Geant4 Cross Reference |
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Please see the license in the file LICENSE and URL above * 16 // * for the full disclaimer and the limitatio 16 // * for the full disclaimer and the limitation of liability. * 17 // * 17 // * * 18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and * 19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. * 20 // * By using, copying, modifying or distri 20 // * By using, copying, modifying or distributing the software (or * 21 // * any work based on the software) you ag 21 // * any work based on the software) you agree to acknowledge its * 22 // * use in resulting scientific publicati 22 // * use in resulting scientific publications, and indicate your * 23 // * acceptance of all terms of the Geant4 Sof 23 // * acceptance of all terms of the Geant4 Software license. * 24 // ******************************************* 24 // ******************************************************************** 25 // 25 // 26 // G4ExplicitEuler implementation << 27 // 26 // 28 // Explicit Euler: x_1 = x_0 + h * dx_0 << 27 // $Id: G4ExplicitEuler.cc 69786 2013-05-15 09:38:51Z gcosmo $ 29 // 28 // 30 // Most simple approach for solving linear dif << 31 // Take the current derivative and add it to t << 32 // 29 // 33 // Created: W.Wander <wwc@mit.edu>, 12.09.1997 << 30 // Explicit Euler: x_1 = x_0 + h * dx_0 >> 31 // >> 32 // most simple approach for solving linear differential equations. >> 33 // Take the current derivative and add it to the current position. >> 34 // >> 35 // W.Wander <wwc@mit.edu> 12/09/97 34 // ------------------------------------------- 36 // ------------------------------------------------------------------- 35 37 36 #include "G4ExplicitEuler.hh" 38 #include "G4ExplicitEuler.hh" 37 #include "G4ThreeVector.hh" 39 #include "G4ThreeVector.hh" 38 40 39 ////////////////////////////////////////////// 41 ////////////////////////////////////////////////////////////////////////// 40 // 42 // 41 // Constructor 43 // Constructor 42 // << 44 43 G4ExplicitEuler::G4ExplicitEuler(G4EquationOfM 45 G4ExplicitEuler::G4ExplicitEuler(G4EquationOfMotion* EqRhs, 44 G4int numberO 46 G4int numberOfVariables) 45 : G4MagErrorStepper(EqRhs, numberOfVariables) 47 : G4MagErrorStepper(EqRhs, numberOfVariables) 46 { 48 { 47 } 49 } 48 50 49 51 50 ////////////////////////////////////////////// 52 /////////////////////////////////////////////////////////////////////// 51 // 53 // 52 // Destructor 54 // Destructor 53 // << 55 54 G4ExplicitEuler::~G4ExplicitEuler() = default; << 56 G4ExplicitEuler::~G4ExplicitEuler() >> 57 { >> 58 } 55 59 56 60 57 ////////////////////////////////////////////// 61 /////////////////////////////////////////////////////////////////////// 58 // 62 // 59 // 63 // 60 // << 64 61 void 65 void 62 G4ExplicitEuler::DumbStepper( const G4double y << 66 G4ExplicitEuler::DumbStepper( const G4double yIn[], 63 const G4double dydx[], << 67 const G4double dydx[], 64 G4double h, << 68 G4double h, 65 G4double yOut[] ) << 69 G4double yOut[] ) 66 { 70 { 67 const G4int numberOfVariables = GetNumberOfV << 71 const G4int numberOfVariables= GetNumberOfVariables(); 68 72 69 // Initialise time to t0, needed when it is 73 // Initialise time to t0, needed when it is not updated by the integration. >> 74 // yOut[7] = yIn[7]; // Better to set it to NaN; // TODO >> 75 >> 76 G4int i; 70 77 71 for(G4int i=0; i< numberOfVariables; ++i) << 78 for(i=0;i< numberOfVariables;i++) 72 { 79 { 73 yOut[i] = yIn[i] + h*dydx[i] ; 80 yOut[i] = yIn[i] + h*dydx[i] ; // 1st and only Step 74 } 81 } 75 82 76 return; << 83 return ; 77 } 84 } 78 85