Package org.apache.commons.math.ode

Examples of org.apache.commons.math.ode.EulerStepInterpolator.storeTime()

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

    double[] result = interpolator.getInterpolatedState();
    for (int i = 0; i < result.length; ++i) {
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    double[][] yDot = { { 1.0, 2.0, -2.0 } };
    EulerStepInterpolator interpolator = new EulerStepInterpolator();
    interpolator.reinitialize(new DummyEquations(), y, yDot, 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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    double[] y = (double[]) y0.clone();
    double[][] yDot = { new double[y0.length] };
    EulerStepInterpolator interpolator = new EulerStepInterpolator();
    interpolator.reinitialize(new DummyEquations(), y, yDot, true);
    interpolator.storeTime(t0);

    double dt = 1.0;
    y[0] =  1.0;
    y[1] =  3.0;
    y[2] = -4.0;
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    y[2] = -4.0;
    yDot[0][0] = (y[0] - y0[0]) / dt;
    yDot[0][1] = (y[1] - y0[1]) / dt;
    yDot[0][2] = (y[2] - y0[2]) / dt;
    interpolator.shift();
    interpolator.storeTime(t0 + dt);

    interpolator.setInterpolatedTime(interpolator.getPreviousTime());
    double[] result = interpolator.getInterpolatedState();
    for (int i = 0; i < result.length; ++i) {
      assertTrue(Math.abs(result[i] - y0[i]) < 1.0e-10);
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    double[]   y    =   { 1.0, 3.0, -4.0 };
    double[][] yDot = { { 1.0, 2.0, -2.0 } };
    EulerStepInterpolator interpolator = new EulerStepInterpolator();
    interpolator.reinitialize(new DummyEquations(), y, yDot, true);
    interpolator.storeTime(0);
    interpolator.shift();
    interpolator.storeTime(1);

    interpolator.setInterpolatedTime(0.1);
    double[] result = interpolator.getInterpolatedState();
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    double[][] yDot = { { 1.0, 2.0, -2.0 } };
    EulerStepInterpolator interpolator = new EulerStepInterpolator();
    interpolator.reinitialize(new DummyEquations(), y, yDot, true);
    interpolator.storeTime(0);
    interpolator.shift();
    interpolator.storeTime(1);

    interpolator.setInterpolatedTime(0.1);
    double[] result = interpolator.getInterpolatedState();
    assertTrue(Math.abs(result[0] - 0.1) < 1.0e-10);
    assertTrue(Math.abs(result[1] - 1.2) < 1.0e-10);
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