/*
* 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.
*/
/*
* Copyright (C) 2005 University of Waikato, Hamilton, New Zealand
*/
package weka.filters.unsupervised.attribute;
import weka.core.Instances;
import weka.core.SparseInstance;
import weka.core.Utils;
import weka.filters.AbstractFilterTest;
import weka.filters.Filter;
import junit.framework.Test;
import junit.framework.TestSuite;
/**
* Tests MathExpression. Run from the command line with: <p/>
* java weka.filters.unsupervised.attribute.MathExpressionTest
*
* @author FracPete (fracpete at waikato dot ac dot nz)
* @version $Revision: 1.2 $
*/
public class MathExpressionTest
extends AbstractFilterTest {
/** the attribute to work on */
protected int m_AttIndex = 2;
public MathExpressionTest(String name) {
super(name);
}
/** Creates a MathExpression with the default expression */
public Filter getFilter() {
return getFilter(new MathExpression().getExpression());
}
/** Creates a MathExpression filter with the given expression */
protected Filter getFilter(String expression) {
MathExpression f = new MathExpression();
f.setExpression(expression);
f.setIgnoreRange("" + (m_AttIndex + 1));
f.setInvertSelection(true);
return f;
}
public void testTypical() {
m_Filter = getFilter();
Instances result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals(m_Instances.numInstances(), result.numInstances());
}
/**
* checks a certain statistic
* @param expr the filter expression
* @param stats the value of the corresponding attribute statistics
*/
protected void checkStatistics(String expr, double stats) {
m_Filter = getFilter(expr);
Instances result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals(m_Instances.numInstances(), result.numInstances());
// check statistics
boolean equal = true;
for (int i = 0; i < result.numInstances(); i++) {
if (!Utils.eq(stats, result.instance(i).value(m_AttIndex))) {
equal = false;
break;
}
}
if (!equal)
fail("Filter and Attribute statistics differ ('" + expr + "')!");
}
/**
* checks the statistics of the attribute
*/
public void testStats() {
checkStatistics(
"MIN", m_Instances.attributeStats(m_AttIndex).numericStats.min);
checkStatistics(
"MAX", m_Instances.attributeStats(m_AttIndex).numericStats.max);
checkStatistics(
"MEAN", m_Instances.attributeStats(m_AttIndex).numericStats.mean);
checkStatistics(
"SD", m_Instances.attributeStats(m_AttIndex).numericStats.stdDev);
checkStatistics(
"COUNT", m_Instances.attributeStats(m_AttIndex).numericStats.count);
checkStatistics(
"SUM", m_Instances.attributeStats(m_AttIndex).numericStats.sum);
checkStatistics(
"SUMSQUARED", m_Instances.attributeStats(m_AttIndex).numericStats.sumSq);
}
/**
* checks whether attribute value stays the same
*/
public void testEquality() {
m_Filter = getFilter("A");
Instances result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals(m_Instances.numInstances(), result.numInstances());
// check equality
boolean equal = true;
for (int i = 0; i < result.numInstances(); i++) {
if (m_Instances.instance(i) instanceof SparseInstance)
continue;
if (!Utils.eq(
m_Instances.instance(i).value(m_AttIndex),
result.instance(i).value(m_AttIndex))) {
equal = false;
break;
}
}
if (!equal)
fail("Filter modifies attribute values)!");
}
public void testAbs() {
m_Filter = getFilter("abs(A)");
Instances result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals(m_Instances.numInstances(), result.numInstances());
// check equality
boolean equal = true;
for (int i = 0; i < result.numInstances(); i++) {
if (m_Instances.instance(i) instanceof SparseInstance)
continue;
if (!Utils.eq(
Math.abs(m_Instances.instance(i).value(m_AttIndex)),
result.instance(i).value(m_AttIndex))) {
equal = false;
break;
}
}
if (!equal)
fail("Filter produces different result)!");
}
public void testsqrt() {
m_Filter = getFilter("sqrt(A)");
Instances result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals(m_Instances.numInstances(), result.numInstances());
// check equality
boolean equal = true;
for (int i = 0; i < result.numInstances(); i++) {
if (m_Instances.instance(i) instanceof SparseInstance)
continue;
if (!Utils.eq(
Math.sqrt(m_Instances.instance(i).value(m_AttIndex)),
result.instance(i).value(m_AttIndex))) {
equal = false;
break;
}
}
if (!equal)
fail("Filter produces different result)!");
}
public void testLog() {
m_Filter = getFilter("log(A)");
Instances result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals(m_Instances.numInstances(), result.numInstances());
// check equality
boolean equal = true;
for (int i = 0; i < result.numInstances(); i++) {
if (m_Instances.instance(i) instanceof SparseInstance)
continue;
if (!Utils.eq(
Math.log(m_Instances.instance(i).value(m_AttIndex)),
result.instance(i).value(m_AttIndex))) {
equal = false;
break;
}
}
if (!equal)
fail("Filter produces different result)!");
}
public void testExp() {
m_Filter = getFilter("exp(A)");
Instances result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals(m_Instances.numInstances(), result.numInstances());
// check equality
boolean equal = true;
for (int i = 0; i < result.numInstances(); i++) {
if (m_Instances.instance(i) instanceof SparseInstance)
continue;
if (!Utils.eq(
Math.exp(m_Instances.instance(i).value(m_AttIndex)),
result.instance(i).value(m_AttIndex))) {
equal = false;
break;
}
}
if (!equal)
fail("Filter produces different result)!");
}
public void testSin() {
m_Filter = getFilter("sin(A)");
Instances result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals(m_Instances.numInstances(), result.numInstances());
// check equality
boolean equal = true;
for (int i = 0; i < result.numInstances(); i++) {
if (m_Instances.instance(i) instanceof SparseInstance)
continue;
if (!Utils.eq(
Math.sin(m_Instances.instance(i).value(m_AttIndex)),
result.instance(i).value(m_AttIndex))) {
equal = false;
break;
}
}
if (!equal)
fail("Filter produces different result)!");
}
public void testCos() {
m_Filter = getFilter("cos(A)");
Instances result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals(m_Instances.numInstances(), result.numInstances());
// check equality
boolean equal = true;
for (int i = 0; i < result.numInstances(); i++) {
if (m_Instances.instance(i) instanceof SparseInstance)
continue;
if (!Utils.eq(
Math.cos(m_Instances.instance(i).value(m_AttIndex)),
result.instance(i).value(m_AttIndex))) {
equal = false;
break;
}
}
if (!equal)
fail("Filter produces different result)!");
}
public void testTan() {
m_Filter = getFilter("tan(A)");
Instances result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals(m_Instances.numInstances(), result.numInstances());
// check equality
boolean equal = true;
for (int i = 0; i < result.numInstances(); i++) {
if (m_Instances.instance(i) instanceof SparseInstance)
continue;
if (!Utils.eq(
Math.tan(m_Instances.instance(i).value(m_AttIndex)),
result.instance(i).value(m_AttIndex))) {
equal = false;
break;
}
}
if (!equal)
fail("Filter produces different result)!");
}
public void testRint() {
m_Filter = getFilter("rint(A)");
Instances result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals(m_Instances.numInstances(), result.numInstances());
// check equality
boolean equal = true;
for (int i = 0; i < result.numInstances(); i++) {
if (m_Instances.instance(i) instanceof SparseInstance)
continue;
if (!Utils.eq(
Math.rint(m_Instances.instance(i).value(m_AttIndex)),
result.instance(i).value(m_AttIndex))) {
equal = false;
break;
}
}
if (!equal)
fail("Filter produces different result)!");
}
public void testFloor() {
m_Filter = getFilter("floor(A)");
Instances result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals(m_Instances.numInstances(), result.numInstances());
// check equality
boolean equal = true;
for (int i = 0; i < result.numInstances(); i++) {
if (m_Instances.instance(i) instanceof SparseInstance)
continue;
if (!Utils.eq(
Math.floor(m_Instances.instance(i).value(m_AttIndex)),
result.instance(i).value(m_AttIndex))) {
equal = false;
break;
}
}
if (!equal)
fail("Filter produces different result)!");
}
public void testPow2() {
m_Filter = getFilter("pow(A,2)");
Instances result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals(m_Instances.numInstances(), result.numInstances());
// check equality
boolean equal = true;
for (int i = 0; i < result.numInstances(); i++) {
if (m_Instances.instance(i) instanceof SparseInstance)
continue;
if (!Utils.eq(
Math.pow(m_Instances.instance(i).value(m_AttIndex), 2),
result.instance(i).value(m_AttIndex))) {
equal = false;
break;
}
}
if (!equal)
fail("Filter produces different result)!");
}
public void testCeil() {
m_Filter = getFilter("ceil(A)");
Instances result = useFilter();
assertEquals(m_Instances.numAttributes(), result.numAttributes());
assertEquals(m_Instances.numInstances(), result.numInstances());
// check equality
boolean equal = true;
for (int i = 0; i < result.numInstances(); i++) {
if (m_Instances.instance(i) instanceof SparseInstance)
continue;
if (!Utils.eq(
Math.ceil(m_Instances.instance(i).value(m_AttIndex)),
result.instance(i).value(m_AttIndex))) {
equal = false;
break;
}
}
if (!equal)
fail("Filter produces different result)!");
}
public static Test suite() {
return new TestSuite(MathExpressionTest.class);
}
public static void main(String[] args){
junit.textui.TestRunner.run(suite());
}
}