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* 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,
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* See the License for the specific language governing permissions and
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package org.apache.commons.math.ode.events;
import junit.framework.Assert;
import org.apache.commons.math.ConvergenceException;
import org.apache.commons.math.ode.DerivativeException;
import org.apache.commons.math.ode.sampling.AbstractStepInterpolator;
import org.apache.commons.math.ode.sampling.DummyStepInterpolator;
import org.junit.Test;
public class EventStateTest {
// JIRA: MATH-322
@Test
public void closeEvents()
throws EventException, ConvergenceException, DerivativeException {
final double r1 = 90.0;
final double r2 = 135.0;
final double gap = r2 - r1;
EventHandler closeEventsGenerator = new EventHandler() {
public void resetState(double t, double[] y) {
}
public double g(double t, double[] y) {
return (t - r1) * (r2 - t);
}
public int eventOccurred(double t, double[] y, boolean increasing) {
return CONTINUE;
}
};
final double tolerance = 0.1;
EventState es = new EventState(closeEventsGenerator, 1.5 * gap, tolerance, 10);
double t0 = r1 - 0.5 * gap;
es.reinitializeBegin(t0, new double[0]);
AbstractStepInterpolator interpolator =
new DummyStepInterpolator(new double[0], new double[0], true);
interpolator.storeTime(t0);
interpolator.shift();
interpolator.storeTime(0.5 * (r1 + r2));
Assert.assertTrue(es.evaluateStep(interpolator));
Assert.assertEquals(r1, es.getEventTime(), tolerance);
es.stepAccepted(es.getEventTime(), new double[0]);
interpolator.shift();
interpolator.storeTime(r2 + 0.4 * gap);
Assert.assertTrue(es.evaluateStep(interpolator));
Assert.assertEquals(r2, es.getEventTime(), tolerance);
}
}