org.apache.spark.mllib.linalg

Class DenseMatrix

Object

org.apache.spark.mllib.linalg.DenseMatrix

All Implemented Interfaces:

java.io.Serializable, Matrix

public class DenseMatrix
extends Object
implements Matrix

Column-major dense matrix. The entry values are stored in a single array of doubles with columns listed in sequence. For example, the following matrix

   1.0 2.0
   3.0 4.0
   5.0 6.0
 

is stored as [1.0, 3.0, 5.0, 2.0, 4.0, 6.0].

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
DenseMatrix(int numRows, int numCols, double[] values)

Method Summary

Methods

Modifier and Type	Method and Description
double	apply(int i)
double	apply(int i, int j) Gets the (i, j)-th element.
DenseMatrix	copy() Get a deep copy of the matrix.
boolean	equals(Object o)
int	index(int i, int j) Return the index for the (i, j)-th element in the backing array.
int	numCols() Number of columns.
int	numRows() Number of rows.
double[]	toArray() Converts to a dense array in column major.
breeze.linalg.Matrix<Object>	toBreeze() Converts to a breeze matrix.
void	update(int i, int j, double v) Update element at (i, j)
double[]	values()

Methods inherited from class Object

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

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

multiply, multiply, toString, transposeMultiply, transposeMultiply

Constructor Detail

DenseMatrix

public DenseMatrix(int numRows,
           int numCols,
           double[] values)

Method Detail

numRows

public int numRows()

Description copied from interface: Matrix

Number of rows.

Specified by:

numRows in interface Matrix

numCols

public int numCols()

Description copied from interface: Matrix

Number of columns.

Specified by:

numCols in interface Matrix

values

public double[] values()

toArray

public double[] toArray()

Description copied from interface: Matrix

Converts to a dense array in column major.

Specified by:

toArray in interface Matrix

equals

public boolean equals(Object o)

Overrides:

equals in class Object

toBreeze

public breeze.linalg.Matrix<Object> toBreeze()

Description copied from interface: Matrix

Converts to a breeze matrix.

Specified by:

toBreeze in interface Matrix

apply

public double apply(int i)

apply

public double apply(int i,
           int j)

Description copied from interface: Matrix

Gets the (i, j)-th element.

Specified by:

apply in interface Matrix

index

public int index(int i,
        int j)

Description copied from interface: Matrix

Return the index for the (i, j)-th element in the backing array.

Specified by:

index in interface Matrix

update

public void update(int i,
          int j,
          double v)

Description copied from interface: Matrix

Update element at (i, j)

Specified by:

update in interface Matrix

copy

public DenseMatrix copy()

Description copied from interface: Matrix

Get a deep copy of the matrix.

Specified by:

copy in interface Matrix