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Java example source code file (StepNormalizerTest.java)

This example Java source code file (StepNormalizerTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

after, before, dimensionmismatchexception, dormandprince54integrator, firstorderintegrator, fixedstephandler, maxcountexceededexception, nobracketingexception, numberistoosmallexception, stepnormalizer, stepnormalizertest, test, testproblem3

The StepNormalizerTest.java Java example source code

/*
 * 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.math3.ode.sampling;

import org.apache.commons.math3.exception.DimensionMismatchException;
import org.apache.commons.math3.exception.MaxCountExceededException;
import org.apache.commons.math3.exception.NoBracketingException;
import org.apache.commons.math3.exception.NumberIsTooSmallException;
import org.apache.commons.math3.ode.FirstOrderIntegrator;
import org.apache.commons.math3.ode.TestProblem3;
import org.apache.commons.math3.ode.nonstiff.DormandPrince54Integrator;
import org.apache.commons.math3.util.FastMath;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;


public class StepNormalizerTest {

  public StepNormalizerTest() {
    pb    = null;
    integ = null;
  }

  @Test
  public void testBoundaries()
      throws DimensionMismatchException, NumberIsTooSmallException,
             MaxCountExceededException, NoBracketingException {
    double range = pb.getFinalTime() - pb.getInitialTime();
    setLastSeen(false);
    integ.addStepHandler(new StepNormalizer(range / 10.0,
                                       new FixedStepHandler() {
                                         private boolean firstCall = true;
                                         public void init(double t0, double[] y0, double t) {
                                         }
                                         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()]);
    Assert.assertTrue(lastSeen);
  }

  @Test
  public void testBeforeEnd()
      throws DimensionMismatchException, NumberIsTooSmallException,
             MaxCountExceededException, NoBracketingException {
    final double range = pb.getFinalTime() - pb.getInitialTime();
    setLastSeen(false);
    integ.addStepHandler(new StepNormalizer(range / 10.5,
                                       new FixedStepHandler() {
                                         public void init(double t0, double[] y0, double t) {
                                         }
                                         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()]);
    Assert.assertTrue(lastSeen);
  }

  public void checkValue(double value, double reference) {
    Assert.assertTrue(FastMath.abs(value - reference) < 1.0e-10);
  }

  public void setLastSeen(boolean lastSeen) {
    this.lastSeen = lastSeen;
  }

  @Before
  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;
  }

  @After
  public void tearDown() {
    pb    = null;
    integ = null;
  }

  TestProblem3 pb;
  FirstOrderIntegrator integ;
  boolean lastSeen;

}

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