saaps.ann
Class TimeSeriesToDataMap

java.lang.Object
  |
  +--saaps.ann.TimeSeriesToDataMap

public class TimeSeriesToDataMap

extends java.lang.Object

The TimeSeriesToDataMap is used to convert a TimeSeries object into a Data object to be used as input to a neural network. Two things are made with the mapper: normalization and transformation.

The mapping information is given in two integer arrays connecting the elements in the TimeSeries object to the Data object.

The first array, the time array, describes the time delay or time shifts. The second array, the field array, describes what data field should be used. The lengths of time and field must be the same. The number of connections (inputs) of the resulting Data object will equal the length of time (and field). The number of examples in the Data object will equal the number of examples in the TimeSeries object minus the length of time plus one.

The easiest way to determine time and field is to consider what the first example in the Data object should be. Suppose that the first three observations of data fields 2 and 3 of the TimeSeries object should make up the first example in the Data object. Then we will have time=[0,1,2,0,1,2] and field=[2,2,2,3,3,3]. The same mapping is then shifted one time step at a time through the TimeSeries object to generate new examples in the Data object.

Constructor Summary

TimeSeriesToDataMap()
Creates new TimeSeriesToDataMap

TimeSeriesToDataMap(int[] times, int[] fields)
Create the mapping object from two integer arrays of the same length.

Method Summary

Data	convert(TimeSeries ts) Convert the TimeSeries object into a Data object according to the specified mapping.

Methods inherited from class java.lang.Object

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

Constructor Detail

TimeSeriesToDataMap

public TimeSeriesToDataMap()

Creates new TimeSeriesToDataMap

TimeSeriesToDataMap

public TimeSeriesToDataMap(int[] times,
                           int[] fields)

Create the mapping object from two integer arrays of the same length.

Parameters:

times - The time mapping

fields - The data field mapping

Method Detail

convert

public Data convert(TimeSeries ts)

Convert the TimeSeries object into a Data object according to the specified mapping.

Parameters:

ts - The time series to be converted

Returns:

The Data object