org.openimaj.data

Class DoubleArrayBackedDataSource

java.lang.Object

org.openimaj.data.DoubleArrayBackedDataSource

All Implemented Interfaces:

Iterable<double[]>, DataSource<double[]>

public class DoubleArrayBackedDataSource
extends Object
implements DataSource<double[]>

A DataSource backed by a 2D array of doubles.

Author:

Jonathon Hare (jsh2@ecs.soton.ac.uk)

Field Summary

Fields

Modifier and Type	Field and Description
protected double[][]	data
protected Random	rng

Constructor Summary

Constructors

Constructor and Description
DoubleArrayBackedDataSource(double[][] data) Construct with data
DoubleArrayBackedDataSource(double[][] data, Random rng) Construct with data and a random generator for random sampling

Method Summary

Methods

Modifier and Type	Method and Description
double[]	getData(int row) Get the data for a given row
void	getData(int startRow, int stopRow, double[][] output) Get data between given rows.
void	getRandomRows(double[][] output)
Iterator<double[]>	iterator()
int	numDimensions()
int	numRows()

Methods inherited from class java.lang.Object

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

Field Detail

data

protected double[][] data

rng

protected Random rng

Constructor Detail

DoubleArrayBackedDataSource

public DoubleArrayBackedDataSource(double[][] data)

Construct with data

Parameters:

data - the data

DoubleArrayBackedDataSource

public DoubleArrayBackedDataSource(double[][] data,
                           Random rng)

Construct with data and a random generator for random sampling

Parameters:

data - the data

rng - the random generator

Method Detail

getData

public final void getData(int startRow,
           int stopRow,
           double[][] output)

Description copied from interface: DataSource

Get data between given rows. startRow must be > 0, stopRow must be smaller than DataSource.numRows(). data is guaranteed to have (stopRow - startRow) valid entries

Specified by:

getData in interface DataSource<double[]>

Parameters:

startRow - where to start (inclusive)

stopRow - where to stop (exclusive)

output - the array to fill

getRandomRows

public final void getRandomRows(double[][] output)

Specified by:

getRandomRows in interface DataSource<double[]>

Parameters:

output - a random set of data. This array is guaranteed to be filled.

numDimensions

public int numDimensions()

Specified by:

numDimensions in interface DataSource<double[]>

Returns:

Number of dimensions of each data point

numRows

public int numRows()

Specified by:

numRows in interface DataSource<double[]>

Returns:

the number of data points

getData

public double[] getData(int row)

Description copied from interface: DataSource

Get the data for a given row

Specified by:

getData in interface DataSource<double[]>

Parameters:

row - the row number

Returns:

the data for the row

iterator

public Iterator<double[]> iterator()

Specified by:

iterator in interface Iterable<double[]>