/*
* 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) 2002 University of Waikato
*/
package weka.filters.unsupervised.attribute;
import weka.core.Instance;
import weka.core.Instances;
import weka.filters.AbstractFilterTest;
import weka.filters.Filter;
import junit.framework.Test;
import junit.framework.TestSuite;
/**
* Tests AddExpression. Run from the command line with:<p>
* java weka.filters.unsupervised.attribute.AddExpressionTest
*
* @author <a href="mailto:len@reeltwo.com">Len Trigg</a>
* @version $Revision: 1.3 $
*/
public class AddExpressionTest extends AbstractFilterTest {
private static double EXPR_DELTA = 0.001;
public AddExpressionTest(String name) { super(name); }
/** Creates a default AddExpression */
public Filter getFilter() {
return new AddExpression();
}
/** Creates a specialized AddExpression */
public Filter getFilter(String expr) {
AddExpression af = new AddExpression();
af.setExpression(expr);
return af;
}
public void testAdd() {
m_Filter = getFilter("a1+a2");
Instances result = useFilter();
for (int i = 0; i < result.numInstances(); i++) {
Instance inst = result.instance(i);
assertEquals("Instance " + (i + 1),
inst.value(0) + inst.value(1),
inst.value(inst.numAttributes() - 1), EXPR_DELTA);
}
}
public void testSubtract() {
m_Filter = getFilter("a1-a2");
Instances result = useFilter();
for (int i = 0; i < result.numInstances(); i++) {
Instance inst = result.instance(i);
assertEquals("Instance " + (i + 1),
inst.value(0) - inst.value(1),
inst.value(inst.numAttributes() - 1), EXPR_DELTA);
}
}
public void testMultiply() {
m_Filter = getFilter("a1*a2");
Instances result = useFilter();
for (int i = 0; i < result.numInstances(); i++) {
Instance inst = result.instance(i);
assertEquals("Instance " + (i + 1),
inst.value(0) * inst.value(1),
inst.value(inst.numAttributes() - 1), EXPR_DELTA);
}
}
public void testDivide() {
m_Filter = getFilter("a1/a2");
Instances result = useFilter();
for (int i = 0; i < result.numInstances(); i++) {
Instance inst = result.instance(i);
if (inst.value(1) == 0) {
assertTrue("Instance " + (i + 1) + " should have been ?" ,
inst.isMissing(inst.numAttributes() - 1));
} else {
assertEquals("Instance " + (i + 1),
inst.value(0) / inst.value(1),
inst.value(inst.numAttributes() - 1), EXPR_DELTA);
}
}
}
public void testExponent() {
m_Filter = getFilter("a1^a2");
Instances result = useFilter();
for (int i = 0; i < result.numInstances(); i++) {
Instance inst = result.instance(i);
assertEquals("Instance " + (i + 1),
Math.pow(inst.value(0), inst.value(1)),
inst.value(inst.numAttributes() - 1), EXPR_DELTA);
}
}
public void testLog() {
m_Filter = getFilter("log(a2/5)");
Instances result = useFilter();
for (int i = 0; i < result.numInstances(); i++) {
Instance inst = result.instance(i);
if (inst.value(1) != 0) {
assertEquals("Instance " + (i + 1),
Math.log(inst.value(1)/5),
inst.value(inst.numAttributes() - 1), EXPR_DELTA);
}
}
}
public void testCos() {
m_Filter = getFilter("cos(a2/5)");
Instances result = useFilter();
for (int i = 0; i < result.numInstances(); i++) {
Instance inst = result.instance(i);
assertEquals("Instance " + (i + 1),
Math.cos(inst.value(1) / 5),
inst.value(inst.numAttributes() - 1), EXPR_DELTA);
}
}
public void testSin() {
m_Filter = getFilter("sin(a2/5)");
Instances result = useFilter();
for (int i = 0; i < result.numInstances(); i++) {
Instance inst = result.instance(i);
assertEquals("Instance " + (i + 1),
Math.sin(inst.value(1) / 5),
inst.value(inst.numAttributes() - 1), EXPR_DELTA);
}
}
public void testTan() {
m_Filter = getFilter("tan(a2/5)");
Instances result = useFilter();
for (int i = 0; i < result.numInstances(); i++) {
Instance inst = result.instance(i);
assertEquals("Instance " + (i + 1) + ": " + inst + "\n",
Math.tan(inst.value(1) / 5),
inst.value(inst.numAttributes() - 1), EXPR_DELTA);
}
}
public void testAbs() {
m_Filter = getFilter("abs(a2-a1)");
Instances result = useFilter();
for (int i = 0; i < result.numInstances(); i++) {
Instance inst = result.instance(i);
assertEquals("Instance " + (i + 1),
Math.abs(inst.value(1) - inst.value(0)),
inst.value(inst.numAttributes() - 1), EXPR_DELTA);
}
}
public void testExp() {
m_Filter = getFilter("exp(a2-a1)");
Instances result = useFilter();
for (int i = 0; i < result.numInstances(); i++) {
Instance inst = result.instance(i);
assertEquals("Instance " + (i + 1),
Math.exp(inst.value(1) - inst.value(0)),
inst.value(inst.numAttributes() - 1), EXPR_DELTA);
}
}
public void testSqrt() {
m_Filter = getFilter("sqrt(a2+a1/5)");
Instances result = useFilter();
for (int i = 0; i < result.numInstances(); i++) {
Instance inst = result.instance(i);
assertEquals("Instance " + (i + 1),
Math.sqrt(inst.value(1) + inst.value(0)/5),
inst.value(inst.numAttributes() - 1), EXPR_DELTA);
}
}
public void testFloor() {
m_Filter = getFilter("floor(a2+a1/5)");
Instances result = useFilter();
for (int i = 0; i < result.numInstances(); i++) {
Instance inst = result.instance(i);
assertEquals("Instance " + (i + 1),
Math.floor(inst.value(1) + inst.value(0)/5),
inst.value(inst.numAttributes() - 1), EXPR_DELTA);
}
}
public void testCeil() {
m_Filter = getFilter("ceil(a2*a1/5)");
Instances result = useFilter();
for (int i = 0; i < result.numInstances(); i++) {
Instance inst = result.instance(i);
assertEquals("Instance " + (i + 1),
Math.ceil(inst.value(1) * inst.value(0)/5),
inst.value(inst.numAttributes() - 1), EXPR_DELTA);
}
}
public void testRint() {
m_Filter = getFilter("rint(a2*a1/5)");
Instances result = useFilter();
for (int i = 0; i < result.numInstances(); i++) {
Instance inst = result.instance(i);
assertEquals("Instance " + (i + 1),
Math.rint(inst.value(1) * inst.value(0)/5),
inst.value(inst.numAttributes() - 1), EXPR_DELTA);
}
}
public void testBracketing() {
m_Filter = getFilter("(a3+a4)*((a2-a1)/5)");
Instances result = useFilter();
for (int i = 0; i < result.numInstances(); i++) {
Instance inst = result.instance(i);
if (inst.isMissing(0) || inst.isMissing(1) ||
inst.isMissing(2) || inst.isMissing(3)) {
assertTrue("Instance " + (i + 1) + " should have been ?" ,
inst.isMissing(inst.numAttributes() - 1));
} else {
assertEquals("Instance " + (i + 1),
(inst.value(3) + inst.value(2)) *
((inst.value(1) - inst.value(0))/5),
inst.value(inst.numAttributes() - 1), EXPR_DELTA);
}
}
}
public void testBODMAS() {
m_Filter = getFilter("a3+a4*a2-a1/5+a3*a4+a2");
Instances result = useFilter();
for (int i = 0; i < result.numInstances(); i++) {
Instance inst = result.instance(i);
if (inst.isMissing(0) || inst.isMissing(1) ||
inst.isMissing(2) || inst.isMissing(3)) {
assertTrue("Instance " + (i + 1) + " should have been ?" ,
inst.isMissing(inst.numAttributes() - 1));
} else {
assertEquals("Instance " + (i + 1),
inst.value(2) +
(inst.value(3) * inst.value(1))
- (inst.value(0)/5)
+ (inst.value(3) * inst.value(2))
+ inst.value(1),
inst.value(inst.numAttributes() - 1), EXPR_DELTA);
}
}
}
public void testAddNamed() {
m_Filter = getFilter("a1+a2");
String name = "BongoBongo";
((AddExpression)m_Filter).setName(name);
Instances result = useFilter();
assertEquals(name, result.attribute(result.numAttributes() - 1).name());
name = "BongoBongoSecond";
((AddExpression)m_Filter).setName(name);
result = useFilter();
assertEquals(name, result.attribute(result.numAttributes() - 1).name());
}
public static Test suite() {
return new TestSuite(AddExpressionTest.class);
}
public static void main(String[] args){
junit.textui.TestRunner.run(suite());
}
}