org.apache.commons.math.ode
Class TestProblem2

java.lang.Object
  org.apache.commons.math.ode.TestProblemAbstract
      org.apache.commons.math.ode.TestProblem2

All Implemented Interfaces:

org.apache.commons.math.ode.FirstOrderDifferentialEquations

public class TestProblem2
extends TestProblemAbstract

This class is used in the junit tests for the ODE integrators.

This specific problem is the following differential equation :

    y' = t^3 - t y
 

with the initial condition y (0) = 0. The solution of this equation is the following function :

   y (t) = t^2 + 2 (exp (- t^2 / 2) - 1)
 

Field Summary

Fields inherited from class org.apache.commons.math.ode.TestProblemAbstract

calls, errorScale, n, t0, t1, y0

Constructor Summary

TestProblem2()
Simple constructor.

TestProblem2(TestProblem2 problem)
Copy constructor.

Method Summary

double[]	computeTheoreticalState(double t) Compute the theoretical state at the specified time.
TestProblem2	copy() Copy operation.
void	doComputeDerivatives(double t, double[] y, double[] yDot)

Methods inherited from class org.apache.commons.math.ode.TestProblemAbstract

computeDerivatives, getCalls, getDimension, getErrorScale, getEventsHandlers, getFinalTime, getInitialState, getInitialTime, setErrorScale, setFinalConditions, setInitialConditions

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TestProblem2

public TestProblem2()

Simple constructor.

TestProblem2

public TestProblem2(TestProblem2 problem)

Copy constructor.

Parameters:

problem - problem to copy

Method Detail

copy

public TestProblem2 copy()

Copy operation.

Specified by:

copy in class TestProblemAbstract

Returns:

a copy of the instance

doComputeDerivatives

public void doComputeDerivatives(double t,
                                 double[] y,
                                 double[] yDot)

Specified by:

doComputeDerivatives in class TestProblemAbstract

computeTheoreticalState

public double[] computeTheoreticalState(double t)

Description copied from class: TestProblemAbstract

Compute the theoretical state at the specified time.

Specified by:

computeTheoreticalState in class TestProblemAbstract

Parameters:

t - time at which the state is required

Returns:

state vector at time t