org.apache.commons.math.ode
Class TestProblem1

java.lang.Object
  org.apache.commons.math.ode.TestProblemAbstract
      org.apache.commons.math.ode.TestProblem1

All Implemented Interfaces:

org.apache.commons.math.ode.FirstOrderDifferentialEquations

Direct Known Subclasses:

TestProblem5

public class TestProblem1
extends TestProblemAbstract

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

This specific problem is the following differential equation :

    y' = -y
 

the solution of this equation is a simple exponential function :

   y (t) = y (t0) exp (t0-t)
 

Field Summary

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

calls, errorScale, n, t0, t1, y0

Constructor Summary

TestProblem1()
Simple constructor.

TestProblem1(TestProblem1 problem)
Copy constructor.

Method Summary

double[]	computeTheoreticalState(double t) Compute the theoretical state at the specified time.
TestProblem1	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

TestProblem1

public TestProblem1()

Simple constructor.

TestProblem1

public TestProblem1(TestProblem1 problem)

Copy constructor.

Parameters:

problem - problem to copy

Method Detail

copy

public TestProblem1 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