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Java example source code file (TestProblemAbstract.java)

This example Java source code file (TestProblemAbstract.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

eventhandler, firstorderdifferentialequations, testproblemabstract

The TestProblemAbstract.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;

import org.apache.commons.math3.ode.FirstOrderDifferentialEquations;
import org.apache.commons.math3.ode.events.EventHandler;

/**
 * This class is used as the base class of the problems that are
 * integrated during the junit tests for the ODE integrators.
 */
public abstract class TestProblemAbstract
  implements FirstOrderDifferentialEquations {

  /** Dimension of the problem. */
  private int n;

  /** Number of functions calls. */
  private int calls;

  /** Initial time */
  private double t0;

  /** Initial state */
  private double[] y0;

  /** Final time */
  private double t1;

  /** Error scale */
  private double[] errorScale;

  /**
   * Simple constructor.
   */
  protected TestProblemAbstract() {
    n          = 0;
    calls      = 0;
    t0         = 0;
    y0         = null;
    t1         = 0;
    errorScale = null;
  }

  /**
   * Set the initial conditions
   * @param t0 initial time
   * @param y0 initial state vector
   */
  protected void setInitialConditions(double t0, double[] y0) {
    calls     = 0;
    n         = y0.length;
    this.t0   = t0;
    this.y0   = y0.clone();
   }

  /**
   * Set the final conditions.
   * @param t1 final time
   */
  protected void setFinalConditions(double t1) {
    this.t1 = t1;
  }

  /**
   * Set the error scale
   * @param errorScale error scale
   */
  protected void setErrorScale(double[] errorScale) {
    this.errorScale = errorScale.clone();
  }

  public int getDimension() {
    return n;
  }

  /**
   * Get the initial time.
   * @return initial time
   */
  public double getInitialTime() {
    return t0;
  }

  /**
   * Get the initial state vector.
   * @return initial state vector
   */
  public double[] getInitialState() {
    return y0;
  }

  /**
   * Get the final time.
   * @return final time
   */
  public double getFinalTime() {
    return t1;
  }

  /**
   * Get the error scale.
   * @return error scale
   */
  public double[] getErrorScale() {
    return errorScale;
  }

  /**
   * Get the events handlers.
   * @return events handlers   */
  public EventHandler[] getEventsHandlers() {
    return new EventHandler[0];
  }

  /**
   * Get the theoretical events times.
   * @return theoretical events times
   */
  public double[] getTheoreticalEventsTimes() {
      return new double[0];
  }

  /**
   * Get the number of calls.
   * @return nuber of calls
   */
  public int getCalls() {
    return calls;
  }

  public void computeDerivatives(double t, double[] y, double[] yDot) {
    ++calls;
    doComputeDerivatives(t, y, yDot);
  }

  abstract public void doComputeDerivatives(double t, double[] y, double[] yDot);

  /**
   * Compute the theoretical state at the specified time.
   * @param t time at which the state is required
   * @return state vector at time t
   */
  abstract public double[] computeTheoreticalState(double t);

}

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