Examples of org.apache.commons.math.ode.events.EventHandler

Package org.apache.commons.math.ode.events

Examples of org.apache.commons.math.ode.events.EventHandler

org.apache.commons.math.ode.events.EventHandler
This interface represents a handler for discrete events triggered during ODE integration.
Some events can be triggered at discrete times as an ODE problem is solved. This occurs for example when the integration process should be stopped as some state is reached (G-stop facility) when the precise date is unknown a priori, or when the derivatives have discontinuities, or simply when the user wants to monitor some states boundaries crossings.

These events are defined as occurring when a g switching function sign changes.

Since events are only problem-dependent and are triggered by the independent time variable and the state vector, they can occur at virtually any time, unknown in advance. The integrators will take care to avoid sign changes inside the steps, they will reduce the step size when such an event is detected in order to put this event exactly at the end of the current step. This guarantees that step interpolation (which always has a one step scope) is relevant even in presence of discontinuities. This is independent from the stepsize control provided by integrators that monitor the local error (this event handling feature is available for all integrators, including fixed step ones).
@version $Revision: 1067500 $ $Date: 2011-02-05 21:11:30 +0100 (sam. 05 févr. 2011) $ @since 1.2

      for (int i = 0; i < y.length; ++i) {
          Assert.assertEquals(y0[i] * Math.exp(k[i] * (finalT - t0)), y[i], 1.0e-9);
      }


      integrator.setInitialStepSize(60.0);
      integrator.addEventHandler(new EventHandler() {


          public void resetState(double t, double[] y) {
          }


          public double g(double t, double[] y) {

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      Assert.assertEquals(tEvent, finalT, 5.0e-6);
      for (int i = 0; i < y.length; ++i) {
          Assert.assertEquals(y0[i] * Math.exp(k[i] * (finalT - t0)), y[i], 1.0e-9);
      }


      integrator.addEventHandler(new EventHandler() {


          public void resetState(double t, double[] y) {
          }


          public double g(double t, double[] y) {

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          new HighamHall54Integrator(minStep, maxStep,
                                     scalAbsoluteTolerance, scalRelativeTolerance);
      TestProblemHandler handler = new TestProblemHandler(pb, integ);
      integ.addStepHandler(handler);


      integ.addEventHandler(new EventHandler() {
        public int eventOccurred(double t, double[] y, boolean increasing) {
          return EventHandler.CONTINUE;
        }
        public double g(double t, double[] y) throws EventException {
          double middle = (pb.getInitialTime() + pb.getFinalTime()) / 2;

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        new HighamHall54Integrator(minStep, maxStep,
                                   scalAbsoluteTolerance, scalRelativeTolerance);
    TestProblemHandler handler = new TestProblemHandler(pb, integ);
    integ.addStepHandler(handler);


    integ.addEventHandler(new EventHandler() {
      public int eventOccurred(double t, double[] y, boolean increasing) {
        return EventHandler.CONTINUE;
      }
      public double g(double t, double[] y) {
        double middle = (pb.getInitialTime() + pb.getFinalTime()) / 2;

View Full Code Here

          new HighamHall54Integrator(minStep, maxStep,
                                     scalAbsoluteTolerance, scalRelativeTolerance);
      TestProblemHandler handler = new TestProblemHandler(pb, integ);
      integ.addStepHandler(handler);


      integ.addEventHandler(new EventHandler() {
        public int eventOccurred(double t, double[] y, boolean increasing) {
          return EventHandler.CONTINUE;
        }
        public double g(double t, double[] y) throws EventException {
          double middle = (pb.getInitialTime() + pb.getFinalTime()) / 2;

View Full Code Here

        new HighamHall54Integrator(minStep, maxStep,
                                   scalAbsoluteTolerance, scalRelativeTolerance);
    TestProblemHandler handler = new TestProblemHandler(pb, integ);
    integ.addStepHandler(handler);


    integ.addEventHandler(new EventHandler() {
      public int eventOccurred(double t, double[] y, boolean increasing) {
        return EventHandler.CONTINUE;
      }
      public double g(double t, double[] y) {
        double middle = (pb.getInitialTime() + pb.getFinalTime()) / 2;

View Full Code Here

      for (int i = 0; i < y.length; ++i) {
          Assert.assertEquals(y0[i] * FastMath.exp(k[i] * (finalT - t0)), y[i], 1.0e-9);
      }


      integrator.setInitialStepSize(60.0);
      integrator.addEventHandler(new EventHandler() {


          public void resetState(double t, double[] y) {
          }


          public double g(double t, double[] y) {

View Full Code Here

      Assert.assertEquals(tEvent, finalT, 5.0e-6);
      for (int i = 0; i < y.length; ++i) {
          Assert.assertEquals(y0[i] * FastMath.exp(k[i] * (finalT - t0)), y[i], 1.0e-9);
      }


      integrator.addEventHandler(new EventHandler() {


          public void resetState(double t, double[] y) {
          }


          public double g(double t, double[] y) {

View Full Code Here

          new HighamHall54Integrator(minStep, maxStep,
                                     scalAbsoluteTolerance, scalRelativeTolerance);
      TestProblemHandler handler = new TestProblemHandler(pb, integ);
      integ.addStepHandler(handler);


      integ.addEventHandler(new EventHandler() {
        public int eventOccurred(double t, double[] y, boolean increasing) {
          return EventHandler.CONTINUE;
        }
        public double g(double t, double[] y) throws EventException {
          double middle = (pb.getInitialTime() + pb.getFinalTime()) / 2;

View Full Code Here

        new HighamHall54Integrator(minStep, maxStep,
                                   scalAbsoluteTolerance, scalRelativeTolerance);
    TestProblemHandler handler = new TestProblemHandler(pb, integ);
    integ.addStepHandler(handler);


    integ.addEventHandler(new EventHandler() {
      public int eventOccurred(double t, double[] y, boolean increasing) {
        return EventHandler.CONTINUE;
      }
      public double g(double t, double[] y) {
        double middle = (pb.getInitialTime() + pb.getFinalTime()) / 2;

View Full Code Here

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Related Classes of org.apache.commons.math.ode.events.EventHandler

org.apache.commons.math.ode.nonstiff.ClassicalRungeKuttaIntegratorTest

org.apache.commons.math.ode.nonstiff.DormandPrince853IntegratorTest

org.apache.commons.math.ode.nonstiff.HighamHall54IntegratorTest

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