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G4DormandPrinceRK78.hh
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//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// G4DormandPrinceRK78
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//
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// Class description:
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//
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// Dormand-Prince 8(7)13M non-FSAL RK method, a 13 stage embedded
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// explicit Runge-Kutta method, using a pair of 7th and 8th order formulae.
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//
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// Paper proposing this RK scheme:
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// P.J. Prince, J.R. Dormand, "High order embedded Runge-Kutta formulae",
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// Journal of Computational and Applied Mathematics, Volume 7, Issue 1, 1981,
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// Pages 67-75, ISSN 0377-0427, DOI: 10.1016/0771-050X(81)90010-3
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// Created: Somnath Banerjee, Google Summer of Code 2015, 28 June 2015
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// Supervision: John Apostolakis, CERN
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// --------------------------------------------------------------------
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#ifndef G4DORMAND_PRINCE_RK78_HH
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#define G4DORMAND_PRINCE_RK78_HH
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#include "
G4MagIntegratorStepper.hh
"
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class
G4DormandPrinceRK78
:
public
G4MagIntegratorStepper
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{
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public
:
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G4DormandPrinceRK78
(
G4EquationOfMotion
* EqRhs,
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G4int
numberOfVariables = 6,
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G4bool
primary =
true
);
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~G4DormandPrinceRK78
();
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G4DormandPrinceRK78
(
const
G4DormandPrinceRK78
&) =
delete
;
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G4DormandPrinceRK78
&
operator=
(
const
G4DormandPrinceRK78
&) =
delete
;
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void
Stepper
(
const
G4double
y
[],
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const
G4double
dydx[],
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G4double
h
,
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G4double
yout[],
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G4double
yerr[]) ;
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G4double
DistChord
()
const
;
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inline
G4int
IntegratorOrder
()
const
{
return
7; }
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private
:
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G4double
*
ak2
, *
ak3
, *
ak4
, *
ak5
, *
ak6
, *
ak7
, *
ak8
,
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*
ak9
, *
ak10
, *
ak11
, *
ak12
, *
ak13
,
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*
yTemp
, *
yIn
;
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G4double
fLastStepLength
= -1.0;
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G4double
*
fLastInitialVector
, *
fLastFinalVector
,
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*
fLastDyDx
, *
fMidVector
, *
fMidError
;
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// For DistChord calculations
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G4DormandPrinceRK78
*
fAuxStepper
=
nullptr
;
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};
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#endif
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include
G4DormandPrinceRK78.hh
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. updated:
Wed Jun 29 2022 17:25:16
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