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G4CashKarpRKF45.hh
Go to the documentation of this file.
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the newest version in sPHENIX GitHub for file G4CashKarpRKF45.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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// G4CashKarpRKF45
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//
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// Class description:
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//
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// The Cash-Karp Runge-Kutta-Fehlberg 4/5 method is an embedded fourth
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// order method (giving fifth-order accuracy) for the solution of an ODE.
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// Two different fourth order estimates are calculated; their difference
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// gives an error estimate. [ref. Numerical Recipes in C, 2nd Edition]
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// It is used to integrate the equations of the motion of a particle
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// in a magnetic field.
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// Authors: J.Apostolakis, V.Grichine - 30.01.1997
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// -------------------------------------------------------------------
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#ifndef G4CASHKARP_RKF45_HH
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#define G4CASHKARP_RKF45_HH
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#include "
G4MagIntegratorStepper.hh
"
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class
G4CashKarpRKF45
:
public
G4MagIntegratorStepper
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{
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public
:
// with description
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G4CashKarpRKF45
(
G4EquationOfMotion
* EqRhs,
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G4int
numberOfVariables = 6,
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G4bool
primary =
true
) ;
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~G4CashKarpRKF45
() ;
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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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public
:
// without description
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G4double
DistChord
()
const
;
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G4int
IntegratorOrder
()
const
{
return
4; }
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private
:
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void
StepWithEst
(
const
G4double
yIn
[],
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const
G4double
dydx[],
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G4double
Step,
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G4double
yOut[],
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G4double
& alpha2,
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G4double
& beta2,
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const
G4double
B1[],
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G4double
B2[] );
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// No longer used. Obsolete.
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G4CashKarpRKF45
(
const
G4CashKarpRKF45
&);
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G4CashKarpRKF45
&
operator=
(
const
G4CashKarpRKF45
&);
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// Private copy constructor and assignment operator.
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private
:
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G4double
*
ak2
, *
ak3
, *
ak4
, *
ak5
, *
ak6
, *
yTemp
, *
yIn
;
// *ak7
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// scratch space
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G4double
fLastStepLength
= 0.0;
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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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G4CashKarpRKF45
*
fAuxStepper
=
nullptr
;
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};
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#endif
geant4
tree
geant4-10.6-release
source
geometry
magneticfield
include
G4CashKarpRKF45.hh
Built by
Jin Huang
. updated:
Wed Jun 29 2022 17:25:16
using
1.8.2 with
ECCE GitHub integration