/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.math.ode.sampling;
import org.apache.commons.math.ode.DerivativeException;
import org.apache.commons.math.ode.FirstOrderIntegrator;
import org.apache.commons.math.ode.IntegratorException;
import org.apache.commons.math.ode.TestProblem3;
import org.apache.commons.math.ode.nonstiff.DormandPrince54Integrator;
import org.apache.commons.math.ode.sampling.FixedStepHandler;
import org.apache.commons.math.ode.sampling.StepNormalizer;
import junit.framework.*;
public class StepNormalizerTest
extends TestCase {
public StepNormalizerTest(String name) {
super(name);
pb = null;
integ = null;
}
public void testBoundaries()
throws DerivativeException, IntegratorException {
double range = pb.getFinalTime() - pb.getInitialTime();
setLastSeen(false);
integ.addStepHandler(new StepNormalizer(range / 10.0,
new FixedStepHandler() {
private static final long serialVersionUID = 1650337364641626444L;
private boolean firstCall = true;
public void handleStep(double t,
double[] y,
double[] yDot,
boolean isLast) {
if (firstCall) {
checkValue(t, pb.getInitialTime());
firstCall = false;
}
if (isLast) {
setLastSeen(true);
checkValue(t, pb.getFinalTime());
}
}
}));
integ.integrate(pb,
pb.getInitialTime(), pb.getInitialState(),
pb.getFinalTime(), new double[pb.getDimension()]);
assertTrue(lastSeen);
}
public void testBeforeEnd()
throws DerivativeException, IntegratorException {
final double range = pb.getFinalTime() - pb.getInitialTime();
setLastSeen(false);
integ.addStepHandler(new StepNormalizer(range / 10.5,
new FixedStepHandler() {
private static final long serialVersionUID = 2228457391561277298L;
public void handleStep(double t,
double[] y,
double[] yDot,
boolean isLast) {
if (isLast) {
setLastSeen(true);
checkValue(t,
pb.getFinalTime() - range / 21.0);
}
}
}));
integ.integrate(pb,
pb.getInitialTime(), pb.getInitialState(),
pb.getFinalTime(), new double[pb.getDimension()]);
assertTrue(lastSeen);
}
public void checkValue(double value, double reference) {
assertTrue(Math.abs(value - reference) < 1.0e-10);
}
public void setLastSeen(boolean lastSeen) {
this.lastSeen = lastSeen;
}
@Override
public void setUp() {
pb = new TestProblem3(0.9);
double minStep = 0;
double maxStep = pb.getFinalTime() - pb.getInitialTime();
integ = new DormandPrince54Integrator(minStep, maxStep, 10.e-8, 1.0e-8);
lastSeen = false;
}
@Override
public void tearDown() {
pb = null;
integ = null;
}
TestProblem3 pb;
FirstOrderIntegrator integ;
boolean lastSeen;
}