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Comparing trunk/OOPSE/libmdtools/Integrator.hpp (file contents):
Revision 747 by gezelter, Fri Sep 5 21:28:52 2003 UTC vs.
Revision 1268 by tim, Fri Jun 11 17:16:21 2004 UTC

# Line 4 | Line 4
4   #include <string>
5   #include <vector>
6   #include "Atom.hpp"
7 + #include "StuntDouble.hpp"
8   #include "Molecule.hpp"
9   #include "SRI.hpp"
10   #include "AbstractClasses.hpp"
# Line 12 | Line 13
13   #include "Thermo.hpp"
14   #include "ReadWrite.hpp"
15   #include "ZConsWriter.hpp"
16 + #include "Restraints.hpp"
17  
18   using namespace std;
19   const double kB = 8.31451e-7;// boltzmann constant amu*Ang^2*fs^-2/K
# Line 20 | Line 22 | const double tol = 1.0e-6;
22   const int maxIteration = 300;
23   const double tol = 1.0e-6;
24  
25 <
25 > class VelVerletConsFramework;
26   template<typename T = BaseIntegrator> class Integrator : public T {
27  
28   public:
29    Integrator( SimInfo *theInfo, ForceFields* the_ff );
30    virtual ~Integrator();
31    void integrate( void );
32 +  virtual double  getConservedQuantity(void);
33 +  virtual string getAdditionalParameters(void);
34  
31 –
35   protected:
36 <  
36 >
37    virtual void integrateStep( int calcPot, int calcStress );
38 <  virtual void preMove( void );
38 >  //virtual void preMove( void );
39    virtual void moveA( void );
40    virtual void moveB( void );
41 <  virtual void constrainA( void );
42 <  virtual void constrainB( void );
41 >  //virtual void constrainA( void );
42 >  //virtual void constrainB( void );
43    virtual int  readyCheck( void ) { return 1; }
44  
45    virtual void resetIntegrator( void ) { }
46  
47 <  virtual void calcForce( int calcPot, int calcStress );  
47 >  virtual void calcForce( int calcPot, int calcStress );
48    virtual void thermalize();
49 <  
50 <  void checkConstraints( void );
51 <  void rotate( int axes1, int axes2, double angle, double j[3],
49 >
50 >  virtual bool stopIntegrator() {return false;}
51 >
52 >  virtual void rotationPropagation( StuntDouble* sd, double ji[3] );
53 >
54 >  //void checkConstraints( void );
55 >  void rotate( int axes1, int axes2, double angle, double j[3],
56           double A[3][3] );
57 <        
57 >
58    ForceFields* myFF;
59  
60    SimInfo *info; // all the info we'll ever need
61 +  vector<StuntDouble*> integrableObjects;
62    int nAtoms;  /* the number of atoms */
63    int oldAtoms;
64    Atom **atoms; /* array of atom pointers */
65    Molecule* molecules;
66    int nMols;
67  
68 <  int isConstrained; // boolean to know whether the systems contains
61 <         // constraints.
62 <  int nConstrained;  // counter for number of constraints
63 <  int *constrainedA; // the i of a constraint pair
64 <  int *constrainedB; // the j of a constraint pair
65 <  double *constrainedDsqr; // the square of the constraint distance
66 <  
67 <  int* moving; // tells whether we are moving atom i
68 <  int* moved;  // tells whether we have moved atom i
69 <  double* oldPos; // pre constrained positions
68 >  VelVerletConsFramework* consFramework;
69  
70 +  //int isConstrained; // boolean to know whether the systems contains constraints.
71 +  //int nConstrained;  // counter for number of constraints
72 +  //int *constrainedA; // the i of a constraint pair
73 +  //int *constrainedB; // the j of a constraint pair
74 +  //double *constrainedDsqr; // the square of the constraint distance
75 +
76 +  //int* moving; // tells whether we are moving atom i
77 +  //int* moved;  // tells whether we have moved atom i
78 +  //double* oldPos; // pre constrained positions
79 +
80    short isFirst; /*boolean for the first time integrate is called */
81 <  
81 >
82    double dt;
83    double dt2;
84  
85    Thermo *tStats;
86    StatWriter*  statOut;
87    DumpWriter*  dumpOut;
88 <  
88 >
89   };
90  
91   typedef Integrator<BaseIntegrator> RealIntegrator;
92  
93 + // ansi instantiation
94 + template class Integrator<BaseIntegrator>;
95 +
96   template<typename T> class NVE : public T {
97  
98   public:
99    NVE ( SimInfo *theInfo, ForceFields* the_ff ):
100      T( theInfo, the_ff ){}
101 <  virtual ~NVE(){}  
101 >  virtual ~NVE(){}
102   };
103  
104  
# Line 95 | Line 107 | template<typename T> class NVT : public T { (public)
107   public:
108  
109    NVT ( SimInfo *theInfo, ForceFields* the_ff);
110 <  virtual ~NVT() {}
110 >  virtual ~NVT();
111  
112    void setTauThermostat(double tt) {tauThermostat = tt; have_tau_thermostat=1;}
113    void setTargetTemp(double tt) {targetTemp = tt; have_target_temp = 1;}
114 +  void setChiTolerance(double tol) {chiTolerance = tol;}
115 +  virtual double  getConservedQuantity(void);
116 +  virtual string getAdditionalParameters(void);
117  
118   protected:
119  
# Line 113 | Line 128 | template<typename T> class NVT : public T { (public)
128  
129    double chi;
130  
131 +  //integral of chi(t)dt
132 +  double integralOfChidt;
133 +
134    // targetTemp must be set.  tauThermostat must also be set;
135  
136    double targetTemp;
137    double tauThermostat;
138 <  
138 >
139    short int have_tau_thermostat, have_target_temp;
140  
141 +  double *oldVel;
142 +  double *oldJi;
143 +
144 +  double chiTolerance;
145 +  short int have_chi_tolerance;
146 +
147   };
148  
149  
150  
151 < template<typename T> class NPTi : public T{
151 > template<typename T> class NPT : public T{
152  
153   public:
154  
155 <  NPTi ( SimInfo *theInfo, ForceFields* the_ff);
156 <  virtual ~NPTi() {};
155 >  NPT ( SimInfo *theInfo, ForceFields* the_ff);
156 >  virtual ~NPT();
157  
158    virtual void integrateStep( int calcPot, int calcStress ){
159      calcStress = 1;
160      T::integrateStep( calcPot, calcStress );
161    }
162  
163 +  virtual double getConservedQuantity(void) = 0;
164 +  virtual string getAdditionalParameters(void) = 0;
165 +  
166 +  double myTauThermo( void ) { return tauThermostat; }
167 +  double myTauBaro( void ) { return tauBarostat; }
168 +
169    void setTauThermostat(double tt) {tauThermostat = tt; have_tau_thermostat=1;}
170    void setTauBarostat(double tb) {tauBarostat = tb; have_tau_barostat=1;}
171    void setTargetTemp(double tt) {targetTemp = tt; have_target_temp = 1;}
172    void setTargetPressure(double tp) {targetPressure = tp; have_target_pressure = 1;}
173 +  void setChiTolerance(double tol) {chiTolerance = tol; have_chi_tolerance = 1;}
174 +  void setPosIterTolerance(double tol) {posIterTolerance = tol; have_pos_iter_tolerance = 1;}
175 +  void setEtaTolerance(double tol) {etaTolerance = tol; have_eta_tolerance = 1;}
176  
177   protected:
178  
# Line 150 | Line 183 | template<typename T> class NPTi : public T{ (protected
183  
184    virtual void resetIntegrator( void );
185  
186 <  // chi and eta are the propagated degrees of freedom
186 >  virtual void getVelScaleA( double sc[3], double vel[3] ) = 0;
187 >  virtual void getVelScaleB( double sc[3], int index ) = 0;
188 >  virtual void getPosScale(double pos[3], double COM[3],
189 >                           int index, double sc[3]) = 0;
190  
191 <  double chi;
156 <  double eta;
157 <  double NkBT;
191 >  virtual void calcVelScale( void ) = 0;
192  
193 <  // targetTemp, targetPressure, and tauBarostat must be set.  
194 <  // One of qmass or tauThermostat must be set;
193 >  virtual bool chiConverged( void );
194 >  virtual bool etaConverged( void ) = 0;
195  
196 <  double targetTemp;
197 <  double targetPressure;
198 <  double tauThermostat;
199 <  double tauBarostat;
196 >  virtual void evolveChiA( void );
197 >  virtual void evolveEtaA( void ) = 0;
198 >  virtual void evolveChiB( void );
199 >  virtual void evolveEtaB( void ) = 0;
200  
201 <  short int have_tau_thermostat, have_tau_barostat, have_target_temp;
168 <  short int have_target_pressure;
201 >  virtual void scaleSimBox( void ) = 0;
202  
203 < };
171 <
172 < template<typename T> class NPTim : public T{
173 <
174 < public:
175 <
176 <  NPTim ( SimInfo *theInfo, ForceFields* the_ff);
177 <  virtual ~NPTim() {};
178 <
179 <  virtual void integrateStep( int calcPot, int calcStress ){
180 <    calcStress = 1;
181 <    T::integrateStep( calcPot, calcStress );
182 <  }
183 <
184 <  void setTauThermostat(double tt) {tauThermostat = tt; have_tau_thermostat=1;}
185 <  void setTauBarostat(double tb) {tauBarostat = tb; have_tau_barostat=1;}
186 <  void setTargetTemp(double tt) {targetTemp = tt; have_target_temp = 1;}
187 <  void setTargetPressure(double tp) {targetPressure = tp; have_target_pressure = 1;}
203 >  void accIntegralOfChidt(void) { integralOfChidt += dt * chi;}
204  
189 – protected:
190 –
191 –  virtual void moveA( void );
192 –  virtual void moveB( void );
193 –
194 –  virtual int readyCheck();
195 –
196 –  virtual void resetIntegrator( void );
197 –
198 –  Molecule* myMolecules;
199 –  Atom** myAtoms;
200 –
205    // chi and eta are the propagated degrees of freedom
206  
207 +  double oldChi;
208 +  double prevChi;
209    double chi;
204 –  double eta;
210    double NkBT;
211 +  double fkBT;
212  
213 <  // targetTemp, targetPressure, and tauBarostat must be set.  
213 >  double tt2, tb2;
214 >  double instaTemp, instaPress, instaVol;
215 >  double press[3][3];
216 >
217 >  int Nparticles;
218 >
219 >  double integralOfChidt;
220 >
221 >  // targetTemp, targetPressure, and tauBarostat must be set.
222    // One of qmass or tauThermostat must be set;
223  
224    double targetTemp;
# Line 215 | Line 229 | template<typename T> class NPTim : public T{ (protecte
229    short int have_tau_thermostat, have_tau_barostat, have_target_temp;
230    short int have_target_pressure;
231  
232 +  double *oldPos;
233 +  double *oldVel;
234 +  double *oldJi;
235 +
236 +  double chiTolerance;
237 +  short int have_chi_tolerance;
238 +  double posIterTolerance;
239 +  short int have_pos_iter_tolerance;
240 +  double etaTolerance;
241 +  short int have_eta_tolerance;
242 +
243   };
244  
245 < template<typename T> class NPTf : public T{
245 > template<typename T> class NPTi : public T{
246  
247   public:
248 +  NPTi( SimInfo *theInfo, ForceFields* the_ff);
249 +  ~NPTi();
250  
251 <  NPTf ( SimInfo *theInfo, ForceFields* the_ff);
252 <  virtual ~NPTf() {};
251 >  virtual double getConservedQuantity(void);
252 >  virtual void resetIntegrator(void);
253 >  virtual string getAdditionalParameters(void);
254 > protected:
255  
227 –  virtual void integrateStep( int calcPot, int calcStress ){
228 –    calcStress = 1;
229 –    T::integrateStep( calcPot, calcStress );
230 –  }
256  
232 –  void setTauThermostat(double tt) {tauThermostat = tt; have_tau_thermostat=1;}
233 –  void setTauBarostat(double tb) {tauBarostat = tb; have_tau_barostat=1;}
234 –  void setTargetTemp(double tt) {targetTemp = tt; have_target_temp = 1;}
235 –  void setTargetPressure(double tp) {targetPressure = tp; have_target_pressure = 1;}
257  
258 < protected:
258 >  virtual void evolveEtaA(void);
259 >  virtual void evolveEtaB(void);
260  
261 <  virtual void  moveA( void );
240 <  virtual void moveB( void );
261 >  virtual bool etaConverged( void );
262  
263 <  virtual void resetIntegrator( void );
263 >  virtual void scaleSimBox( void );
264  
265 <  virtual int readyCheck();
265 >  virtual void getVelScaleA( double sc[3], double vel[3] );
266 >  virtual void getVelScaleB( double sc[3], int index );
267 >  virtual void getPosScale(double pos[3], double COM[3],
268 >                           int index, double sc[3]);
269  
270 <  // chi and eta are the propagated degrees of freedom
270 >  virtual void calcVelScale( void );
271  
272 <  double chi;
273 <  double eta[3][3];
274 <  double NkBT;
272 >  double eta, oldEta, prevEta;
273 >  double vScale;
274 > };
275  
276 <  // targetTemp, targetPressure, and tauBarostat must be set.  
253 <  // One of qmass or tauThermostat must be set;
276 > template<typename T> class NPTf : public T{
277  
278 <  double targetTemp;
256 <  double targetPressure;
257 <  double tauThermostat;
258 <  double tauBarostat;
278 > public:
279  
280 <  short int have_tau_thermostat, have_tau_barostat, have_target_temp;
281 <  short int have_target_pressure;
280 >  NPTf ( SimInfo *theInfo, ForceFields* the_ff);
281 >  virtual ~NPTf();
282  
283 < };
283 >  virtual double getConservedQuantity(void);
284 >  virtual string getAdditionalParameters(void);
285 >  virtual void resetIntegrator(void);
286  
287 < template<typename T> class NPTfm : public T{
287 > protected:
288  
289 < public:
289 >  virtual void evolveEtaA(void);
290 >  virtual void evolveEtaB(void);
291  
292 <  NPTfm ( SimInfo *theInfo, ForceFields* the_ff);
293 <  virtual ~NPTfm() {};
292 >  virtual bool etaConverged( void );
293 >
294 >  virtual void scaleSimBox( void );
295 >
296 >  virtual void getVelScaleA( double sc[3], double vel[3] );
297 >  virtual void getVelScaleB( double sc[3], int index );
298 >  virtual void getPosScale(double pos[3], double COM[3],
299 >                           int index, double sc[3]);
300 >
301 >  virtual void calcVelScale( void );
302  
272 –  virtual void integrateStep( int calcPot, int calcStress ){
273 –    calcStress = 1;
274 –    T::integrateStep( calcPot, calcStress );
275 –  }
276 –
277 –  void setTauThermostat(double tt) {tauThermostat = tt; have_tau_thermostat=1;}
278 –  void setTauBarostat(double tb) {tauBarostat = tb; have_tau_barostat=1;}
279 –  void setTargetTemp(double tt) {targetTemp = tt; have_target_temp = 1;}
280 –  void setTargetPressure(double tp) {targetPressure = tp; have_target_pressure = 1;}
281 –
282 – protected:
283 –
284 –  virtual void  moveA( void );
285 –  virtual void moveB( void );
286 –
287 –  virtual void resetIntegrator( void );
288 –
289 –  virtual int readyCheck();
290 –
291 –  Molecule* myMolecules;
292 –  Atom** myAtoms;
293 –
294 –  // chi and eta are the propagated degrees of freedom
295 –
296 –  double chi;
303    double eta[3][3];
304 <  double NkBT;
305 <
306 <  // targetTemp, targetPressure, and tauBarostat must be set.  
301 <  // One of qmass or tauThermostat must be set;
302 <
303 <  double targetTemp;
304 <  double targetPressure;
305 <  double tauThermostat;
306 <  double tauBarostat;
307 <
308 <  short int have_tau_thermostat, have_tau_barostat, have_target_temp;
309 <  short int have_target_pressure;
310 <
304 >  double oldEta[3][3];
305 >  double prevEta[3][3];
306 >  double vScale[3][3];
307   };
308  
309 + template<typename T> class NPTxyz : public T{
310  
314 – template<typename T> class NPTpr : public T{
315 –
311   public:
312  
313 <  NPTpr ( SimInfo *theInfo, ForceFields* the_ff);
314 <  virtual ~NPTpr() {};
313 >  NPTxyz ( SimInfo *theInfo, ForceFields* the_ff);
314 >  virtual ~NPTxyz();
315  
316 <  virtual void integrateStep( int calcPot, int calcStress ){
317 <    calcStress = 1;
318 <    T::integrateStep( calcPot, calcStress );
324 <  }
316 >  virtual double getConservedQuantity(void);
317 >  virtual string getAdditionalParameters(void);
318 >  virtual void resetIntegrator(void);
319  
326 –  void setTauThermostat(double tt) {tauThermostat = tt; have_tau_thermostat=1;}
327 –  void setTauBarostat(double tb) {tauBarostat = tb; have_tau_barostat=1;}
328 –  void setTargetTemp(double tt) {targetTemp = tt; have_target_temp = 1;}
329 –  void setTargetPressure(double tp) {targetPressure = tp; have_target_pressure = 1;}
330 –
320   protected:
321  
322 <  virtual void  moveA( void );
323 <  virtual void moveB( void );
322 >  virtual void evolveEtaA(void);
323 >  virtual void evolveEtaB(void);
324  
325 <  virtual int readyCheck();
325 >  virtual bool etaConverged( void );
326  
327 <  virtual void resetIntegrator( void );
327 >  virtual void scaleSimBox( void );
328  
329 <  // chi and eta are the propagated degrees of freedom
329 >  virtual void getVelScaleA( double sc[3], double vel[3] );
330 >  virtual void getVelScaleB( double sc[3], int index );
331 >  virtual void getPosScale(double pos[3], double COM[3],
332 >                           int index, double sc[3]);
333  
334 <  double chi;
343 <  double eta[3][3];
344 <  double NkBT;
334 >  virtual void calcVelScale( void );
335  
336 <  // targetTemp, targetPressure, and tauBarostat must be set.  
337 <  // One of qmass or tauThermostat must be set;
338 <
339 <  double targetTemp;
350 <  double targetPressure;
351 <  double tauThermostat;
352 <  double tauBarostat;
353 <
354 <  short int have_tau_thermostat, have_tau_barostat, have_target_temp;
355 <  short int have_target_pressure;
356 <
336 >  double eta[3][3];
337 >  double oldEta[3][3];
338 >  double prevEta[3][3];
339 >  double vScale[3][3];
340   };
341  
342  
343   template<typename T> class ZConstraint : public T {
344 <  
345 <  public:
344 >
345 >  public:
346    class ForceSubtractionPolicy{
347      public:
348        ForceSubtractionPolicy(ZConstraint<T>* integrator) {zconsIntegrator = integrator;}
349  
350 <      virtual void update() = 0;    
350 >      virtual void update() = 0;
351        virtual double getZFOfFixedZMols(Molecule* mol, Atom* atom, double totalForce) = 0;
352        virtual double getZFOfMovingMols(Atom* atom, double totalForce) = 0;
353        virtual double getHFOfFixedZMols(Molecule* mol, Atom* atom, double totalForce) = 0;
354        virtual double getHFOfUnconsMols(Atom* atom, double totalForce) = 0;
355 <    
355 >
356     protected:
357 <     ZConstraint<T>* zconsIntegrator;;
357 >     ZConstraint<T>* zconsIntegrator;
358    };
359  
360    class PolicyByNumber : public ForceSubtractionPolicy{
361  
362      public:
363 <      PolicyByNumber(ZConstraint<T>* integrator) :ForceSubtractionPolicy(integrator) {}    
364 <      virtual void update();    
363 >      PolicyByNumber(ZConstraint<T>* integrator) :ForceSubtractionPolicy(integrator) {}
364 >      virtual void update();
365        virtual double getZFOfFixedZMols(Molecule* mol, Atom* atom, double totalForce) ;
366        virtual double getZFOfMovingMols(Atom* atom, double totalForce) ;
367        virtual double getHFOfFixedZMols(Molecule* mol, Atom* atom, double totalForce);
368        virtual double getHFOfUnconsMols(Atom* atom, double totalForce);
369 <    
369 >
370      private:
371 <    int totNumOfMovingAtoms;
371 >      int totNumOfMovingAtoms;
372    };
373  
374    class PolicyByMass : public ForceSubtractionPolicy{
375  
376      public:
377 <      PolicyByMass(ZConstraint<T>* integrator) :ForceSubtractionPolicy(integrator) {}  
378 <      
379 <      virtual void update();    
377 >      PolicyByMass(ZConstraint<T>* integrator) :ForceSubtractionPolicy(integrator) {}
378 >
379 >      virtual void update();
380        virtual double getZFOfFixedZMols(Molecule* mol, Atom* atom, double totalForce) ;
381        virtual double getZFOfMovingMols(Atom* atom, double totalForce) ;
382        virtual double getHFOfFixedZMols(Molecule* mol, Atom* atom, double totalForce);
# Line 407 | Line 390 | template<typename T> class ZConstraint : public T { (p
390  
391    ZConstraint( SimInfo *theInfo, ForceFields* the_ff);
392    ~ZConstraint();
393 <    
393 >
394    void setZConsTime(double time)                  {this->zconsTime = time;}
395    void getZConsTime()                             {return zconsTime;}
396 <  
396 >
397    void setIndexOfAllZConsMols(vector<int> index) {indexOfAllZConsMols = index;}
398    void getIndexOfAllZConsMols()                  {return indexOfAllZConsMols;}
399 <  
399 >
400    void setZConsOutput(const char * fileName)          {zconsOutput = fileName;}
401    string getZConsOutput()                         {return zconsOutput;}
402 <  
402 >
403    virtual void integrate();
421 –  
404  
405 +
406   #ifdef IS_MPI
407    virtual void update();                      //which is called to indicate the molecules' migration
408   #endif
409  
410 +  enum ZConsState {zcsMoving, zcsFixed};
411 +
412 +  vector<Molecule*> zconsMols;              //z-constraint molecules array
413 +  vector<ZConsState> states;                 //state of z-constraint molecules
414 +
415 +
416 +
417 +  int totNumOfUnconsAtoms;              //total number of uncontraint atoms
418 +  double totalMassOfUncons;                //total mas of unconstraint molecules
419 +
420 +
421   protected:
422  
423 <  enum ZConsState {zcsMoving, zcsFixed};  
424 <
425 <  virtual void calcForce( int calcPot, int calcStress );
423 >
424 >
425 >  virtual void calcForce( int calcPot, int calcStress );
426    virtual void thermalize(void);
427 <  
427 >
428    void zeroOutVel();
429    void doZconstraintForce();
430 <  void doHarmonic();
430 >  void doHarmonic(vector<double>& resPos);
431    bool checkZConsState();
432  
433    bool haveFixedZMols();
# Line 448 | Line 442 | template<typename T> class ZConstraint : public T { (p
442    double zconsTol;                                 //tolerance of z-contratint
443    double zForceConst;                           //base force constant term
444                                                            //which is estimate by OOPSE
445 <  
446 <  vector<Molecule*> zconsMols;              //z-constraint molecules array
447 <  vector<double> massOfZConsMols;       //mass of z-constraint molecule
445 >
446 >
447 >  vector<double> massOfZConsMols;       //mass of z-constraint molecule
448    vector<double> kz;                              //force constant array
449 <  vector<ZConsState> states;                 //state of z-constraint molecules
449 >
450    vector<double> zPos;                          //
451 <  
452 <  
451 >
452 >
453    vector<Molecule*> unconsMols;           //unconstraint molecules array
454    vector<double> massOfUnconsMols;    //mass array of unconstraint molecules
461 –  double totalMassOfUncons;                //total mas of unconstraint molecules
455  
456 +
457    vector<ZConsParaItem>* parameters; //
458 <  
458 >
459    vector<int> indexOfAllZConsMols;     //index of All Z-Constraint Molecuels
460  
461 <  int* indexOfZConsMols;                   //index of local Z-Constraint Molecules  
462 <  double* fz;
463 <  double* curZPos;
470 <  
471 <  int totNumOfUnconsAtoms;              //total number of uncontraint atoms
461 >  vector<int> indexOfZConsMols;                   //index of local Z-Constraint Molecules
462 >  vector<double> fz;
463 >  vector<double> curZPos;
464  
465 <  int whichDirection;                           //constraint direction
465 >  bool usingSMD;
466 >  vector<double> prevCantPos;
467 >  vector<double> cantPos;
468 >  vector<double> cantVel;
469 >
470 >  double zconsFixTime;  
471 >  double zconsGap;
472 >  bool hasZConsGap;
473 >  vector<double> endFixTime;
474    
475 +  int whichDirection;                           //constraint direction
476 +
477   private:
478 <  
478 >
479    string zconsOutput;                         //filename of zconstraint output
480    ZConsWriter* fzOut;                         //z-constraint writer
481  
482 <  double curZconsTime;                      
482 >  double curZconsTime;
483  
484    double calcMovingMolsCOMVel();
485    double calcSysCOMVel();
486    double calcTotalForce();
487 +  void updateZPos();
488 +  void updateCantPos();
489    
490    ForceSubtractionPolicy* forcePolicy; //force subtraction policy
491    friend class ForceSubtractionPolicy;
492  
493   };
494  
495 +
496 + //Sympletic quaternion Scheme Integrator
497 + //Reference:
498 + // T.F. Miller, M. Eleftheriou, P. Pattnaik, A. Ndirango, D. Newns and G.J. Martyna
499 + //Symplectic quaternion Scheme for biophysical molecular dynamics
500 + //116(20), 8649, J. Chem. Phys. (2002)
501 + template<typename T> class SQSIntegrator : public T{
502 +  public:
503 +    virtual void moveA();
504 +    virtual void moveB();
505 +  protected:
506 +    void freeRotor();
507 +    void rotate(int k, double dt);
508 +    
509 + };
510   #endif

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