Examples of FirstOrderIntegrator

org.apache.commons.math.ode.FirstOrderIntegrator

This interface represents a first order integrator for differential equations.

The classes which are devoted to solve first order differential equations should implement this interface. The problems which can be handled should implement the {@link FirstOrderDifferentialEquations} interface.

@see FirstOrderDifferentialEquations @see StepHandler @see SwitchingFunction @version $Revision: 620312 $ $Date: 2008-02-10 12:28:59 -0700 (Sun, 10 Feb 2008) $ @since 1.2

org.apache.commons.math3.ode.FirstOrderIntegrator

This interface represents a first order integrator for differential equations.

@see FirstOrderDifferentialEquations @see org.apache.commons.math3.ode.sampling.StepHandler @see org.apache.commons.math3.ode.events.EventHandler @since 1.2

    @Test
    public void testStepSize()
            throws DimensionMismatchException, NumberIsTooSmallException,
            MaxCountExceededException, NoBracketingException {
        final double step = 1.23456;
        FirstOrderIntegrator integ = new LutherIntegrator(step);
        integ.addStepHandler(new StepHandler() {
            public void handleStep(StepInterpolator interpolator, boolean isLast) {
                if (! isLast) {
                    Assert.assertEquals(step,
                                        interpolator.getCurrentTime() - interpolator.getPreviousTime(),
                                        1.0e-12);
                }
            }
            public void init(double t0, double[] y0, double t) {
            }
        });
        integ.integrate(new FirstOrderDifferentialEquations() {
            public void computeDerivatives(double t, double[] y, double[] dot) {
                dot[0] = 1.0;
            }
            public int getDimension() {
                return 1;

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Examples of FirstOrderIntegrator

Examples of org.apache.commons.math3.ode.FirstOrderIntegrator