Examples of org.apache.commons.math3.ode.sampling.StepHandler

Package org.apache.commons.math3.ode.sampling

Examples of org.apache.commons.math3.ode.sampling.StepHandler

org.apache.commons.math3.ode.sampling.StepHandler
This interface represents a handler that should be called after each successful step.
The ODE integrators compute the evolution of the state vector at some grid points that depend on their own internal algorithm. Once they have found a new grid point (possibly after having computed several evaluation of the derivative at intermediate points), they provide it to objects implementing this interface. These objects typically either ignore the intermediate steps and wait for the last one, store the points in an ephemeris, or forward them to specialized processing or output methods.
@see org.apache.commons.math3.ode.FirstOrderIntegrator @see org.apache.commons.math3.ode.SecondOrderIntegrator @see StepInterpolator @since 1.2

      double scalAbsoluteTolerance = 1.0e-8;
      double scalRelativeTolerance = scalAbsoluteTolerance;
      DormandPrince54Integrator integ = new DormandPrince54Integrator(minStep, maxStep,
                                                                      scalAbsoluteTolerance,
                                                                      scalRelativeTolerance);
      integ.addStepHandler(new StepHandler() {
          public void handleStep(StepInterpolator interpolator, boolean isLast)
              throws MaxCountExceededException {
              StepInterpolator cloned = interpolator.copy();
              double tA = cloned.getPreviousTime();
              double tB = cloned.getCurrentTime();

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    double scalAbsoluteTolerance = 1.0e-8;
    double scalRelativeTolerance = scalAbsoluteTolerance;
    DormandPrince853Integrator integ = new DormandPrince853Integrator(minStep, maxStep,
                                                                      scalAbsoluteTolerance,
                                                                      scalRelativeTolerance);
    integ.addStepHandler(new StepHandler() {
        public void handleStep(StepInterpolator interpolator, boolean isLast)
            throws MaxCountExceededException {
            StepInterpolator cloned = interpolator.copy();
            double tA = cloned.getPreviousTime();
            double tB = cloned.getCurrentTime();

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  public void testStepSize()
      throws DimensionMismatchException, NumberIsTooSmallException,
             MaxCountExceededException, NoBracketingException {
      final double step = 1.23456;
      FirstOrderIntegrator integ = new EulerIntegrator(step);
      integ.addStepHandler(new StepHandler() {
        public void handleStep(StepInterpolator interpolator, boolean isLast) {
            if (! isLast) {
                Assert.assertEquals(step,
                             interpolator.getCurrentTime() - interpolator.getPreviousTime(),
                             1.0e-12);

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    double scalAbsoluteTolerance = 1.0e-8;
    double scalRelativeTolerance = scalAbsoluteTolerance;
    HighamHall54Integrator integ = new HighamHall54Integrator(minStep, maxStep,
                                                              scalAbsoluteTolerance,
                                                              scalRelativeTolerance);
    integ.addStepHandler(new StepHandler() {
        public void handleStep(StepInterpolator interpolator, boolean isLast)
            throws MaxCountExceededException {
            StepInterpolator cloned = interpolator.copy();
            double tA = cloned.getPreviousTime();
            double tB = cloned.getCurrentTime();

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  public void testStepSize()
      throws DimensionMismatchException, NumberIsTooSmallException,
             MaxCountExceededException, NoBracketingException {
      final double step = 1.23456;
      FirstOrderIntegrator integ = new ClassicalRungeKuttaIntegrator(step);
      integ.addStepHandler(new StepHandler() {
          public void handleStep(StepInterpolator interpolator, boolean isLast) {
              if (! isLast) {
                  Assert.assertEquals(step,
                               interpolator.getCurrentTime() - interpolator.getPreviousTime(),
                               1.0e-12);

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  @Test
  public void testIssue596()
      throws DimensionMismatchException, NumberIsTooSmallException,
             MaxCountExceededException, NoBracketingException {
    FirstOrderIntegrator integ = new GraggBulirschStoerIntegrator(1e-10, 100.0, 1e-7, 1e-7);
      integ.addStepHandler(new StepHandler() {


          public void init(double t0, double[] y0, double t) {
          }


          public void handleStep(StepInterpolator interpolator, boolean isLast)

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  public void testStepSize()
      throws DimensionMismatchException, NumberIsTooSmallException,
             MaxCountExceededException, NoBracketingException {
      final double step = 1.23456;
      FirstOrderIntegrator integ = new MidpointIntegrator(step);
      integ.addStepHandler(new StepHandler() {
          public void handleStep(StepInterpolator interpolator, boolean isLast) {
              if (! isLast) {
                  Assert.assertEquals(step,
                               interpolator.getCurrentTime() - interpolator.getPreviousTime(),
                               1.0e-12);

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    public static void runExample1() {
      FirstOrderIntegrator integrator = new DormandPrince853Integrator(1.0e-8, 100.0, 1.0e-10, 1.0e-10);
      FirstOrderDifferentialEquations ode = new CircleODE(new double[] { 1.0, 1.0 }, 0.1);
      double[] y = new double[] { 0.0, 1.0 }; // initial state
      StepHandler stepHandler = new StepHandler() {
        public void init (double t0, double[] y0, double t) {
        }


        public void handleStep (StepInterpolator interpolator, boolean isLast) {
          double t = interpolator.getCurrentTime();

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  @Test
  public void testStepSize()
    {
      final double step = 1.23456;
      FirstOrderIntegrator integ = new MidpointIntegrator(step);
      integ.addStepHandler(new StepHandler() {
          public void handleStep(StepInterpolator interpolator, boolean isLast) {
              if (! isLast) {
                  Assert.assertEquals(step,
                               interpolator.getCurrentTime() - interpolator.getPreviousTime(),
                               1.0e-12);

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  }


  @Test
  public void testIssue596() {
    FirstOrderIntegrator integ = new GraggBulirschStoerIntegrator(1e-10, 100.0, 1e-7, 1e-7);
      integ.addStepHandler(new StepHandler() {


          public void init(double t0, double[] y0, double t) {
          }


          public void handleStep(StepInterpolator interpolator, boolean isLast) {

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