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This commit is contained in:
Gabriele Cosmo
2019-12-06 15:12:28 +01:00
parent b2a62ae692
commit 5baee230e9
2997 changed files with 141580 additions and 98673 deletions
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source/geometry/magneticfield/src/G4SimpleRunge.cc
+15 -26
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@@ -23,18 +23,9 @@
// * acceptance of all terms of the Geant4 Software license. *
// ********************************************************************
//
// G4SimpleRunge implementation
//
//
// Simple Runge:
//
// x_1 = x_0 + h * ( dx( t_0+h/2, x_0 + h/2 * dx( t_0, x_0) ) )
//
// Second order solver.
// Takes the derivative at a position to be assumed at the middle of the
// Step and adds it to the current position.
//
//
// W.Wander <wwc@mit.edu> 12/09/97
// Created: W.Wander <wwc@mit.edu>, 12/09/1997
// -------------------------------------------------------------------
#include "G4SimpleRunge.hh"
@@ -43,53 +34,51 @@
////////////////////////////////////////////////////////////////
//
// Constructor
//
G4SimpleRunge::G4SimpleRunge(G4EquationOfMotion* EqRhs, G4int numberOfVariables)
: G4MagErrorStepper(EqRhs, numberOfVariables),
fNumberOfVariables(numberOfVariables)
{
unsigned int noVariables= std::max(numberOfVariables,
GetNumberOfStateVariables());
GetNumberOfStateVariables());
// To deal with Time >= 7+1
dydxTemp = new G4double[noVariables] ;
yTemp = new G4double[noVariables] ;
}
/////////////////////////////////////////////////////////////////
//
// Destructor
//
G4SimpleRunge::~G4SimpleRunge()
{
delete[] dydxTemp;
delete[] yTemp;
delete [] dydxTemp;
delete [] yTemp;
}
//////////////////////////////////////////////////////////////////
//
// DumbStepper
//
void
G4SimpleRunge::DumbStepper( const G4double yIn[],
const G4double dydx[],
G4double h,
G4double yOut[])
const G4double dydx[],
G4double h,
G4double yOut[] )
{
// Initialise time to t0, needed when it is not updated by the integration.
yTemp[7] = yOut[7] = yIn[7]; // Better to set it to NaN; // TODO
//
yTemp[7] = yOut[7] = yIn[7];
G4int i;
for( i = 0; i < fNumberOfVariables; i++ )
for( G4int i = 0; i < fNumberOfVariables; ++i )
{
yTemp[i] = yIn[i] + 0.5 * h*dydx[i] ;
}
RightHandSide(yTemp,dydxTemp);
for( i = 0; i < fNumberOfVariables; i++ )
for( G4int i = 0; i < fNumberOfVariables; ++i )
{
yOut[i] = yIn[i] + h * ( dydxTemp[i] );
}