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TimeSeriesTranslate.java
Package: Weka-3-2.rar [view]
Upload User: rhdiban
Upload Date: 2013-08-09
Package Size: 15085k
Code Size: 5k
Category:
Windows Develop
Development Platform:
Java
- /*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- /*
- * TimeSeriesTranslate.java
- * Copyright (C) 1999 Len Trigg
- *
- */
- package weka.filters.unsupervised.attribute;
- import weka.filters.*;
- import java.io.*;
- import java.util.*;
- import weka.core.*;
- /**
- * An instance filter that assumes instances form time-series data and
- * replaces attribute values in the current instance with the equivalent
- * attribute attribute values of some previous (or future) instance. For
- * instances where the desired value is unknown either the instance may
- * be dropped, or missing values used.<p>
- *
- * Valid filter-specific options are:<p>
- *
- * -R index1,index2-index4,...<br>
- * Specify list of columns to calculate new values for.
- * First and last are valid indexes.
- * (default none)<p>
- *
- * -V <br>
- * Invert matching sense (i.e. calculate for all non-specified columns)<p>
- *
- * -I num <br>
- * The number of instances forward to translate values between.
- * A negative number indicates taking values from a past instance.
- * (default -1) <p>
- *
- * -M <br>
- * For instances at the beginning or end of the dataset where the translated
- * values are not known, use missing values (default is to remove those
- * instances). <p>
- *
- * @author Len Trigg (trigg@cs.waikato.ac.nz)
- * @version $Revision: 1.1 $
- */
- public class TimeSeriesTranslate extends AbstractTimeSeries {
- /**
- * Sets the format of the input instances.
- *
- * @param instanceInfo an Instances object containing the input instance
- * structure (any instances contained in the object are ignored - only the
- * structure is required).
- * @return true if the outputFormat may be collected immediately
- * @exception UnsupportedAttributeTypeException if selected
- * attributes are not numeric or nominal.
- */
- public boolean setInputFormat(Instances instanceInfo) throws Exception {
- super.setInputFormat(instanceInfo);
- // Create the output buffer
- Instances outputFormat = new Instances(instanceInfo, 0);
- for(int i = 0; i < instanceInfo.numAttributes(); i++) {
- if (m_SelectedCols.isInRange(i)) {
- if (outputFormat.attribute(i).isNominal()
- || outputFormat.attribute(i).isNumeric()) {
- outputFormat.renameAttribute(i, outputFormat.attribute(i).name()
- + (m_InstanceRange < 0 ? '-' : '+')
- + Math.abs(m_InstanceRange));
- } else {
- throw new UnsupportedAttributeTypeException("Only numeric and nominal attributes may be "
- + " manipulated in time series.");
- }
- }
- }
- setOutputFormat(outputFormat);
- return true;
- }
- /**
- * Creates a new instance the same as one instance (the "destination")
- * but with some attribute values copied from another instance
- * (the "source")
- *
- * @param source the source instance
- * @param dest the destination instance
- * @return the new merged instance
- */
- protected Instance mergeInstances(Instance source, Instance dest) {
- Instances outputFormat = outputFormatPeek();
- double[] vals = new double[outputFormat.numAttributes()];
- for(int i = 0; i < vals.length; i++) {
- if (m_SelectedCols.isInRange(i)) {
- if (source != null) {
- vals[i] = source.value(i);
- }
- } else {
- vals[i] = dest.value(i);
- }
- }
- Instance inst = null;
- if (dest instanceof SparseInstance) {
- inst = new SparseInstance(dest.weight(), vals);
- } else {
- inst = new Instance(dest.weight(), vals);
- }
- inst.setDataset(dest.dataset());
- return inst;
- }
- /**
- * Main method for testing this class.
- *
- * @param argv should contain arguments to the filter: use -h for help
- */
- public static void main(String [] argv) {
- try {
- if (Utils.getFlag('b', argv)) {
- Filter.batchFilterFile(new TimeSeriesTranslate(), argv);
- } else {
- Filter.filterFile(new TimeSeriesTranslate(), argv);
- }
- } catch (Exception ex) {
- System.out.println(ex.getMessage());
- }
- }
- }