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vtkRungeKutta4.h
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vtkRungeKutta4.h
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkRungeKutta4.h
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
// .NAME vtkRungeKutta4 - Integrate an initial value problem using 4th
// order Runge-Kutta method.
// .SECTION Description
// This is a concrete sub-class of vtkInitialValueProblemSolver.
// It uses a 4th order Runge-Kutta method to obtain the values of
// a set of functions at the next time step.
// .SECTION See Also
// vtkInitialValueProblemSolver vtkRungeKutta45 vtkRungeKutta2 vtkFunctionSet
#ifndef __vtkRungeKutta4_h
#define __vtkRungeKutta4_h
#include "vtkInitialValueProblemSolver.h"
class VTK_COMMON_EXPORT vtkRungeKutta4 : public vtkInitialValueProblemSolver
{
public:
vtkTypeMacro(vtkRungeKutta4,vtkInitialValueProblemSolver);
virtual void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Construct a vtkRungeKutta4 with no initial FunctionSet.
static vtkRungeKutta4 *New();
// Description:
// Given initial values, xprev , initial time, t and a requested time
// interval, delT calculate values of x at t+delT (xnext).
// delTActual is always equal to delT.
// Since this class can not provide an estimate for the error error
// is set to 0.
// maxStep, minStep and maxError are unused.
// This method returns an error code representing the nature of
// the failure:
// OutOfDomain = 1,
// NotInitialized = 2,
// UnexpectedValue = 3
virtual int ComputeNextStep(double* xprev, double* xnext, double t,
double& delT, double maxError, double& error)
{
double minStep = delT;
double maxStep = delT;
double delTActual;
return this->ComputeNextStep(xprev, 0, xnext, t, delT, delTActual,
minStep, maxStep, maxError, error);
}
virtual int ComputeNextStep(double* xprev, double* dxprev, double* xnext,
double t, double& delT,
double maxError, double& error)
{
double minStep = delT;
double maxStep = delT;
double delTActual;
return this->ComputeNextStep(xprev, dxprev, xnext, t, delT, delTActual,
minStep, maxStep, maxError, error);
}
virtual int ComputeNextStep(double* xprev, double* xnext,
double t, double& delT, double& delTActual,
double minStep, double maxStep,
double maxError, double& error)
{
return this->ComputeNextStep(xprev, 0, xnext, t, delT, delTActual,
minStep, maxStep, maxError, error);
}
virtual int ComputeNextStep(double* xprev, double* dxprev, double* xnext,
double t, double& delT, double& delTActual,
double minStep, double maxStep,
double maxError, double& error);
protected:
vtkRungeKutta4();
~vtkRungeKutta4();
virtual void Initialize();
double* NextDerivs[3];
private:
vtkRungeKutta4(const vtkRungeKutta4&); // Not implemented.
void operator=(const vtkRungeKutta4&); // Not implemented.
};
#endif