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root/group/trunk/OOPSE/libmdtools/ZConstraint.cpp
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Comparing trunk/OOPSE/libmdtools/ZConstraint.cpp (file contents):
Revision 658 by tim, Thu Jul 31 15:35:07 2003 UTC vs.
Revision 1093 by tim, Wed Mar 17 14:22:59 2004 UTC

# Line 1 | Line 1
1 < #include "Integrator.hpp"
2 < #include "simError.h"
3 <
4 < template<typename T> ZConstraint<T>::ZConstraint(SimInfo* theInfo, ForceFields* the_ff)
5 <                                    : T(theInfo, the_ff), fz(NULL), indexOfZConsMols(NULL)
6 < {
7 <
8 <  //get properties from SimInfo
9 <  GenericData* data;
10 <  IndexData* index;
11 <  DoubleData* sampleTime;
12 <  StringData* filename;
13 <  
14 <  
15 <  data = info->getProperty("zconsindex");
16 <  if(!data) {
17 <
18 <    sprintf( painCave.errMsg,
19 <               "ZConstraint error: If you use an ZConstraint\n"
20 <               " , you must set index of z-constraint molecules.\n");
21 <    painCave.isFatal = 1;
22 <    simError();  
23 <  }
24 <  else{
25 <    index = dynamic_cast<IndexData*>(data);
26 <    
27 <    if(!index){
28 <
29 <      sprintf( painCave.errMsg,
30 <                 "ZConstraint error: Can not get property from SimInfo\n");
31 <      painCave.isFatal = 1;
32 <      simError();  
33 <    
34 <    }
35 <    else{
36 <      indexOfAllZConsMols = index->getIndexData();
37 <    }
38 <        
39 <  }
40 <  
41 <  //retrive sample time of z-contraint
42 <  data = info->getProperty("zconstime");
43 <  
44 <  if(!data) {
45 <      
46 <    sprintf( painCave.errMsg,
47 <               "ZConstraint error: If you use an ZConstraint\n"
48 <               " , you must set sample time.\n");
49 <    painCave.isFatal = 1;
50 <    simError();      
51 <  }
52 <  else{
53 <  
54 <    sampleTime = dynamic_cast<DoubleData*>(data);
55 <    
56 <    if(!sampleTime){
57 <
58 <      sprintf( painCave.errMsg,
59 <                 "ZConstraint error: Can not get property from SimInfo\n");
60 <      painCave.isFatal = 1;
61 <      simError();  
62 <      
63 <    }
64 <    else{
65 <      this->zconsTime = sampleTime->getData();
66 <    }
67 <
68 <  }
69 <  
70 <  
71 <  //retrive output filename of z force
72 <  data = info->getProperty("zconsfilename");
73 <  if(!data) {
74 <
75 <      
76 <    sprintf( painCave.errMsg,
77 <               "ZConstraint error: If you use an ZConstraint\n"
78 <               " , you must set output filename of z-force.\n");
79 <    painCave.isFatal = 1;
80 <    simError();  
81 <
82 <  }
83 <  else{
84 <
85 <     filename = dynamic_cast<StringData*>(data);
86 <    
87 <    if(!filename){
88 <
89 <      sprintf( painCave.errMsg,
90 <                 "ZConstraint error: Can not get property from SimInfo\n");
91 <      painCave.isFatal = 1;
92 <      simError();  
93 <        
94 <    }
95 <    else{
96 <      this->zconsOutput = filename->getData();
97 <    }
98 <    
99 <
100 <  }
101 <
102 <
103 <  //calculate reference z coordinate for z-constraint molecules
104 <  double totalMass_local;
105 <  double totalMass;
106 <  double totalMZ_local;
107 <  double totalMZ;
108 <  double massOfUncons_local;
109 <  double massOfCurMol;
110 <  double COM[3];
111 <  
112 <  totalMass_local = 0;
113 <  totalMass = 0;
114 <  totalMZ_local = 0;
115 <  totalMZ = 0;
116 <  massOfUncons_local = 0;
117 <    
118 <  
119 <  for(int i = 0; i < nMols; i++){
120 <    massOfCurMol = molecules[i].getTotalMass();
121 <    molecules[i].getCOM(COM);
122 <    
123 <    totalMass_local += massOfCurMol;
124 <    totalMZ_local += massOfCurMol * COM[2];
125 <    
126 <    if(isZConstraintMol(&molecules[i]) == -1){
127 <    
128 <      massOfUncons_local += massOfCurMol;
129 <    }  
130 <    
131 <  }
132 <  
133 <  
134 < #ifdef IS_MPI  
135 <  MPI_Allreduce(&totalMass_local, &totalMass, 1, MPI_DOUBLE,MPI_SUM, MPI_COMM_WORLD);
136 <  MPI_Allreduce(&totalMZ_local, &totalMZ, 1, MPI_DOUBLE,MPI_SUM, MPI_COMM_WORLD);  
137 <  MPI_Allreduce(&massOfUncons_local, &totalMassOfUncons, 1, MPI_DOUBLE,MPI_SUM, MPI_COMM_WORLD);
138 < #else
139 <  totalMass = totalMass_local;
140 <  totalMZ = totalMZ_local;
141 <  totalMassOfUncons = massOfUncons_local;
142 < #endif  
143 <
144 <  double zsys;
145 <  zsys = totalMZ / totalMass;
146 <
147 < #ifndef IS_MPI  
148 <  for(int i = 0; i < nMols; i++){
149 <    
150 <    if(isZConstraintMol(&molecules[i]) > -1 ){
151 <      molecules[i].getCOM(COM);
152 <      allRefZ.push_back(COM[2] - zsys);  
153 <    }
154 <    
155 <  }
156 < #else
157 <
158 <  int whichNode;
159 <  enum CommType { RequestMolZPos, EndOfRequest} status;
160 <  //int status;
161 <  double zpos;
162 <  int localIndex;
163 <  MPI_Status ierr;
164 <  int tag = 0;
165 <  
166 <  if(worldRank == 0){
167 <    
168 <    int globalIndexOfCurMol;
169 <    int *MolToProcMap;
170 <    MolToProcMap = mpiSim->getMolToProcMap();
171 <    
172 <    for(int i = 0; i < indexOfAllZConsMols.size(); i++){
173 <      
174 <      whichNode = MolToProcMap[indexOfAllZConsMols[i]];
175 <      globalIndexOfCurMol = indexOfAllZConsMols[i];
176 <      
177 <      if(whichNode == 0){
178 <        
179 <        for(int j = 0; j < nMols; j++)
180 <          if(molecules[j].getGlobalIndex() == globalIndexOfCurMol){
181 <            localIndex = j;
182 <            break;
183 <          }
184 <                  
185 <        molecules[localIndex].getCOM(COM);
186 <        allRefZ.push_back(COM[2] - zsys);  
187 <              
188 <      }
189 <      else{
190 <        status = RequestMolZPos;
191 <        MPI_Send(&status, 1, MPI_INT, whichNode, tag, MPI_COMM_WORLD);
192 <        MPI_Send(&globalIndexOfCurMol, 1, MPI_INT, whichNode, tag, MPI_COMM_WORLD);
193 <        MPI_Recv(&zpos, 1, MPI_DOUBLE_PRECISION, whichNode, tag, MPI_COMM_WORLD, &ierr);
194 <        
195 <        allRefZ.push_back(zpos - zsys);
196 <      
197 <      }
198 <              
199 <    } //End of Request Loop
200 <    
201 <    //Send ending request message to slave nodes    
202 <    status = EndOfRequest;
203 <    for(int i =1; i < mpiSim->getNumberProcessors(); i++)
204 <      MPI_Send(&status, 1, MPI_INT, i, tag, MPI_COMM_WORLD);
205 <    
206 <  }
207 <  else{
208 <  
209 <    int whichMol;
210 <    bool done = false;
211 <
212 <    while (!done){  
213 <      
214 <      MPI_Recv(&status, 1, MPI_INT, 0, tag, MPI_COMM_WORLD, &ierr);
215 <    
216 <      switch (status){
217 <          
218 <        case RequestMolZPos :
219 <          
220 <          MPI_Recv(&whichMol, 1, MPI_INT, 0, tag, MPI_COMM_WORLD,&ierr);
221 <          
222 <          for(int i = 0; i < nMols; i++)
223 <            if(molecules[i].getGlobalIndex() == whichMol){
224 <              localIndex = i;
225 <              break;
226 <            }
227 <          
228 <          molecules[localIndex].getCOM(COM);
229 <          zpos = COM[2];          
230 <          MPI_Send(&zpos, 1, MPI_DOUBLE_PRECISION, 0, tag, MPI_COMM_WORLD);      
231 <          
232 <          break;
233 <            
234 <        case EndOfRequest :
235 <        
236 <         done = true;
237 <         break;
238 <      }
239 <      
240 <    }
241 <          
242 <  }
243 <
244 <  //Brocast the allRefZ to slave nodes;
245 <  double* allRefZBuf;
246 <  int nZConsMols;
247 <  nZConsMols = indexOfAllZConsMols.size();
248 <  
249 <  allRefZBuf = new double[nZConsMols];
250 <  
251 <  if(worldRank == 0){
252 <
253 <    for(int i = 0; i < nZConsMols; i++)
254 <      allRefZBuf[i] = allRefZ[i];
255 <  }    
256 <  
257 <    MPI_Bcast(allRefZBuf, nZConsMols, MPI_DOUBLE_PRECISION, 0, MPI_COMM_WORLD);
258 <  
259 <  if(worldRank != 0){
260 <    
261 <    for(int i = 0; i < nZConsMols; i++)
262 <      allRefZ.push_back(allRefZBuf[i]);  
263 <  }
264 <  
265 <  delete[] allRefZBuf;
266 < #endif
267 <
268 <  
269 < #ifdef IS_MPI
270 <  update();
271 < #else  
272 <  int searchResult;
273 <  
274 <  refZ = allRefZ;
275 <
276 <  for(int i = 0; i < nMols; i++){
277 <    
278 <    searchResult = isZConstraintMol(&molecules[i]);
279 <    
280 <    if(searchResult > -1){
281 <    
282 <      zconsMols.push_back(&molecules[i]);      
283 <      massOfZConsMols.push_back(molecules[i].getTotalMass());  
284 <      
285 <      molecules[i].getCOM(COM);
286 <    }
287 <    else
288 <    {
289 <    
290 <      unconsMols.push_back(&molecules[i]);
291 <      massOfUnconsMols.push_back(molecules[i].getTotalMass());
292 <
293 <    }
294 <  }
295 <
296 <  fz = new double[zconsMols.size()];
297 <  indexOfZConsMols = new int [zconsMols.size()];
298 <
299 <  if(!fz || !indexOfZConsMols){
300 <    sprintf( painCave.errMsg,
301 <             "Memory allocation failure in class Zconstraint\n");
302 <    painCave.isFatal = 1;
303 <    simError();
304 <  }
305 <
306 <  for(int i = 0; i < zconsMols.size(); i++)
307 <    indexOfZConsMols[i] = zconsMols[i]->getGlobalIndex();
308 <  
309 < #endif
310 <  
311 <  fzOut = new ZConsWriter(zconsOutput.c_str());  
312 <  
313 <  if(!fzOut){
314 <    sprintf( painCave.errMsg,
315 <             "Memory allocation failure in class Zconstraint\n");
316 <    painCave.isFatal = 1;
317 <    simError();
318 <  }
319 <  
320 <  fzOut->writeRefZ(indexOfAllZConsMols, allRefZ);
321 < }
322 <
323 < template<typename T> ZConstraint<T>::~ZConstraint()
324 < {
325 <  if(fz)
326 <    delete[] fz;
327 <  
328 <  if(indexOfZConsMols)
329 <    delete[] indexOfZConsMols;
330 <  
331 <  if(fzOut)
332 <    delete fzOut;
333 < }
334 <
335 < #ifdef IS_MPI
336 < template<typename T> void ZConstraint<T>::update()
337 < {
338 <  double COM[3];
339 <  int index;
340 <  
341 <  zconsMols.clear();
342 <  massOfZConsMols.clear();
343 <  refZ.clear();
344 <  
345 <  unconsMols.clear();
346 <  massOfUnconsMols.clear();
347 <
348 <
349 <  //creat zconsMol and unconsMol lists
350 <  for(int i = 0; i < nMols; i++){
351 <    
352 <    index = isZConstraintMol(&molecules[i]);
353 <    
354 <    if(index > -1){
355 <    
356 <      zconsMols.push_back(&molecules[i]);      
357 <      massOfZConsMols.push_back(molecules[i].getTotalMass());  
358 <      
359 <      molecules[i].getCOM(COM);
360 <      refZ.push_back(allRefZ[index]);      
361 <    }
362 <    else
363 <    {
364 <    
365 <      unconsMols.push_back(&molecules[i]);
366 <      massOfUnconsMols.push_back(molecules[i].getTotalMass());
367 <
368 <    }
369 <  }
370 <    
371 <  //The reason to declare fz and indexOfZconsMols as pointer to array is
372 <  // that we want to make the MPI communication simple
373 <  if(fz)
374 <    delete[] fz;
375 <    
376 <  if(indexOfZConsMols)
377 <    delete[] indexOfZConsMols;
378 <    
379 <  if (zconsMols.size() > 0){
380 <    fz = new double[zconsMols.size()];
381 <    indexOfZConsMols =  new int[zconsMols.size()];
382 <    
383 <    if(!fz || !indexOfZConsMols){
384 <      sprintf( painCave.errMsg,
385 <               "Memory allocation failure in class Zconstraint\n");
386 <      painCave.isFatal = 1;
387 <      simError();
388 <    }
389 <        
390 <    for(int i = 0; i < zconsMols.size(); i++){
391 <      indexOfZConsMols[i] = zconsMols[i]->getGlobalIndex();
392 <    }
393 <
394 <  }
395 <  else{
396 <    fz = NULL;
397 <    indexOfZConsMols = NULL;
398 <  }
399 <  
400 < }
401 <
402 < #endif
403 <
404 < /**  Function Name: isZConstraintMol
405 < **  Parameter
406 < **    Molecule* mol
407 < **  Return value:
408 < **    -1, if the molecule is not z-constraint molecule,
409 < **    other non-negative values, its index in indexOfAllZConsMols vector
410 < */
411 <
412 < template<typename T> int ZConstraint<T>::isZConstraintMol(Molecule* mol)
413 < {
414 <  int index;
415 <  int low;
416 <  int high;
417 <  int mid;
418 <
419 <  index = mol->getGlobalIndex();
420 <  
421 <  low = 0;
422 <  high = indexOfAllZConsMols.size() - 1;
423 <  
424 <  //Binary Search (we have sorted the array)  
425 <  while(low <= high){
426 <    mid = (low + high) /2;
427 <    if (indexOfAllZConsMols[mid] == index)
428 <      return mid;
429 <    else if (indexOfAllZConsMols[mid] > index )
430 <       high = mid -1;
431 <    else    
432 <      low = mid + 1;
433 <  }
434 <  
435 <  return -1;
436 < }
437 <
438 < /** Function Name: integrateStep
439 < ** Parameter:
440 < **   int calcPot;
441 < **   int calcStress;
442 < ** Description:
443 < **  Advance One Step.
444 < ** Memo:
445 < **   The best way to implement z-constraint is to override integrateStep
446 < **   Overriding constrainB is not a good choice, since in integrateStep,
447 < **   constrainB is invoked by below line,
448 < **                  if(nConstrained) constrainB();
449 < **   For instance, we would like to apply z-constraint without bond contrain,
450 < **   In that case, if we override constrainB, Z-constrain method will never be executed;
451 < */
452 < template<typename T> void ZConstraint<T>::integrateStep( int calcPot, int calcStress )
453 < {
454 <  T::integrateStep( calcPot, calcStress );
455 <  resetZ();
456 <  
457 <  double currZConsTime = 0;
458 <  
459 <  //write out forces of z constraint
460 <  if( info->getTime() >= currZConsTime){  
461 <      fzOut->writeFZ(info->getTime(), zconsMols.size(),indexOfZConsMols, fz);
462 <  }    
463 < }
464 <
465 < /** Function Name: resetZ
466 < ** Description:
467 < **  Reset the z coordinates
468 < */
469 <
470 < template<typename T> void ZConstraint<T>::resetZ()
471 < {
472 <  double deltaZ;
473 <  double mzOfZCons;   //total sum of m*z of z-constrain molecules
474 <  double mzOfUncons; //total sum of m*z of unconstrain molecuels;
475 <  double totalMZOfZCons;
476 <  double totalMZOfUncons;
477 <  double COM[3];
478 <  double zsys;
479 <  Atom** zconsAtoms;
480 <
481 <  mzOfZCons = 0;
482 <  mzOfUncons  = 0;
483 <  
484 <  for(int i = 0; i < zconsMols.size(); i++){
485 <    mzOfZCons += massOfZConsMols[i] * refZ[i];    
486 <  }
487 <
488 < #ifdef IS_MPI
489 <  MPI_Allreduce(&mzOfZCons, &totalMZOfZCons, 1,MPI_DOUBLE,MPI_SUM, MPI_COMM_WORLD);
490 < #else
491 <  totalMZOfZCons = mzOfZCons;
492 < #endif
493 <
494 <  for(int i = 0; i < unconsMols.size(); i++){
495 <    unconsMols[i]->getCOM(COM);
496 <    mzOfUncons += massOfUnconsMols[i] * COM[2];
497 <  }
498 <  
499 < #ifdef IS_MPI
500 <  MPI_Allreduce(&mzOfUncons, &totalMZOfUncons, 1,MPI_DOUBLE,MPI_SUM, MPI_COMM_WORLD);
501 < #else
502 <  totalMZOfUncons = mzOfUncons;
503 < #endif  
504 <  
505 <  zsys = (totalMZOfZCons + totalMZOfUncons) /totalMassOfUncons;
506 <
507 <  cout << "current time: " << info->getTime() <<endl;  
508 <  for(int i = 0; i < zconsMols.size(); i++){  
509 <  
510 <    zconsMols[i]->getCOM(COM);
511 <    
512 <    cout << "global index: " << zconsMols[i]->getGlobalIndex() << "\tZ: " << COM[2] << "\t";
513 <    deltaZ = zsys + refZ[i] - COM[2];
514 <    cout << "\tdistance: " << COM[2] +deltaZ - zsys;    
515 <    //update z coordinate    
516 <    zconsAtoms = zconsMols[i]->getMyAtoms();    
517 <    for(int j =0; j < zconsMols[i]->getNAtoms(); j++){
518 <      zconsAtoms[j]->setZ(zconsAtoms[j]->getZ() + deltaZ);  
519 <    }    
520 <    
521 <    //calculate z constrain force
522 <    fz[i] = massOfZConsMols[i]* deltaZ / dt2;
523 <    
524 <    cout << "\tforce: " << fz[i] << endl;
525 <  }
526 <
527 <      
528 < }
1 > #include "Integrator.hpp"
2 > #include "simError.h"
3 > #include <math.h>
4 >
5 > const double INFINITE_TIME = 10e30;
6 > template<typename T> ZConstraint<T>::ZConstraint(SimInfo* theInfo,
7 >                                                 ForceFields* the_ff): T(theInfo, the_ff),
8 >                                                                       fzOut(NULL),
9 >                                                                       curZconsTime(0),
10 >                                                                       forcePolicy(NULL),
11 >                                                                       usingSMD(false),
12 >                                                                       hasZConsGap(false){
13 >  //get properties from SimInfo
14 >  GenericData* data;
15 >  ZConsParaData* zConsParaData;
16 >  DoubleData* sampleTime;
17 >  DoubleData* tolerance;
18 >  DoubleData* gap;
19 >  DoubleData* fixtime;
20 >  StringData* policy;
21 >  StringData* filename;
22 >  IntData* smdFlag;
23 >  double COM[3];
24 >
25 >  //by default, the direction of constraint is z
26 >  // 0 --> x
27 >  // 1 --> y
28 >  // 2 --> z
29 >  whichDirection = 2;
30 >
31 >  //estimate the force constant of harmonical potential
32 >  double Kb = 1.986E-3 ; //in kcal/K
33 >
34 >  double halfOfLargestBox = max(info->boxL[0], max(info->boxL[1], info->boxL[2])) /
35 >                            2;
36 >  zForceConst = Kb * info->target_temp / (halfOfLargestBox * halfOfLargestBox);
37 >
38 >  //creat force Subtraction policy
39 >  data = info->getProperty(ZCONSFORCEPOLICY_ID);
40 >  if (!data){
41 >    sprintf(painCave.errMsg,
42 >            "ZConstraint Warning: User does not set force Subtraction policy, "
43 >            "PolicyByMass is used\n");
44 >    painCave.isFatal = 0;
45 >    simError();      
46 >
47 >    forcePolicy = (ForceSubtractionPolicy *) new PolicyByMass(this);
48 >  }
49 >  else{
50 >    policy = dynamic_cast<StringData*>(data);
51 >
52 >    if (!policy){
53 >      sprintf(painCave.errMsg,
54 >              "ZConstraint Error: Convertion from GenericData to StringData failure, "
55 >              "PolicyByMass is used\n");
56 >      painCave.isFatal = 0;
57 >      simError();      
58 >
59 >      forcePolicy = (ForceSubtractionPolicy *) new PolicyByMass(this);
60 >    }
61 >    else{
62 >      if (policy->getData() == "BYNUMBER")
63 >        forcePolicy = (ForceSubtractionPolicy *) new PolicyByNumber(this);
64 >      else if (policy->getData() == "BYMASS")
65 >        forcePolicy = (ForceSubtractionPolicy *) new PolicyByMass(this);
66 >      else{
67 >        sprintf(painCave.errMsg,
68 >                "ZConstraint Warning: unknown force Subtraction policy, "
69 >                "PolicyByMass is used\n");
70 >        painCave.isFatal = 0;
71 >        simError();      
72 >        forcePolicy = (ForceSubtractionPolicy *) new PolicyByMass(this);
73 >      }
74 >    }
75 >  }
76 >
77 >
78 >  //retrieve sample time of z-contraint
79 >  data = info->getProperty(ZCONSTIME_ID);
80 >
81 >  if (!data){
82 >    sprintf(painCave.errMsg,
83 >            "ZConstraint error: If you use an ZConstraint\n"
84 >            " , you must set sample time.\n");
85 >    painCave.isFatal = 1;
86 >    simError();
87 >  }
88 >  else{
89 >    sampleTime = dynamic_cast<DoubleData*>(data);
90 >
91 >    if (!sampleTime){
92 >      sprintf(painCave.errMsg,
93 >              "ZConstraint error: Can not get property from SimInfo\n");
94 >      painCave.isFatal = 1;
95 >      simError();
96 >    }
97 >    else{
98 >      this->zconsTime = sampleTime->getData();
99 >    }
100 >  }
101 >
102 >  //retrieve output filename of z force
103 >  data = info->getProperty(ZCONSFILENAME_ID);
104 >  if (!data){
105 >    sprintf(painCave.errMsg,
106 >            "ZConstraint error: If you use an ZConstraint\n"
107 >            " , you must set output filename of z-force.\n");
108 >    painCave.isFatal = 1;
109 >    simError();
110 >  }
111 >  else{
112 >    filename = dynamic_cast<StringData*>(data);
113 >
114 >    if (!filename){
115 >      sprintf(painCave.errMsg,
116 >              "ZConstraint error: Can not get property from SimInfo\n");
117 >      painCave.isFatal = 1;
118 >      simError();
119 >    }
120 >    else{
121 >      this->zconsOutput = filename->getData();
122 >    }
123 >  }
124 >
125 >  //retrieve tolerance for z-constraint molecuels
126 >  data = info->getProperty(ZCONSTOL_ID);
127 >
128 >  if (!data){
129 >    sprintf(painCave.errMsg, "ZConstraint error: can not get tolerance \n");
130 >    painCave.isFatal = 1;
131 >    simError();
132 >  }
133 >  else{
134 >    tolerance = dynamic_cast<DoubleData*>(data);
135 >
136 >    if (!tolerance){
137 >      sprintf(painCave.errMsg,
138 >              "ZConstraint error: Can not get property from SimInfo\n");
139 >      painCave.isFatal = 1;
140 >      simError();
141 >    }
142 >    else{
143 >      this->zconsTol = tolerance->getData();
144 >    }
145 >  }
146 >
147 >  //quick hack here
148 >  data = info->getProperty(ZCONSGAP_ID);
149 >
150 >  if (data){
151 >    gap = dynamic_cast<DoubleData*>(data);
152 >
153 >    if (!gap){
154 >      sprintf(painCave.errMsg,
155 >              "ZConstraint error: Can not get property from SimInfo\n");
156 >      painCave.isFatal = 1;
157 >      simError();
158 >    }
159 >    else{
160 >      this->hasZConsGap = true;
161 >      this->zconsGap = gap->getData();
162 >    }
163 >  }
164 >
165 >
166 >
167 >  data = info->getProperty(ZCONSFIXTIME_ID);
168 >
169 >  if (data){
170 >    fixtime = dynamic_cast<DoubleData*>(data);
171 >    if (!fixtime){
172 >      sprintf(painCave.errMsg,
173 >              "ZConstraint error: Can not get zconsFixTime from SimInfo\n");
174 >      painCave.isFatal = 1;
175 >      simError();
176 >    }
177 >    else{
178 >      this->zconsFixTime = fixtime->getData();
179 >    }
180 >  }
181 >  else if(hasZConsGap){
182 >      sprintf(painCave.errMsg,
183 >              "ZConstraint error: must set fixtime if already set zconsGap\n");
184 >      painCave.isFatal = 1;
185 >      simError();
186 >  }
187 >
188 >
189 >
190 >  data = info->getProperty(ZCONSUSINGSMD_ID);
191 >
192 >  if (data){
193 >    smdFlag = dynamic_cast<IntData*>(data);
194 >
195 >    if (!smdFlag){
196 >      sprintf(painCave.errMsg,
197 >              "ZConstraint error: Can not get property from SimInfo\n");
198 >      painCave.isFatal = 1;
199 >      simError();
200 >    }
201 >    else{
202 >      this->usingSMD= smdFlag->getData() ? true : false;
203 >    }
204 >
205 >  }
206 >
207 >
208 >
209 >  //retrieve index of z-constraint molecules
210 >  data = info->getProperty(ZCONSPARADATA_ID);
211 >  if (!data){
212 >    sprintf(painCave.errMsg,
213 >            "ZConstraint error: If you use an ZConstraint\n"
214 >            " , you must set index of z-constraint molecules.\n");
215 >    painCave.isFatal = 1;
216 >    simError();
217 >  }
218 >  else{
219 >    zConsParaData = dynamic_cast<ZConsParaData*>(data);
220 >
221 >    if (!zConsParaData){
222 >      sprintf(painCave.errMsg,
223 >              "ZConstraint error: Can not get parameters of zconstraint method from SimInfo\n");
224 >      painCave.isFatal = 1;
225 >      simError();
226 >    }
227 >    else{
228 >      parameters = zConsParaData->getData();
229 >
230 >      //check the range of zconsIndex
231 >      //and the minimum value of index is the first one (we already sorted the data)
232 >      //the maximum value of index is the last one
233 >
234 >      int maxIndex;
235 >      int minIndex;
236 >      int totalNumMol;
237 >
238 >      minIndex = (*parameters)[0].zconsIndex;
239 >      if (minIndex < 0){
240 >        sprintf(painCave.errMsg, "ZConstraint error: index is out of range\n");
241 >        painCave.isFatal = 1;
242 >        simError();
243 >      }
244 >
245 >      maxIndex = (*parameters)[parameters->size() - 1].zconsIndex;
246 >
247 > #ifndef IS_MPI
248 >      totalNumMol = nMols;
249 > #else
250 >      totalNumMol = mpiSim->getTotNmol();  
251 > #endif      
252 >
253 >      if (maxIndex > totalNumMol - 1){
254 >        sprintf(painCave.errMsg, "ZConstraint error: index is out of range\n");
255 >        painCave.isFatal = 1;
256 >        simError();
257 >      }
258 >
259 >      //if user does not specify the zpos for the zconstraint molecule
260 >      //its initial z coordinate  will be used as default
261 >      for (int i = 0; i < (int) (parameters->size()); i++){
262 >        if (!(*parameters)[i].havingZPos){
263 > #ifndef IS_MPI
264 >          for (int j = 0; j < nMols; j++){
265 >            if (molecules[j].getGlobalIndex() == (*parameters)[i].zconsIndex){
266 >              molecules[j].getCOM(COM);
267 >              break;
268 >            }
269 >          }
270 > #else
271 >          //query which processor current zconstraint molecule belongs to
272 >          int* MolToProcMap;
273 >          int whichNode;
274 >
275 >          MolToProcMap = mpiSim->getMolToProcMap();
276 >          whichNode = MolToProcMap[(*parameters)[i].zconsIndex];
277 >
278 >          //broadcast the zpos of current z-contraint molecule
279 >          //the node which contain this
280 >
281 >          if (worldRank == whichNode){
282 >            for (int j = 0; j < nMols; j++)
283 >              if (molecules[j].getGlobalIndex() == (*parameters)[i].zconsIndex){
284 >                molecules[j].getCOM(COM);
285 >                break;
286 >              }
287 >          }
288 >
289 >          MPI_Bcast(&COM[whichDirection], 1, MPI_DOUBLE, whichNode,
290 >                    MPI_COMM_WORLD);        
291 > #endif
292 >
293 >          (*parameters)[i].zPos = COM[whichDirection];
294 >
295 >          sprintf(painCave.errMsg,
296 >                  "ZConstraint warning: Does not specify zpos for z-constraint molecule "
297 >                  "initial z coornidate will be used \n");
298 >          painCave.isFatal = 0;
299 >          simError();
300 >        }
301 >      }
302 >    }//end if (!zConsParaData)
303 >
304 >  }//end  if (!data)
305 >
306 >  //  
307 > #ifdef IS_MPI
308 >  update();
309 > #else  
310 >  int searchResult;
311 >
312 >  for (int i = 0; i < nMols; i++){
313 >    searchResult = isZConstraintMol(&molecules[i]);
314 >
315 >    if (searchResult > -1){
316 >      zconsMols.push_back(&molecules[i]);      
317 >      massOfZConsMols.push_back(molecules[i].getTotalMass());  
318 >
319 >      zPos.push_back((*parameters)[searchResult].zPos);
320 >      kz.push_back((*parameters)[searchResult]. kRatio * zForceConst);
321 >      
322 >      if(usingSMD)
323 >        cantVel.push_back((*parameters)[searchResult].cantVel);
324 >
325 >    }
326 >    else{
327 >      unconsMols.push_back(&molecules[i]);
328 >      massOfUnconsMols.push_back(molecules[i].getTotalMass());
329 >    }
330 >  }
331 >
332 >  fz.resize(zconsMols.size());
333 >  curZPos.resize(zconsMols.size());
334 >  indexOfZConsMols.resize(zconsMols.size());  
335 >
336 >  //determine the states of z-constraint molecules
337 >  for (size_t i = 0; i < zconsMols.size(); i++){
338 >    indexOfZConsMols[i] = zconsMols[i]->getGlobalIndex();
339 >
340 >    zconsMols[i]->getCOM(COM);
341 >    
342 >    if (fabs(zPos[i] - COM[whichDirection]) < zconsTol){
343 >      states.push_back(zcsFixed);
344 >
345 >      if (hasZConsGap)
346 >        endFixTime.push_back(info->getTime() + zconsFixTime);
347 >    }
348 >    else{
349 >      states.push_back(zcsMoving);
350 >
351 >      if (hasZConsGap)
352 >        endFixTime.push_back(INFINITE_TIME);
353 >    }
354 >
355 >    if(usingSMD)
356 >      cantPos.push_back(COM[whichDirection]);    
357 >  }
358 >
359 > #endif
360 >
361 >  
362 >  //get total masss of unconstraint molecules
363 >  double totalMassOfUncons_local;
364 >  totalMassOfUncons_local = 0;
365 >
366 >  for (size_t i = 0; i < unconsMols.size(); i++)
367 >    totalMassOfUncons_local += unconsMols[i]->getTotalMass();
368 >
369 > #ifndef IS_MPI
370 >  totalMassOfUncons = totalMassOfUncons_local;
371 > #else
372 >  MPI_Allreduce(&totalMassOfUncons_local, &totalMassOfUncons, 1, MPI_DOUBLE,
373 >                MPI_SUM, MPI_COMM_WORLD);  
374 > #endif
375 >
376 >  //get total number of unconstrained atoms
377 >  int nUnconsAtoms_local;
378 >  nUnconsAtoms_local = 0;
379 >  for (int i = 0; i < (int) (unconsMols.size()); i++)
380 >    nUnconsAtoms_local += unconsMols[i]->getNAtoms();
381 >
382 > #ifndef IS_MPI
383 >  totNumOfUnconsAtoms = nUnconsAtoms_local;
384 > #else
385 >  MPI_Allreduce(&nUnconsAtoms_local, &totNumOfUnconsAtoms, 1, MPI_INT, MPI_SUM,
386 >                MPI_COMM_WORLD);  
387 > #endif  
388 >
389 >  forcePolicy->update();
390 > }
391 >
392 > template<typename T> ZConstraint<T>::~ZConstraint(){
393 >
394 >  if (fzOut){
395 >    delete fzOut;
396 >  }
397 >
398 >  if (forcePolicy){
399 >    delete forcePolicy;
400 >  }
401 > }
402 >
403 >
404 > /**
405 > *
406 > */
407 >
408 > #ifdef IS_MPI
409 > template<typename T> void ZConstraint<T>::update(){
410 >  double COM[3];
411 >  int index;
412 >
413 >  zconsMols.clear();
414 >  massOfZConsMols.clear();
415 >  zPos.clear();
416 >  kz.clear();
417 >  cantPos.clear();
418 >  cantVel.clear();
419 >
420 >  unconsMols.clear();
421 >  massOfUnconsMols.clear();
422 >
423 >
424 >  //creat zconsMol and unconsMol lists
425 >  for (int i = 0; i < nMols; i++){
426 >    index = isZConstraintMol(&molecules[i]);
427 >
428 >    if (index > -1){
429 >      zconsMols.push_back(&molecules[i]);      
430 >      zPos.push_back((*parameters)[index].zPos);
431 >      kz.push_back((*parameters)[index].kRatio * zForceConst);
432 >      massOfZConsMols.push_back(molecules[i].getTotalMass());
433 >      
434 >      if(usingSMD)
435 >        cantVel.push_back((*parameters)[index].cantVel);
436 >
437 >    }
438 >    else{
439 >      unconsMols.push_back(&molecules[i]);
440 >      massOfUnconsMols.push_back(molecules[i].getTotalMass());
441 >    }
442 >  }
443 >
444 >  fz.resize(zconsMols.size());
445 >  curZPos.resize(zconsMols.size());
446 >  indexOfZConsMols.resize(zconsMols.size());  
447 >
448 >  for (size_t i = 0; i < zconsMols.size(); i++){
449 >    indexOfZConsMols[i] = zconsMols[i]->getGlobalIndex();
450 >  }
451 >    
452 >  //determine the states of z-constraint molecules
453 >  for (int i = 0; i < (int) (zconsMols.size()); i++){
454 >
455 >    zconsMols[i]->getCOM(COM);
456 >    
457 >    if (fabs(zPos[i] - COM[whichDirection]) < zconsTol){
458 >      states.push_back(zcsFixed);
459 >
460 >      if (hasZConsGap)
461 >        endFixTime.push_back(info->getTime() + zconsFixTime);
462 >    }
463 >    else{
464 >      states.push_back(zcsMoving);
465 >
466 >      if (hasZConsGap)
467 >        endFixTime.push_back(INFINITE_TIME);
468 >    }
469 >
470 >    if(usingSMD)
471 >      cantPos.push_back(COM[whichDirection]);        
472 >  }
473 >  //
474 >  forcePolicy->update();
475 > }
476 >
477 > #endif
478 >
479 > /**
480 > *  Function Name: isZConstraintMol
481 > *  Parameter
482 > *    Molecule* mol
483 > *  Return value:
484 > *    -1, if the molecule is not z-constraint molecule,
485 > *    other non-negative values, its index in indexOfAllZConsMols vector
486 > */
487 >
488 > template<typename T> int ZConstraint<T>::isZConstraintMol(Molecule* mol){
489 >  int index;
490 >  int low;
491 >  int high;
492 >  int mid;
493 >
494 >  index = mol->getGlobalIndex();
495 >
496 >  low = 0;
497 >  high = parameters->size() - 1;
498 >
499 >  //Binary Search (we have sorted the array)  
500 >  while (low <= high){
501 >    mid = (low + high) / 2;
502 >    if ((*parameters)[mid].zconsIndex == index)
503 >      return mid;
504 >    else if ((*parameters)[mid].zconsIndex > index)
505 >      high = mid - 1;
506 >    else
507 >      low = mid + 1;
508 >  }
509 >
510 >  return -1;
511 > }
512 >
513 > template<typename T> void ZConstraint<T>::integrate(){
514 >  // creat zconsWriter  
515 >  fzOut = new ZConsWriter(zconsOutput.c_str(), parameters);  
516 >
517 >  if (!fzOut){
518 >    sprintf(painCave.errMsg, "Memory allocation failure in class Zconstraint\n");
519 >    painCave.isFatal = 1;
520 >    simError();
521 >  }
522 >
523 >  //zero out the velocities of center of mass of unconstrained molecules
524 >  //and the velocities of center of mass of every single z-constrained molecueles
525 >  zeroOutVel();
526 >
527 >  curZconsTime = zconsTime + info->getTime();
528 >
529 >  T::integrate();
530 > }
531 >
532 >
533 > /**
534 > *
535 > *
536 > *
537 > *
538 > */
539 > template<typename T> void ZConstraint<T>::calcForce(int calcPot, int calcStress){
540 >  double zsys;
541 >  double COM[3];
542 >  double force[3];
543 >  double zSysCOMVel;
544 >
545 >  T::calcForce(calcPot, calcStress);
546 >
547 >
548 >  if (hasZConsGap){
549 >    updateZPos();
550 >  }
551 >
552 >  if (checkZConsState()){
553 >    zeroOutVel();    
554 >    forcePolicy->update();
555 >  }  
556 >
557 >  zsys = calcZSys();
558 >  zSysCOMVel = calcSysCOMVel();
559 > #ifdef IS_MPI
560 >  if (worldRank == 0){
561 > #endif
562 >    //cout << "---------------------------------------------------------------------" <<endl;
563 >    //cout << "current time: " << info->getTime() << endl;
564 >    //cout << "center of mass at z: " << zsys << endl;    
565 >    //cout << "before calcForce, the COMVel of system is " << zSysCOMVel <<endl;
566 >
567 > #ifdef IS_MPI
568 >  }
569 > #endif
570 >
571 >  //do zconstraint force;
572 >  if (haveFixedZMols()){
573 >    this->doZconstraintForce();
574 >  }
575 >
576 >  //use external force to move the molecules to the specified positions
577 >  if (haveMovingZMols()){
578 >    if (usingSMD)
579 >      this->doHarmonic(cantPos);
580 >    else
581 >      this->doHarmonic(zPos);      
582 >  }
583 >
584 >  //write out forces and current positions of z-constraint molecules
585 >  if (info->getTime() >= curZconsTime){
586 >    for (int i = 0; i < (int) (zconsMols.size()); i++){
587 >      zconsMols[i]->getCOM(COM);
588 >      curZPos[i] = COM[whichDirection];
589 >
590 >      //if the z-constraint molecule is still moving, just record its force
591 >      if (states[i] == zcsMoving){
592 >        fz[i] = 0;
593 >        Atom** movingZAtoms;
594 >        movingZAtoms = zconsMols[i]->getMyAtoms();
595 >        for (int j = 0; j < zconsMols[i]->getNAtoms(); j++){
596 >          movingZAtoms[j]->getFrc(force);
597 >          fz[i] += force[whichDirection];
598 >        }
599 >      }
600 >    }
601 >    fzOut->writeFZ(info->getTime(), zconsMols.size(), &indexOfZConsMols[0], &fz[0],
602 >                   &curZPos[0], &zPos[0]);
603 >    curZconsTime += zconsTime;
604 >  }
605 >
606 >  zSysCOMVel = calcSysCOMVel();  
607 > #ifdef IS_MPI
608 >  if (worldRank == 0){
609 > #endif
610 >    //cout << "after calcForce, the COMVel of system is " << zSysCOMVel <<endl;
611 > #ifdef IS_MPI
612 >  }
613 > #endif
614 > }
615 >
616 >
617 > /**
618 > *
619 > */
620 >
621 > template<typename T> double ZConstraint<T>::calcZSys(){
622 >  //calculate reference z coordinate for z-constraint molecules
623 >  double totalMass_local;
624 >  double totalMass;
625 >  double totalMZ_local;
626 >  double totalMZ;
627 >  double massOfCurMol;
628 >  double COM[3];
629 >
630 >  totalMass_local = 0;
631 >  totalMZ_local = 0;
632 >
633 >  for (int i = 0; i < nMols; i++){
634 >    massOfCurMol = molecules[i].getTotalMass();
635 >    molecules[i].getCOM(COM);
636 >
637 >    totalMass_local += massOfCurMol;
638 >    totalMZ_local += massOfCurMol * COM[whichDirection];
639 >  }
640 >
641 >
642 > #ifdef IS_MPI  
643 >  MPI_Allreduce(&totalMass_local, &totalMass, 1, MPI_DOUBLE, MPI_SUM,
644 >                MPI_COMM_WORLD);
645 >  MPI_Allreduce(&totalMZ_local, &totalMZ, 1, MPI_DOUBLE, MPI_SUM, MPI_COMM_WORLD);  
646 > #else
647 >  totalMass = totalMass_local;
648 >  totalMZ = totalMZ_local;
649 > #endif  
650 >
651 >  double zsys;
652 >  zsys = totalMZ / totalMass;
653 >
654 >  return zsys;
655 > }
656 >
657 > /**
658 > *
659 > */
660 > template<typename T> void ZConstraint<T>::thermalize(void){
661 >  T::thermalize();
662 >  zeroOutVel();
663 > }
664 >
665 > /**
666 > *
667 > */
668 >
669 > template<typename T> void ZConstraint<T>::zeroOutVel(){
670 >  Atom** fixedZAtoms;  
671 >  double COMvel[3];
672 >  double vel[3];
673 >  double zSysCOMVel;
674 >
675 >  //zero out the velocities of center of mass of fixed z-constrained molecules
676 >
677 >  for (int i = 0; i < (int) (zconsMols.size()); i++){
678 >    if (states[i] == zcsFixed){
679 >      zconsMols[i]->getCOMvel(COMvel);      
680 >      //cout << "before resetting " << indexOfZConsMols[i] <<"'s vz is " << COMvel[whichDirection] << endl;
681 >
682 >      fixedZAtoms = zconsMols[i]->getMyAtoms();
683 >
684 >      for (int j = 0; j < zconsMols[i]->getNAtoms(); j++){
685 >        fixedZAtoms[j]->getVel(vel);
686 >        vel[whichDirection] -= COMvel[whichDirection];
687 >        fixedZAtoms[j]->setVel(vel);
688 >      }
689 >
690 >      zconsMols[i]->getCOMvel(COMvel);
691 >      //cout << "after resetting " << indexOfZConsMols[i] <<"'s vz is " << COMvel[whichDirection] << endl;
692 >    }
693 >  }
694 >
695 >  //cout << "before resetting the COMVel of moving molecules is " << calcMovingMolsCOMVel() <<endl;
696 >
697 >  zSysCOMVel = calcSysCOMVel();
698 > #ifdef IS_MPI
699 >  if (worldRank == 0){
700 > #endif
701 >    //cout << "before resetting the COMVel of sytem is " << zSysCOMVel << endl;  
702 > #ifdef IS_MPI
703 >  }
704 > #endif
705 >
706 >  // calculate the vz of center of mass of unconstrained molecules and moving z-constrained molecules
707 >  double MVzOfMovingMols_local;
708 >  double MVzOfMovingMols;
709 >  double totalMassOfMovingZMols_local;
710 >  double totalMassOfMovingZMols;
711 >
712 >  MVzOfMovingMols_local = 0;
713 >  totalMassOfMovingZMols_local = 0;
714 >
715 >  for (int i = 0; i < (int) (unconsMols.size()); i++){
716 >    unconsMols[i]->getCOMvel(COMvel);
717 >    MVzOfMovingMols_local += massOfUnconsMols[i] * COMvel[whichDirection];
718 >  }
719 >
720 >  for (int i = 0; i < (int) (zconsMols.size()); i++){
721 >    if (states[i] == zcsMoving){
722 >      zconsMols[i]->getCOMvel(COMvel);
723 >      MVzOfMovingMols_local += massOfZConsMols[i] * COMvel[whichDirection];  
724 >      totalMassOfMovingZMols_local += massOfZConsMols[i];
725 >    }
726 >  }
727 >
728 > #ifndef IS_MPI
729 >  MVzOfMovingMols = MVzOfMovingMols_local;
730 >  totalMassOfMovingZMols = totalMassOfMovingZMols_local;
731 > #else
732 >  MPI_Allreduce(&MVzOfMovingMols_local, &MVzOfMovingMols, 1, MPI_DOUBLE,
733 >                MPI_SUM, MPI_COMM_WORLD);
734 >  MPI_Allreduce(&totalMassOfMovingZMols_local, &totalMassOfMovingZMols, 1,
735 >                MPI_DOUBLE, MPI_SUM, MPI_COMM_WORLD);  
736 > #endif
737 >
738 >  double vzOfMovingMols;
739 >  vzOfMovingMols = MVzOfMovingMols /
740 >                   (totalMassOfUncons + totalMassOfMovingZMols);
741 >
742 >  //modify the velocites of unconstrained molecules  
743 >  Atom** unconsAtoms;
744 >  for (int i = 0; i < (int) (unconsMols.size()); i++){
745 >    unconsAtoms = unconsMols[i]->getMyAtoms();
746 >    for (int j = 0; j < unconsMols[i]->getNAtoms(); j++){
747 >      unconsAtoms[j]->getVel(vel);
748 >      vel[whichDirection] -= vzOfMovingMols;
749 >      unconsAtoms[j]->setVel(vel);
750 >    }
751 >  }  
752 >
753 >  //modify the velocities of moving z-constrained molecuels
754 >  Atom** movingZAtoms;
755 >  for (int i = 0; i < (int) (zconsMols.size()); i++){
756 >    if (states[i] == zcsMoving){
757 >      movingZAtoms = zconsMols[i]->getMyAtoms();
758 >      for (int j = 0; j < zconsMols[i]->getNAtoms(); j++){
759 >        movingZAtoms[j]->getVel(vel);
760 >        vel[whichDirection] -= vzOfMovingMols;
761 >        movingZAtoms[j]->setVel(vel);
762 >      }
763 >    }
764 >  }
765 >
766 >
767 >  zSysCOMVel = calcSysCOMVel();
768 > #ifdef IS_MPI
769 >  if (worldRank == 0){
770 > #endif
771 >    //cout << "after resetting the COMVel of moving molecules is " << zSysCOMVel << endl;  
772 > #ifdef IS_MPI
773 >  }
774 > #endif
775 > }
776 >
777 > /**
778 > *
779 > */
780 >
781 > template<typename T> void ZConstraint<T>::doZconstraintForce(){
782 >  Atom** zconsAtoms;
783 >  double totalFZ;
784 >  double totalFZ_local;
785 >  double COM[3];
786 >  double force[3];
787 >
788 >  //constrain the molecules which do not reach the specified positions  
789 >
790 >  //Zero Out the force of z-contrained molecules    
791 >  totalFZ_local = 0;
792 >
793 >  //calculate the total z-contrained force of fixed z-contrained molecules
794 >
795 >  //cout << "before zero out z-constraint force on fixed z-constraint molecuels "
796 >  //       << "total force is " << calcTotalForce() << endl;
797 >
798 >  for (int i = 0; i < (int) (zconsMols.size()); i++){
799 >    if (states[i] == zcsFixed){
800 >      zconsMols[i]->getCOM(COM);
801 >      zconsAtoms = zconsMols[i]->getMyAtoms();  
802 >
803 >      fz[i] = 0;      
804 >      for (int j = 0; j < zconsMols[i]->getNAtoms(); j++){
805 >        zconsAtoms[j]->getFrc(force);
806 >        fz[i] += force[whichDirection];
807 >      }
808 >      totalFZ_local += fz[i];
809 >
810 >      //cout << "Fixed Molecule\tindex: " << indexOfZConsMols[i]
811 >      //      <<"\tcurrent zpos: " << COM[whichDirection]
812 >      //      << "\tcurrent fz: " <<fz[i] << endl;
813 >    }
814 >  }
815 >
816 >  //calculate total z-constraint force
817 > #ifdef IS_MPI
818 >  MPI_Allreduce(&totalFZ_local, &totalFZ, 1, MPI_DOUBLE, MPI_SUM, MPI_COMM_WORLD);
819 > #else
820 >  totalFZ = totalFZ_local;
821 > #endif
822 >
823 >
824 >  // apply negative to fixed z-constrained molecues;
825 >  force[0] = 0;
826 >  force[1] = 0;
827 >  force[2] = 0;
828 >
829 >  for (int i = 0; i < (int) (zconsMols.size()); i++){
830 >    if (states[i] == zcsFixed){
831 >      int nAtomOfCurZConsMol = zconsMols[i]->getNAtoms();
832 >      zconsAtoms = zconsMols[i]->getMyAtoms();  
833 >
834 >      for (int j = 0; j < nAtomOfCurZConsMol; j++){
835 >        //force[whichDirection] = -fz[i]/ nAtomOfCurZConsMol;
836 >        force[whichDirection] = -forcePolicy->getZFOfFixedZMols(zconsMols[i],
837 >                                                                zconsAtoms[j],
838 >                                                                fz[i]);
839 >        zconsAtoms[j]->addFrc(force);
840 >      }
841 >    }
842 >  }
843 >
844 >  //cout << "after zero out z-constraint force on fixed z-constraint molecuels "
845 >  //      << "total force is " << calcTotalForce() << endl;
846 >
847 >
848 >  force[0] = 0;
849 >  force[1] = 0;
850 >  force[2] = 0;
851 >
852 >  //modify the forces of unconstrained molecules
853 >  for (int i = 0; i < (int) (unconsMols.size()); i++){
854 >    Atom** unconsAtoms = unconsMols[i]->getMyAtoms();
855 >
856 >    for (int j = 0; j < unconsMols[i]->getNAtoms(); j++){
857 >      //force[whichDirection] = totalFZ / (totNumOfUnconsAtoms + nMovingZAtoms);
858 >      force[whichDirection] = forcePolicy->getZFOfMovingMols(unconsAtoms[j],
859 >                                                             totalFZ);
860 >      unconsAtoms[j]->addFrc(force);
861 >    }
862 >  }      
863 >
864 >  //modify the forces of moving z-constrained molecules
865 >  for (int i = 0; i < (int) (zconsMols.size()); i++){
866 >    if (states[i] == zcsMoving){
867 >      Atom** movingZAtoms = zconsMols[i]->getMyAtoms();    
868 >
869 >      for (int j = 0; j < zconsMols[i]->getNAtoms(); j++){
870 >        //force[whichDirection] = totalFZ / (totNumOfUnconsAtoms + nMovingZAtoms);
871 >        force[whichDirection] = forcePolicy->getZFOfMovingMols(movingZAtoms[j],
872 >                                                               totalFZ);
873 >        movingZAtoms[j]->addFrc(force);
874 >      }
875 >    }
876 >  }
877 >  //  cout << "after substracting z-constraint force from moving molecuels "
878 >  //        << "total force is " << calcTotalForce()  << endl;
879 > }
880 >
881 > /**
882 >  *
883 >  *
884 >  */
885 >
886 > template<typename T> void ZConstraint<T>::doHarmonic(vector<double>& resPos){
887 >  double force[3];
888 >  double harmonicU;
889 >  double harmonicF;
890 >  double COM[3];
891 >  double diff;
892 >  double totalFZ_local;
893 >  double totalFZ;
894 >
895 >  force[0] = 0;
896 >  force[1] = 0;
897 >  force[2] = 0;
898 >
899 >  totalFZ_local = 0;
900 >
901 >  for (int i = 0; i < (int) (zconsMols.size()); i++){
902 >    if (states[i] == zcsMoving){
903 >      zconsMols[i]->getCOM(COM);
904 >      //       cout << "Moving Molecule\tindex: " << indexOfZConsMols[i]
905 >      //     << "\tcurrent zpos: " << COM[whichDirection] << endl;
906 >
907 >      diff = COM[whichDirection] - resPos[i];
908 >
909 >      harmonicU = 0.5 * kz[i] * diff * diff;  
910 >      info->lrPot += harmonicU;
911 >
912 >      harmonicF = -kz[i] * diff;
913 >      totalFZ_local += harmonicF;
914 >
915 >      //adjust force
916 >
917 >      Atom** movingZAtoms = zconsMols[i]->getMyAtoms();    
918 >
919 >      for (int j = 0; j < zconsMols[i]->getNAtoms(); j++){
920 >        //force[whichDirection] = harmonicF / zconsMols[i]->getNAtoms();
921 >        force[whichDirection] = forcePolicy->getHFOfFixedZMols(zconsMols[i],
922 >                                                               movingZAtoms[j],
923 >                                                               harmonicF);
924 >        movingZAtoms[j]->addFrc(force);
925 >      }
926 >    }
927 >  }
928 >
929 > #ifndef IS_MPI
930 >  totalFZ = totalFZ_local;
931 > #else
932 >  MPI_Allreduce(&totalFZ_local, &totalFZ, 1, MPI_DOUBLE, MPI_SUM, MPI_COMM_WORLD);  
933 > #endif
934 >
935 >  //cout << "before substracting harmonic force from moving molecuels "
936 >  //      << "total force is " << calcTotalForce()  << endl;
937 >
938 >  force[0] = 0;
939 >  force[1] = 0;
940 >  force[2] = 0;
941 >
942 >  //modify the forces of unconstrained molecules
943 >  for (int i = 0; i < (int) (unconsMols.size()); i++){
944 >    Atom** unconsAtoms = unconsMols[i]->getMyAtoms();
945 >
946 >    for (int j = 0; j < unconsMols[i]->getNAtoms(); j++){
947 >      //force[whichDirection] = - totalFZ /totNumOfUnconsAtoms;
948 >      force[whichDirection] = -forcePolicy->getHFOfUnconsMols(unconsAtoms[j],
949 >                                                              totalFZ);
950 >      unconsAtoms[j]->addFrc(force);
951 >    }
952 >  }  
953 >
954 >  //cout << "after substracting harmonic force from moving molecuels "
955 >  //      << "total force is " << calcTotalForce()  << endl;
956 > }
957 >
958 > /**
959 > *
960 > */
961 >
962 > template<typename T> bool ZConstraint<T>::checkZConsState(){
963 >  double COM[3];
964 >  double diff;
965 >
966 >  int changed_local;
967 >  int changed;
968 >
969 >  changed_local = 0;
970 >
971 >  for (int i = 0; i < (int) (zconsMols.size()); i++){
972 >    zconsMols[i]->getCOM(COM);
973 >    diff = fabs(COM[whichDirection] - zPos[i]);  
974 >    if (diff <= zconsTol && states[i] == zcsMoving){
975 >      states[i] = zcsFixed;
976 >      changed_local = 1;
977 >
978 >      if (hasZConsGap)
979 >        endFixTime[i] = info->getTime() + zconsFixTime;
980 >    }
981 >    else if (diff > zconsTol && states[i] == zcsFixed){
982 >      states[i] = zcsMoving;
983 >      changed_local = 1;  
984 >
985 >      if (hasZConsGap)
986 >        endFixTime[i] = INFINITE_TIME;
987 >    }
988 >  }
989 >
990 > #ifndef IS_MPI
991 >  changed = changed_local;
992 > #else
993 >  MPI_Allreduce(&changed_local, &changed, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD);
994 > #endif
995 >
996 >  return (changed > 0);
997 > }
998 >
999 > template<typename T> bool ZConstraint<T>::haveFixedZMols(){
1000 >  int havingFixed_local;
1001 >  int havingFixed;
1002 >
1003 >  havingFixed_local = 0;
1004 >
1005 >  for (int i = 0; i < (int) (zconsMols.size()); i++)
1006 >    if (states[i] == zcsFixed){
1007 >      havingFixed_local = 1;
1008 >      break;
1009 >    }
1010 >
1011 > #ifndef IS_MPI
1012 >  havingFixed = havingFixed_local;
1013 > #else
1014 >  MPI_Allreduce(&havingFixed_local, &havingFixed, 1, MPI_INT, MPI_SUM,
1015 >                MPI_COMM_WORLD);
1016 > #endif
1017 >
1018 >  return (havingFixed > 0);
1019 > }
1020 >
1021 >
1022 > /**
1023 > *
1024 > */
1025 > template<typename T> bool ZConstraint<T>::haveMovingZMols(){
1026 >  int havingMoving_local;
1027 >  int havingMoving;
1028 >
1029 >  havingMoving_local = 0;
1030 >
1031 >  for (int i = 0; i < (int) (zconsMols.size()); i++)
1032 >    if (states[i] == zcsMoving){
1033 >      havingMoving_local = 1;
1034 >      break;
1035 >    }
1036 >
1037 > #ifndef IS_MPI
1038 >  havingMoving = havingMoving_local;
1039 > #else
1040 >  MPI_Allreduce(&havingMoving_local, &havingMoving, 1, MPI_INT, MPI_SUM,
1041 >                MPI_COMM_WORLD);
1042 > #endif
1043 >
1044 >  return (havingMoving > 0);
1045 > }
1046 >
1047 > /**
1048 > *
1049 > */
1050 >
1051 > template<typename T> double ZConstraint<T>::calcMovingMolsCOMVel(){
1052 >  double MVzOfMovingMols_local;
1053 >  double MVzOfMovingMols;
1054 >  double totalMassOfMovingZMols_local;
1055 >  double totalMassOfMovingZMols;
1056 >  double COMvel[3];
1057 >
1058 >  MVzOfMovingMols_local = 0;
1059 >  totalMassOfMovingZMols_local = 0;
1060 >
1061 >  for (int i = 0; i < unconsMols.size(); i++){
1062 >    unconsMols[i]->getCOMvel(COMvel);
1063 >    MVzOfMovingMols_local += massOfUnconsMols[i] * COMvel[whichDirection];
1064 >  }
1065 >
1066 >  for (int i = 0; i < zconsMols.size(); i++){
1067 >    if (states[i] == zcsMoving){
1068 >      zconsMols[i]->getCOMvel(COMvel);
1069 >      MVzOfMovingMols_local += massOfZConsMols[i] * COMvel[whichDirection];  
1070 >      totalMassOfMovingZMols_local += massOfZConsMols[i];
1071 >    }
1072 >  }
1073 >
1074 > #ifndef IS_MPI
1075 >  MVzOfMovingMols = MVzOfMovingMols_local;
1076 >  totalMassOfMovingZMols = totalMassOfMovingZMols_local;
1077 > #else
1078 >  MPI_Allreduce(&MVzOfMovingMols_local, &MVzOfMovingMols, 1, MPI_DOUBLE,
1079 >                MPI_SUM, MPI_COMM_WORLD);
1080 >  MPI_Allreduce(&totalMassOfMovingZMols_local, &totalMassOfMovingZMols, 1,
1081 >                MPI_DOUBLE, MPI_SUM, MPI_COMM_WORLD);  
1082 > #endif
1083 >
1084 >  double vzOfMovingMols;
1085 >  vzOfMovingMols = MVzOfMovingMols /
1086 >                   (totalMassOfUncons + totalMassOfMovingZMols);
1087 >
1088 >  return vzOfMovingMols;
1089 > }
1090 >
1091 > /**
1092 > *
1093 > */
1094 >
1095 > template<typename T> double ZConstraint<T>::calcSysCOMVel(){
1096 >  double COMvel[3];
1097 >  double tempMVz_local;
1098 >  double tempMVz;
1099 >  double massOfZCons_local;
1100 >  double massOfZCons;
1101 >
1102 >
1103 >  tempMVz_local = 0;
1104 >
1105 >  for (int i = 0 ; i < nMols; i++){
1106 >    molecules[i].getCOMvel(COMvel);
1107 >    tempMVz_local += molecules[i].getTotalMass() * COMvel[whichDirection];
1108 >  }
1109 >
1110 >  massOfZCons_local = 0;
1111 >
1112 >  for (int i = 0; i < (int) (massOfZConsMols.size()); i++){
1113 >    massOfZCons_local += massOfZConsMols[i];
1114 >  }
1115 > #ifndef IS_MPI
1116 >  massOfZCons = massOfZCons_local;
1117 >  tempMVz = tempMVz_local;
1118 > #else
1119 >  MPI_Allreduce(&massOfZCons_local, &massOfZCons, 1, MPI_DOUBLE, MPI_SUM,
1120 >                MPI_COMM_WORLD);
1121 >  MPI_Allreduce(&tempMVz_local, &tempMVz, 1, MPI_DOUBLE, MPI_SUM, MPI_COMM_WORLD);
1122 > #endif
1123 >
1124 >  return tempMVz / (totalMassOfUncons + massOfZCons);
1125 > }
1126 >
1127 > /**
1128 > *
1129 > */
1130 >
1131 > template<typename T> double ZConstraint<T>::calcTotalForce(){
1132 >  double force[3];  
1133 >  double totalForce_local;
1134 >  double totalForce;
1135 >
1136 >  totalForce_local = 0;
1137 >
1138 >  for (int i = 0; i < nAtoms; i++){
1139 >    atoms[i]->getFrc(force);
1140 >    totalForce_local += force[whichDirection];
1141 >  }
1142 >
1143 > #ifndef IS_MPI
1144 >  totalForce = totalForce_local;
1145 > #else
1146 >  MPI_Allreduce(&totalForce_local, &totalForce, 1, MPI_DOUBLE, MPI_SUM,
1147 >                MPI_COMM_WORLD);
1148 > #endif
1149 >
1150 >  return totalForce;
1151 > }
1152 >
1153 > /**
1154 > *
1155 > */
1156 >
1157 > template<typename T> void ZConstraint<T>::PolicyByNumber::update(){
1158 >  //calculate the number of atoms of moving z-constrained molecules
1159 >  int nMovingZAtoms_local;
1160 >  int nMovingZAtoms;
1161 >
1162 >  nMovingZAtoms_local = 0;
1163 >  for (int i = 0; i < (int) ((zconsIntegrator->zconsMols).size()); i++)
1164 >    if ((zconsIntegrator->states)[i] == (zconsIntegrator->zcsMoving)){
1165 >      nMovingZAtoms_local += (zconsIntegrator->zconsMols)[i]->getNAtoms();
1166 >    }
1167 >
1168 > #ifdef IS_MPI
1169 >  MPI_Allreduce(&nMovingZAtoms_local, &nMovingZAtoms, 1, MPI_INT, MPI_SUM,
1170 >                MPI_COMM_WORLD);
1171 > #else
1172 >  nMovingZAtoms = nMovingZAtoms_local;
1173 > #endif
1174 >  totNumOfMovingAtoms = nMovingZAtoms + zconsIntegrator->totNumOfUnconsAtoms;
1175 > }
1176 >
1177 > template<typename T> double ZConstraint<T>::PolicyByNumber::getZFOfFixedZMols(Molecule* mol,
1178 >                                                                              Atom* atom,
1179 >                                                                              double totalForce){
1180 >  return totalForce / mol->getNAtoms();
1181 > }
1182 >
1183 > template<typename T> double ZConstraint<T>::PolicyByNumber::getZFOfMovingMols(Atom* atom,
1184 >                                                                              double totalForce){
1185 >  return totalForce / totNumOfMovingAtoms;
1186 > }
1187 >
1188 > template<typename T> double ZConstraint<T>::PolicyByNumber::getHFOfFixedZMols(Molecule* mol,
1189 >                                                                              Atom* atom,
1190 >                                                                              double totalForce){
1191 >  return totalForce / mol->getNAtoms();
1192 > }
1193 >
1194 > template<typename T> double ZConstraint<T>::PolicyByNumber::getHFOfUnconsMols(Atom* atom,
1195 >                                                                              double totalForce){
1196 >  return totalForce / zconsIntegrator->totNumOfUnconsAtoms;
1197 > }
1198 >
1199 > /**
1200 > *
1201 > */
1202 >
1203 > template<typename T> void ZConstraint<T>::PolicyByMass::update(){
1204 >  //calculate the number of atoms of moving z-constrained molecules
1205 >  double massOfMovingZAtoms_local;
1206 >  double massOfMovingZAtoms;
1207 >
1208 >  massOfMovingZAtoms_local = 0;
1209 >  for (int i = 0; i < (int) ((zconsIntegrator->zconsMols).size()); i++)
1210 >    if ((zconsIntegrator->states)[i] == (zconsIntegrator->zcsMoving)){
1211 >      massOfMovingZAtoms_local += (zconsIntegrator->zconsMols)[i]->getTotalMass();
1212 >    }
1213 >
1214 > #ifdef IS_MPI
1215 >  MPI_Allreduce(&massOfMovingZAtoms_local, &massOfMovingZAtoms, 1, MPI_DOUBLE,
1216 >                MPI_SUM, MPI_COMM_WORLD);
1217 > #else
1218 >  massOfMovingZAtoms = massOfMovingZAtoms_local;
1219 > #endif
1220 >  totMassOfMovingAtoms = massOfMovingZAtoms +
1221 >                         zconsIntegrator->totalMassOfUncons;
1222 > }
1223 >
1224 > template<typename T> double ZConstraint<T>::PolicyByMass::getZFOfFixedZMols(Molecule* mol,
1225 >                                                                            Atom* atom,
1226 >                                                                            double totalForce){
1227 >  return totalForce * atom->getMass() / mol->getTotalMass();
1228 > }
1229 >
1230 > template<typename T> double ZConstraint<T>::PolicyByMass::getZFOfMovingMols(Atom* atom,
1231 >                                                                            double totalForce){
1232 >  return totalForce * atom->getMass() / totMassOfMovingAtoms;
1233 > }
1234 >
1235 > template<typename T> double ZConstraint<T>::PolicyByMass::getHFOfFixedZMols(Molecule* mol,
1236 >                                                                            Atom* atom,
1237 >                                                                            double totalForce){
1238 >  return totalForce * atom->getMass() / mol->getTotalMass();
1239 > }
1240 >
1241 > template<typename T> double ZConstraint<T>::PolicyByMass::getHFOfUnconsMols(Atom* atom,
1242 >                                                                            double totalForce){
1243 >  return totalForce * atom->getMass() / zconsIntegrator->totalMassOfUncons;
1244 > }
1245 >
1246 > template<typename T> void ZConstraint<T>::updateZPos(){
1247 >  double curTime;
1248 >  double COM[3];
1249 >  
1250 >  curTime = info->getTime();
1251 >
1252 >  for (size_t i = 0; i < zconsMols.size(); i++){
1253 >
1254 >    if (states[i] == zcsFixed && curTime >= endFixTime[i]){
1255 >      zPos[i] += zconsGap;
1256 >
1257 >      if (usingSMD){
1258 >        zconsMols[i]->getCOM(COM);
1259 >        cantPos[i] = COM[whichDirection];
1260 >      }
1261 >      
1262 >    }
1263 >    
1264 >  }
1265 >  
1266 > }
1267 >
1268 > template<typename T> void ZConstraint<T>::updateCantPos(){
1269 >  double curTime;
1270 >  double dt;
1271 >
1272 >  curTime = info->getTime();
1273 >  dt = info->dt;
1274 >
1275 >  for (size_t i = 0; i < zconsMols.size(); i++){
1276 >    if (states[i] == zcsMoving){
1277 >      cantPos[i] += cantVel[i] * dt;
1278 >    }
1279 >  }
1280 >
1281 > }

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