Package org.apache.commons.math.ode.sampling

Examples of org.apache.commons.math.ode.sampling.DummyStepInterpolator

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  @Test
  public void testNoReset() throws DerivativeException {

    double[]   y    =   { 0.0, 1.0, -2.0 };
    DummyStepInterpolator interpolator = new DummyStepInterpolator(y, new double[y.length], true);
    interpolator.storeTime(0);
    interpolator.shift();
    interpolator.storeTime(1);

    double[] result = interpolator.getInterpolatedState();
    for (int i = 0; i < result.length; ++i) {
      assertTrue(FastMath.abs(result[i] - y[i]) < 1.0e-10);
    }

  }
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  @Test
  public void testFixedState()
    throws DerivativeException {

    double[]   y    =   { 1.0, 3.0, -4.0 };
    DummyStepInterpolator interpolator = new DummyStepInterpolator(y, new double[y.length], true);
    interpolator.storeTime(0);
    interpolator.shift();
    interpolator.storeTime(1);

    interpolator.setInterpolatedTime(0.1);
    double[] result = interpolator.getInterpolatedState();
    for (int i = 0; i < result.length; ++i) {
        assertTrue(FastMath.abs(result[i] - y[i]) < 1.0e-10);
    }

    interpolator.setInterpolatedTime(0.5);
    result = interpolator.getInterpolatedState();
    for (int i = 0; i < result.length; ++i) {
        assertTrue(FastMath.abs(result[i] - y[i]) < 1.0e-10);
    }

  }
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  @Test
  public void testSerialization()
  throws DerivativeException, IOException, ClassNotFoundException {

    double[]   y    =   { 0.0, 1.0, -2.0 };
    DummyStepInterpolator interpolator = new DummyStepInterpolator(y, new double[y.length], true);
    interpolator.storeTime(0);
    interpolator.shift();
    interpolator.storeTime(1);

    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    ObjectOutputStream    oos = new ObjectOutputStream(bos);
    oos.writeObject(interpolator);

    assertTrue(bos.size () > 200);
    assertTrue(bos.size () < 300);

    ByteArrayInputStream  bis = new ByteArrayInputStream(bos.toByteArray());
    ObjectInputStream     ois = new ObjectInputStream(bis);
    DummyStepInterpolator dsi = (DummyStepInterpolator) ois.readObject();

    dsi.setInterpolatedTime(0.5);
    double[] result = dsi.getInterpolatedState();
    for (int i = 0; i < result.length; ++i) {
        assertTrue(FastMath.abs(result[i] - y[i]) < 1.0e-10);
    }

  }
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      }
      return false;
  }

  private StepInterpolator buildInterpolator(double t0, double[] y0, double t1) {
      DummyStepInterpolator interpolator  = new DummyStepInterpolator(y0, t1 >= t0);
      interpolator.storeTime(t0);
      interpolator.shift();
      interpolator.storeTime(t1);
      return interpolator;
  }
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  @Test
  public void testNoReset() throws DerivativeException {

    double[]   y    =   { 0.0, 1.0, -2.0 };
    DummyStepInterpolator interpolator = new DummyStepInterpolator(y, true);
    interpolator.storeTime(0);
    interpolator.shift();
    interpolator.storeTime(1);

    double[] result = interpolator.getInterpolatedState();
    for (int i = 0; i < result.length; ++i) {
      assertTrue(Math.abs(result[i] - y[i]) < 1.0e-10);
    }

  }
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  @Test
  public void testFixedState()
    throws DerivativeException {

    double[]   y    =   { 1.0, 3.0, -4.0 };
    DummyStepInterpolator interpolator = new DummyStepInterpolator(y, true);
    interpolator.storeTime(0);
    interpolator.shift();
    interpolator.storeTime(1);

    interpolator.setInterpolatedTime(0.1);
    double[] result = interpolator.getInterpolatedState();
    for (int i = 0; i < result.length; ++i) {
        assertTrue(Math.abs(result[i] - y[i]) < 1.0e-10);
    }

    interpolator.setInterpolatedTime(0.5);
    result = interpolator.getInterpolatedState();
    for (int i = 0; i < result.length; ++i) {
        assertTrue(Math.abs(result[i] - y[i]) < 1.0e-10);
    }

  }
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  @Test
  public void testSerialization()
  throws DerivativeException, IOException, ClassNotFoundException {

    double[]   y    =   { 0.0, 1.0, -2.0 };
    DummyStepInterpolator interpolator = new DummyStepInterpolator(y, true);
    interpolator.storeTime(0);
    interpolator.shift();
    interpolator.storeTime(1);

    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    ObjectOutputStream    oos = new ObjectOutputStream(bos);
    oos.writeObject(interpolator);

    assertTrue(bos.size () > 150);
    assertTrue(bos.size () < 250);

    ByteArrayInputStream  bis = new ByteArrayInputStream(bos.toByteArray());
    ObjectInputStream     ois = new ObjectInputStream(bis);
    DummyStepInterpolator dsi = (DummyStepInterpolator) ois.readObject();

    dsi.setInterpolatedTime(0.5);
    double[] result = dsi.getInterpolatedState();
    for (int i = 0; i < result.length; ++i) {
        assertTrue(Math.abs(result[i] - y[i]) < 1.0e-10);
    }

  }
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    if (denseOutput || (! eventsHandlersManager.isEmpty())) {
      interpolator = new GraggBulirschStoerStepInterpolator(y, yDot0,
                                                            y1, yDot1,
                                                            yMidDots, forward);
    } else {
      interpolator = new DummyStepInterpolator(y, forward);
    }
    interpolator.storeTime(t0);

    stepStart = t0;
    double  hNew             = 0;
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    if (requiresDenseOutput() || (! eventsHandlersManager.isEmpty())) {
      final RungeKuttaStepInterpolator rki = (RungeKuttaStepInterpolator) prototype.copy();
      rki.reinitialize(this, yTmp, yDotK, forward);
      interpolator = rki;
    } else {
      interpolator = new DummyStepInterpolator(yTmp, forward);
    }
    interpolator.storeTime(t0);

    // set up integration control objects
    stepStart = t0;
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    if (requiresDenseOutput() || (! eventsHandlersManager.isEmpty())) {
      final RungeKuttaStepInterpolator rki = (RungeKuttaStepInterpolator) prototype.copy();
      rki.reinitialize(this, yTmp, yDotK, forward);
      interpolator = rki;
    } else {
      interpolator = new DummyStepInterpolator(yTmp, forward);
    }
    interpolator.storeTime(t0);

    // set up integration control objects
    stepStart         = t0;
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Related Classes of org.apache.commons.math.ode.sampling.DummyStepInterpolator

  • org.apache.commons.math.ode.ContinuousOutputModelTest
  • org.apache.commons.math.ode.events.EventStateTest
  • org.apache.commons.math.ode.nonstiff.EmbeddedRungeKuttaIntegrator
  • org.apache.commons.math.ode.nonstiff.GraggBulirschStoerIntegrator
  • org.apache.commons.math.ode.nonstiff.RungeKuttaIntegrator
  • org.apache.commons.math.ode.sampling.DummyStepInterpolatorTest
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