Examples of org.apache.commons.math3.ode.FirstOrderIntegrator.addEventHandler()

Class org.apache.commons.math3.ode.FirstOrderIntegrator

Examples of org.apache.commons.math3.ode.FirstOrderIntegrator.addEventHandler()

org.apache.commons.math3.ode.FirstOrderIntegrator.addEventHandler()
Add an event handler to the integrator. Uses a default {@link UnivariateSolver}with an absolute accuracy equal to the given convergence threshold, as root-finding algorithm to detect the state events. @param handler event handler @param maxCheckInterval maximal time interval between switchingfunction checks (this interval prevents missing sign changes in case the integration steps becomes very large) @param convergence convergence threshold in the event time search @param maxIterationCount upper limit of the iteration count inthe event time search @see #getEventHandlers() @see #clearEventHandlers()

        FirstOrderIntegrator integ = new ClassicalRungeKuttaIntegrator(step);
        TestProblemHandler handler = new TestProblemHandler(pb, integ);
        integ.addStepHandler(handler);
        EventHandler[] functions = pb.getEventsHandlers();
        for (int l = 0; l < functions.length; ++l) {
          integ.addEventHandler(functions[l],
                                     Double.POSITIVE_INFINITY, 1.0e-6 * step, 1000);
        }
        Assert.assertEquals(functions.length, integ.getEventHandlers().size());
        double stopTime = integ.integrate(pb, pb.getInitialTime(), pb.getInitialState(),
                                          pb.getFinalTime(), new double[pb.getDimension()]);

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        FirstOrderIntegrator integrator;
        integrator = (integratorType == 1)
                     ? new DormandPrince853Integrator(e, 100.0, 1e-7, 1e-7)
                     : new GraggBulirschStoerIntegrator(e, 100.0, 1e-7, 1e-7);
        PegasusSolver rootSolver = new PegasusSolver(e, e);
        integrator.addEventHandler(new Event(), 0.1, e, 1000, rootSolver);
        double t0 = 6.0;
        double tEnd = 10.0;
        double[] y = {2.0, 2.0, 2.0, 4.0, 2.0, 7.0, 15.0};
        return integrator.integrate(new Ode(), t0, y, tEnd, y);
    }

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                FirstOrderIntegrator integ = new LutherIntegrator(step);
                TestProblemHandler handler = new TestProblemHandler(pb, integ);
                integ.addStepHandler(handler);
                EventHandler[] functions = pb.getEventsHandlers();
                for (int l = 0; l < functions.length; ++l) {
                    integ.addEventHandler(functions[l],
                                          Double.POSITIVE_INFINITY, 1.0e-6 * step, 1000);
                }
                Assert.assertEquals(functions.length, integ.getEventHandlers().size());
                double stopTime = integ.integrate(pb, pb.getInitialTime(), pb.getInitialState(),
                                                  pb.getFinalTime(), new double[pb.getDimension()]);

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      throws DimensionMismatchException, NumberIsTooSmallException,
             MaxCountExceededException, NoBracketingException {
    final StepProblem stepProblem = new StepProblem(0.0, 1.0, 2.0);
    FirstOrderIntegrator integ =
      new DormandPrince853Integrator(0.1, 10, 1.0e-12, 0.0);
    integ.addEventHandler(stepProblem, 1.0, 1.0e-12, 1000);
    double[] y = { Double.NaN };
    integ.integrate(stepProblem, 0.0, new double[] { 0.0 }, 10.0, y);
    Assert.assertEquals(8.0, y[0], 1.0e-12);
  }

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      SchedulingChecker sinChecker = new SchedulingChecker(0); // events at 0, PI, 2PI ...
      SchedulingChecker cosChecker = new SchedulingChecker(1); // events at PI/2, 3PI/2, 5PI/2 ...


      FirstOrderIntegrator integ =
              new DormandPrince853Integrator(0.001, 1.0, 1.0e-12, 0.0);
      integ.addEventHandler(sinChecker, 0.01, 1.0e-7, 100);
      integ.addStepHandler(sinChecker);
      integ.addEventHandler(cosChecker, 0.01, 1.0e-7, 100);
      integ.addStepHandler(cosChecker);
      double   t0 = 0.5;
      double[] y0 = new double[] { FastMath.sin(t0), FastMath.cos(t0) };

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      FirstOrderIntegrator integ =
              new DormandPrince853Integrator(0.001, 1.0, 1.0e-12, 0.0);
      integ.addEventHandler(sinChecker, 0.01, 1.0e-7, 100);
      integ.addStepHandler(sinChecker);
      integ.addEventHandler(cosChecker, 0.01, 1.0e-7, 100);
      integ.addStepHandler(cosChecker);
      double   t0 = 0.5;
      double[] y0 = new double[] { FastMath.sin(t0), FastMath.cos(t0) };
      double   t  = 10.0;
      double[] y  = new double[2];

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               MaxCountExceededException, NoBracketingException {
        double e = 1e-15;
        FirstOrderIntegrator integrator;
        integrator = new DormandPrince853Integrator(1.0e-3, 100.0, 1e-7, 1e-7);
        Event allEvents = new Event(true, true);
        integrator.addEventHandler(allEvents, 0.1, e, 1000,
                                   new BracketingNthOrderBrentSolver(1.0e-7, 5));
        Event onlyIncreasing = new Event(false, true);
        integrator.addEventHandler(new EventFilter(onlyIncreasing,
                                                   FilterType.TRIGGER_ONLY_INCREASING_EVENTS),
                                   0.1, e, 100,

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        integrator = new DormandPrince853Integrator(1.0e-3, 100.0, 1e-7, 1e-7);
        Event allEvents = new Event(true, true);
        integrator.addEventHandler(allEvents, 0.1, e, 1000,
                                   new BracketingNthOrderBrentSolver(1.0e-7, 5));
        Event onlyIncreasing = new Event(false, true);
        integrator.addEventHandler(new EventFilter(onlyIncreasing,
                                                   FilterType.TRIGGER_ONLY_INCREASING_EVENTS),
                                   0.1, e, 100,
                                   new BracketingNthOrderBrentSolver(1.0e-7, 5));
        double t0 = 0.5 * FastMath.PI;
        double tEnd = 5.5 * FastMath.PI;

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               MaxCountExceededException, NoBracketingException {
        double e = 1e-15;
        FirstOrderIntegrator integrator;
        integrator = new DormandPrince853Integrator(1.0e-3, 100.0, 1e-7, 1e-7);
        Event allEvents = new Event(true, true);
        integrator.addEventHandler(allEvents, 0.1, e, 1000,
                                   new BracketingNthOrderBrentSolver(1.0e-7, 5));
        Event onlyDecreasing = new Event(true, false);
        integrator.addEventHandler(new EventFilter(onlyDecreasing,
                                                   FilterType.TRIGGER_ONLY_DECREASING_EVENTS),
                                   0.1, e, 1000,

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        integrator = new DormandPrince853Integrator(1.0e-3, 100.0, 1e-7, 1e-7);
        Event allEvents = new Event(true, true);
        integrator.addEventHandler(allEvents, 0.1, e, 1000,
                                   new BracketingNthOrderBrentSolver(1.0e-7, 5));
        Event onlyDecreasing = new Event(true, false);
        integrator.addEventHandler(new EventFilter(onlyDecreasing,
                                                   FilterType.TRIGGER_ONLY_DECREASING_EVENTS),
                                   0.1, e, 1000,
                                   new BracketingNthOrderBrentSolver(1.0e-7, 5));
        double t0 = 0.5 * FastMath.PI;
        double tEnd = 5.5 * FastMath.PI;

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