, scala.collection.Seq<Object> otherValues) Creates a dense vector from its values.
static double	norm(Vector vector, double p) Returns the p-norm of this vector.
static Vector	sparse(int size, int[] indices, double[] values) Creates a sparse vector providing its index array and value array.
static Vector	sparse(int size, Iterable<scala.Tuple2<Integer,Double>> elements) Creates a sparse vector using unordered (index, value) pairs in a Java friendly way.
static Vector	sparse(int size, scala.collection.Seq<scala.Tuple2<Object,Object>> elements) Creates a sparse vector using unordered (index, value) pairs.
static double	sqdist(Vector v1, Vector v2) Returns the squared distance between two Vectors.
static Vector	zeros(int size) Creates a vector of all zeros.

Methods inherited from class Object

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

Constructor Detail

Vectors

public Vectors()

Method Detail

dense

public static Vector dense(double firstValue,
                           double... otherValues)

Creates a dense vector from its values.

Parameters:

firstValue - (undocumented)

otherValues - (undocumented)

Returns:

(undocumented)

dense

public static Vector dense(double firstValue,
                           scala.collection.Seq<Object> otherValues)

Creates a dense vector from its values.

Parameters:

firstValue - (undocumented)

otherValues - (undocumented)

Returns:

(undocumented)

dense

public static Vector dense(double[] values)

Creates a dense vector from a double array.

Parameters:

values - (undocumented)

Returns:

(undocumented)

sparse

public static Vector sparse(int size,
                            int[] indices,
                            double[] values)

Creates a sparse vector providing its index array and value array.

Parameters:

size - vector size.

indices - index array, must be strictly increasing.

values - value array, must have the same length as indices.

Returns:

(undocumented)

sparse

public static Vector sparse(int size,
                            scala.collection.Seq<scala.Tuple2<Object,Object>> elements)

Creates a sparse vector using unordered (index, value) pairs.

Parameters:

size - vector size.

elements - vector elements in (index, value) pairs.

Returns:

(undocumented)

sparse

public static Vector sparse(int size,
                            Iterable<scala.Tuple2<Integer,Double>> elements)

Creates a sparse vector using unordered (index, value) pairs in a Java friendly way.

Parameters:

size - vector size.

elements - vector elements in (index, value) pairs.

Returns:

(undocumented)

zeros

public static Vector zeros(int size)

Creates a vector of all zeros.

Parameters:

size - vector size

Returns:

a zero vector

norm

public static double norm(Vector vector,
                          double p)

Returns the p-norm of this vector.

Parameters:

vector - input vector.

p - norm.

Returns:

norm in L^p^ space.

sqdist

public static double sqdist(Vector v1,
                            Vector v2)

Returns the squared distance between two Vectors.

Parameters:

v1 - first Vector.

v2 - second Vector.

Returns:

squared distance between two Vectors.