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root/group/trunk/OOPSE/libmdtools/ZConstraint.cpp
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Comparing trunk/OOPSE/libmdtools/ZConstraint.cpp (file contents):
Revision 671 by mmeineke, Fri Aug 8 17:48:44 2003 UTC vs.
Revision 1091 by tim, Tue Mar 16 19:22:56 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 <          
37 <      indexOfAllZConsMols = index->getIndexData();
38 <      
39 <      //the maximum value of index is the last one(we sorted the index data in SimSetup.cpp)
40 <      int maxIndex;
41 <      int totalNumMol;
42 <      
43 <      maxIndex = indexOfAllZConsMols[indexOfAllZConsMols.size() - 1];
44 <
45 < #ifndef IS_MPI
46 <      totalNumMol = nMols;
47 < #else
48 <      totalNumMol = mpiSim->getTotNmol();  
49 < #endif      
50 <      
51 <      if(maxIndex > totalNumMol - 1){
52 <        sprintf( painCave.errMsg,
53 <               "ZConstraint error: index is out of range\n");
54 <        painCave.isFatal = 1;
55 <        simError();
56 <                
57 <      }
58 <      
59 <    }
60 <        
61 <  }
62 <  
63 <  //retrive sample time of z-contraint
64 <  data = info->getProperty("zconstime");
65 <  
66 <  if(!data) {
67 <      
68 <    sprintf( painCave.errMsg,
69 <               "ZConstraint error: If you use an ZConstraint\n"
70 <               " , you must set sample time.\n");
71 <    painCave.isFatal = 1;
72 <    simError();      
73 <  }
74 <  else{
75 <  
76 <    sampleTime = dynamic_cast<DoubleData*>(data);
77 <    
78 <    if(!sampleTime){
79 <
80 <      sprintf( painCave.errMsg,
81 <                 "ZConstraint error: Can not get property from SimInfo\n");
82 <      painCave.isFatal = 1;
83 <      simError();  
84 <      
85 <    }
86 <    else{
87 <      this->zconsTime = sampleTime->getData();
88 <    }
89 <
90 <  }
91 <  
92 <  
93 <  //retrive output filename of z force
94 <  data = info->getProperty("zconsfilename");
95 <  if(!data) {
96 <
97 <      
98 <    sprintf( painCave.errMsg,
99 <               "ZConstraint error: If you use an ZConstraint\n"
100 <               " , you must set output filename of z-force.\n");
101 <    painCave.isFatal = 1;
102 <    simError();  
103 <
104 <  }
105 <  else{
106 <
107 <     filename = dynamic_cast<StringData*>(data);
108 <    
109 <    if(!filename){
110 <
111 <      sprintf( painCave.errMsg,
112 <                 "ZConstraint error: Can not get property from SimInfo\n");
113 <      painCave.isFatal = 1;
114 <      simError();  
115 <        
116 <    }
117 <    else{
118 <      this->zconsOutput = filename->getData();
119 <    }
120 <    
121 <
122 <  }
123 <
124 <
125 <  //calculate reference z coordinate for z-constraint molecules
126 <  double totalMass_local;
127 <  double totalMass;
128 <  double totalMZ_local;
129 <  double totalMZ;
130 <  double massOfUncons_local;
131 <  double massOfCurMol;
132 <  double COM[3];
133 <  
134 <  totalMass_local = 0;
135 <  totalMass = 0;
136 <  totalMZ_local = 0;
137 <  totalMZ = 0;
138 <  massOfUncons_local = 0;
139 <    
140 <  
141 <  for(int i = 0; i < nMols; i++){
142 <    massOfCurMol = molecules[i].getTotalMass();
143 <    molecules[i].getCOM(COM);
144 <    
145 <    totalMass_local += massOfCurMol;
146 <    totalMZ_local += massOfCurMol * COM[2];
147 <    
148 <    if(isZConstraintMol(&molecules[i]) == -1){
149 <    
150 <      massOfUncons_local += massOfCurMol;
151 <    }  
152 <    
153 <  }
154 <  
155 <  
156 < #ifdef IS_MPI  
157 <  MPI_Allreduce(&totalMass_local, &totalMass, 1, MPI_DOUBLE,MPI_SUM, MPI_COMM_WORLD);
158 <  MPI_Allreduce(&totalMZ_local, &totalMZ, 1, MPI_DOUBLE,MPI_SUM, MPI_COMM_WORLD);  
159 <  MPI_Allreduce(&massOfUncons_local, &totalMassOfUncons, 1, MPI_DOUBLE,MPI_SUM, MPI_COMM_WORLD);
160 < #else
161 <  totalMass = totalMass_local;
162 <  totalMZ = totalMZ_local;
163 <  totalMassOfUncons = massOfUncons_local;
164 < #endif  
165 <
166 <  double zsys;
167 <  zsys = totalMZ / totalMass;
168 <
169 < #ifndef IS_MPI  
170 <  for(int i = 0; i < nMols; i++){
171 <    
172 <    if(isZConstraintMol(&molecules[i]) > -1 ){
173 <      molecules[i].getCOM(COM);
174 <      allRefZ.push_back(COM[2] - zsys);  
175 <    }
176 <    
177 <  }
178 < #else
179 <
180 <  int whichNode;
181 <  enum CommType { RequestMolZPos, EndOfRequest} status;
182 <  //int status;
183 <  double zpos;
184 <  int localIndex;
185 <  MPI_Status ierr;
186 <  int tag = 0;
187 <  
188 <  if(worldRank == 0){
189 <    
190 <    int globalIndexOfCurMol;
191 <    int *MolToProcMap;
192 <    MolToProcMap = mpiSim->getMolToProcMap();
193 <    
194 <    for(int i = 0; i < indexOfAllZConsMols.size(); i++){
195 <      
196 <      whichNode = MolToProcMap[indexOfAllZConsMols[i]];
197 <      globalIndexOfCurMol = indexOfAllZConsMols[i];
198 <      
199 <      if(whichNode == 0){
200 <        
201 <        for(int j = 0; j < nMols; j++)
202 <          if(molecules[j].getGlobalIndex() == globalIndexOfCurMol){
203 <            localIndex = j;
204 <            break;
205 <          }
206 <                  
207 <        molecules[localIndex].getCOM(COM);
208 <        allRefZ.push_back(COM[2] - zsys);  
209 <              
210 <      }
211 <      else{
212 <        status = RequestMolZPos;
213 <        MPI_Send(&status, 1, MPI_INT, whichNode, tag, MPI_COMM_WORLD);
214 <        MPI_Send(&globalIndexOfCurMol, 1, MPI_INT, whichNode, tag, MPI_COMM_WORLD);
215 <        MPI_Recv(&zpos, 1, MPI_DOUBLE_PRECISION, whichNode, tag, MPI_COMM_WORLD, &ierr);
216 <        
217 <        allRefZ.push_back(zpos - zsys);
218 <      
219 <      }
220 <              
221 <    } //End of Request Loop
222 <    
223 <    //Send ending request message to slave nodes    
224 <    status = EndOfRequest;
225 <    for(int i =1; i < mpiSim->getNumberProcessors(); i++)
226 <      MPI_Send(&status, 1, MPI_INT, i, tag, MPI_COMM_WORLD);
227 <    
228 <  }
229 <  else{
230 <  
231 <    int whichMol;
232 <    bool done = false;
233 <
234 <    while (!done){  
235 <      
236 <      MPI_Recv(&status, 1, MPI_INT, 0, tag, MPI_COMM_WORLD, &ierr);
237 <    
238 <      switch (status){
239 <          
240 <        case RequestMolZPos :
241 <          
242 <          MPI_Recv(&whichMol, 1, MPI_INT, 0, tag, MPI_COMM_WORLD,&ierr);
243 <          
244 <          for(int i = 0; i < nMols; i++)
245 <            if(molecules[i].getGlobalIndex() == whichMol){
246 <              localIndex = i;
247 <              break;
248 <            }
249 <          
250 <          molecules[localIndex].getCOM(COM);
251 <          zpos = COM[2];          
252 <          MPI_Send(&zpos, 1, MPI_DOUBLE_PRECISION, 0, tag, MPI_COMM_WORLD);      
253 <          
254 <          break;
255 <            
256 <        case EndOfRequest :
257 <        
258 <         done = true;
259 <         break;
260 <      }
261 <      
262 <    }
263 <          
264 <  }
265 <
266 <  //Brocast the allRefZ to slave nodes;
267 <  double* allRefZBuf;
268 <  int nZConsMols;
269 <  nZConsMols = indexOfAllZConsMols.size();
270 <  
271 <  allRefZBuf = new double[nZConsMols];
272 <  
273 <  if(worldRank == 0){
274 <
275 <    for(int i = 0; i < nZConsMols; i++)
276 <      allRefZBuf[i] = allRefZ[i];
277 <  }    
278 <  
279 <    MPI_Bcast(allRefZBuf, nZConsMols, MPI_DOUBLE_PRECISION, 0, MPI_COMM_WORLD);
280 <  
281 <  if(worldRank != 0){
282 <    
283 <    for(int i = 0; i < nZConsMols; i++)
284 <      allRefZ.push_back(allRefZBuf[i]);  
285 <  }
286 <  
287 <  delete[] allRefZBuf;
288 < #endif
289 <
290 <  
291 < #ifdef IS_MPI
292 <  update();
293 < #else  
294 <  int searchResult;
295 <  
296 <  refZ = allRefZ;
297 <
298 <  for(int i = 0; i < nMols; i++){
299 <    
300 <    searchResult = isZConstraintMol(&molecules[i]);
301 <    
302 <    if(searchResult > -1){
303 <    
304 <      zconsMols.push_back(&molecules[i]);      
305 <      massOfZConsMols.push_back(molecules[i].getTotalMass());  
306 <      
307 <      molecules[i].getCOM(COM);
308 <    }
309 <    else
310 <    {
311 <    
312 <      unconsMols.push_back(&molecules[i]);
313 <      massOfUnconsMols.push_back(molecules[i].getTotalMass());
314 <
315 <    }
316 <  }
317 <
318 <  fz = new double[zconsMols.size()];
319 <  indexOfZConsMols = new int [zconsMols.size()];
320 <
321 <  if(!fz || !indexOfZConsMols){
322 <    sprintf( painCave.errMsg,
323 <             "Memory allocation failure in class Zconstraint\n");
324 <    painCave.isFatal = 1;
325 <    simError();
326 <  }
327 <
328 <  for(int i = 0; i < zconsMols.size(); i++)
329 <    indexOfZConsMols[i] = zconsMols[i]->getGlobalIndex();
330 <  
331 < #endif
332 <  
333 <  fzOut = new ZConsWriter(zconsOutput.c_str());  
334 <  
335 <  if(!fzOut){
336 <    sprintf( painCave.errMsg,
337 <             "Memory allocation failure in class Zconstraint\n");
338 <    painCave.isFatal = 1;
339 <    simError();
340 <  }
341 <  
342 <  fzOut->writeRefZ(indexOfAllZConsMols, allRefZ);
343 < }
344 <
345 < template<typename T> ZConstraint<T>::~ZConstraint()
346 < {
347 <  if(fz)
348 <    delete[] fz;
349 <  
350 <  if(indexOfZConsMols)
351 <    delete[] indexOfZConsMols;
352 <  
353 <  if(fzOut)
354 <    delete fzOut;
355 < }
356 <
357 < #ifdef IS_MPI
358 < template<typename T> void ZConstraint<T>::update()
359 < {
360 <  double COM[3];
361 <  int index;
362 <  
363 <  zconsMols.clear();
364 <  massOfZConsMols.clear();
365 <  refZ.clear();
366 <  
367 <  unconsMols.clear();
368 <  massOfUnconsMols.clear();
369 <
370 <
371 <  //creat zconsMol and unconsMol lists
372 <  for(int i = 0; i < nMols; i++){
373 <    
374 <    index = isZConstraintMol(&molecules[i]);
375 <    
376 <    if(index > -1){
377 <    
378 <      zconsMols.push_back(&molecules[i]);      
379 <      massOfZConsMols.push_back(molecules[i].getTotalMass());  
380 <      
381 <      molecules[i].getCOM(COM);
382 <      refZ.push_back(allRefZ[index]);      
383 <    }
384 <    else
385 <    {
386 <    
387 <      unconsMols.push_back(&molecules[i]);
388 <      massOfUnconsMols.push_back(molecules[i].getTotalMass());
389 <
390 <    }
391 <  }
392 <    
393 <  //The reason to declare fz and indexOfZconsMols as pointer to array is
394 <  // that we want to make the MPI communication simple
395 <  if(fz)
396 <    delete[] fz;
397 <    
398 <  if(indexOfZConsMols)
399 <    delete[] indexOfZConsMols;
400 <    
401 <  if (zconsMols.size() > 0){
402 <    fz = new double[zconsMols.size()];
403 <    indexOfZConsMols =  new int[zconsMols.size()];
404 <    
405 <    if(!fz || !indexOfZConsMols){
406 <      sprintf( painCave.errMsg,
407 <               "Memory allocation failure in class Zconstraint\n");
408 <      painCave.isFatal = 1;
409 <      simError();
410 <    }
411 <        
412 <    for(int i = 0; i < zconsMols.size(); i++){
413 <      indexOfZConsMols[i] = zconsMols[i]->getGlobalIndex();
414 <    }
415 <
416 <  }
417 <  else{
418 <    fz = NULL;
419 <    indexOfZConsMols = NULL;
420 <  }
421 <  
422 < }
423 <
424 < #endif
425 <
426 < /**  Function Name: isZConstraintMol
427 < **  Parameter
428 < **    Molecule* mol
429 < **  Return value:
430 < **    -1, if the molecule is not z-constraint molecule,
431 < **    other non-negative values, its index in indexOfAllZConsMols vector
432 < */
433 <
434 < template<typename T> int ZConstraint<T>::isZConstraintMol(Molecule* mol)
435 < {
436 <  int index;
437 <  int low;
438 <  int high;
439 <  int mid;
440 <
441 <  index = mol->getGlobalIndex();
442 <  
443 <  low = 0;
444 <  high = indexOfAllZConsMols.size() - 1;
445 <  
446 <  //Binary Search (we have sorted the array)  
447 <  while(low <= high){
448 <    mid = (low + high) /2;
449 <    if (indexOfAllZConsMols[mid] == index)
450 <      return mid;
451 <    else if (indexOfAllZConsMols[mid] > index )
452 <       high = mid -1;
453 <    else    
454 <      low = mid + 1;
455 <  }
456 <  
457 <  return -1;
458 < }
459 <
460 < /** Function Name: integrateStep
461 < ** Parameter:
462 < **   int calcPot;
463 < **   int calcStress;
464 < ** Description:
465 < **  Advance One Step.
466 < ** Memo:
467 < **   The best way to implement z-constraint is to override integrateStep
468 < **   Overriding constrainB is not a good choice, since in integrateStep,
469 < **   constrainB is invoked by below line,
470 < **                  if(nConstrained) constrainB();
471 < **   For instance, we would like to apply z-constraint without bond contrain,
472 < **   In that case, if we override constrainB, Z-constrain method will never be executed;
473 < */
474 < template<typename T> void ZConstraint<T>::integrateStep( int calcPot, int calcStress )
475 < {
476 <  T::integrateStep( calcPot, calcStress );
477 <  resetZ();
478 <  
479 <  double currZConsTime = 0;
480 <  
481 <  //write out forces of z constraint
482 <  if( info->getTime() >= currZConsTime){  
483 <      fzOut->writeFZ(info->getTime(), zconsMols.size(),indexOfZConsMols, fz);
484 <  }    
485 < }
486 <
487 < /** Function Name: resetZ
488 < ** Description:
489 < **  Reset the z coordinates
490 < */
491 <
492 < template<typename T> void ZConstraint<T>::resetZ()
493 < {
494 <
495 <  double pos[3];
496 <  double deltaZ;
497 <  double mzOfZCons;   //total sum of m*z of z-constrain molecules
498 <  double mzOfUncons; //total sum of m*z of unconstrain molecuels;
499 <  double totalMZOfZCons;
500 <  double totalMZOfUncons;
501 <  double COM[3];
502 <  double zsys;
503 <  Atom** zconsAtoms;
504 <
505 <  mzOfZCons = 0;
506 <  mzOfUncons  = 0;
507 <  
508 <  for(int i = 0; i < zconsMols.size(); i++){
509 <    mzOfZCons += massOfZConsMols[i] * refZ[i];    
510 <  }
511 <
512 < #ifdef IS_MPI
513 <  MPI_Allreduce(&mzOfZCons, &totalMZOfZCons, 1,MPI_DOUBLE,MPI_SUM, MPI_COMM_WORLD);
514 < #else
515 <  totalMZOfZCons = mzOfZCons;
516 < #endif
517 <
518 <  for(int i = 0; i < unconsMols.size(); i++){
519 <    unconsMols[i]->getCOM(COM);
520 <    mzOfUncons += massOfUnconsMols[i] * COM[2];
521 <  }
522 <  
523 < #ifdef IS_MPI
524 <  MPI_Allreduce(&mzOfUncons, &totalMZOfUncons, 1,MPI_DOUBLE,MPI_SUM, MPI_COMM_WORLD);
525 < #else
526 <  totalMZOfUncons = mzOfUncons;
527 < #endif  
528 <  
529 <  zsys = (totalMZOfZCons + totalMZOfUncons) /totalMassOfUncons;
530 <
531 <  for(int i = 0; i < zconsMols.size(); i++){  
532 <  
533 <    zconsMols[i]->getCOM(COM);
534 <    
535 <    deltaZ = zsys + refZ[i] - COM[2];
536 <    //update z coordinate    
537 <    zconsAtoms = zconsMols[i]->getMyAtoms();    
538 <    for(int j =0; j < zconsMols[i]->getNAtoms(); j++){
539 <      zconsAtoms[j]->getPos(pos);
540 <      pos[2] += deltaZ;
541 <      zconsAtoms[j]->setPos(pos);  
542 <    }    
543 <    
544 <    //calculate z constrain force
545 <    fz[i] = massOfZConsMols[i]* deltaZ / dt2;
546 <    
547 <  }
548 <
549 <      
550 < }
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 >                                                                       indexOfZConsMols(NULL),
9 >                                                                       fz(NULL),
10 >                                                                       curZPos(NULL),
11 >                                                                       fzOut(NULL),
12 >                                                                       curZconsTime(0),
13 >                                                                       forcePolicy(NULL),
14 >                                                                       hasZConsGap(false){
15 >  //get properties from SimInfo
16 >  GenericData* data;
17 >  ZConsParaData* zConsParaData;
18 >  DoubleData* sampleTime;
19 >  DoubleData* tolerance;
20 >  DoubleData* gap;
21 >  DoubleData* fixtime;
22 >  StringData* policy;
23 >  StringData* filename;
24 >  double COM[3];
25 >
26 >  //by default, the direction of constraint is z
27 >  // 0 --> x
28 >  // 1 --> y
29 >  // 2 --> z
30 >  whichDirection = 2;
31 >
32 >  //estimate the force constant of harmonical potential
33 >  double Kb = 1.986E-3 ; //in kcal/K
34 >
35 >  double halfOfLargestBox = max(info->boxL[0], max(info->boxL[1], info->boxL[2])) /
36 >                            2;
37 >  zForceConst = Kb * info->target_temp / (halfOfLargestBox * halfOfLargestBox);
38 >
39 >  //creat force Subtraction policy
40 >  data = info->getProperty(ZCONSFORCEPOLICY_ID);
41 >  if (!data){
42 >    sprintf(painCave.errMsg,
43 >            "ZConstraint Warning: User does not set force Subtraction policy, "
44 >            "PolicyByMass is used\n");
45 >    painCave.isFatal = 0;
46 >    simError();      
47 >
48 >    forcePolicy = (ForceSubtractionPolicy *) new PolicyByMass(this);
49 >  }
50 >  else{
51 >    policy = dynamic_cast<StringData*>(data);
52 >
53 >    if (!policy){
54 >      sprintf(painCave.errMsg,
55 >              "ZConstraint Error: Convertion from GenericData to StringData failure, "
56 >              "PolicyByMass is used\n");
57 >      painCave.isFatal = 0;
58 >      simError();      
59 >
60 >      forcePolicy = (ForceSubtractionPolicy *) new PolicyByMass(this);
61 >    }
62 >    else{
63 >      if (policy->getData() == "BYNUMBER")
64 >        forcePolicy = (ForceSubtractionPolicy *) new PolicyByNumber(this);
65 >      else if (policy->getData() == "BYMASS")
66 >        forcePolicy = (ForceSubtractionPolicy *) new PolicyByMass(this);
67 >      else{
68 >        sprintf(painCave.errMsg,
69 >                "ZConstraint Warning: unknown force Subtraction policy, "
70 >                "PolicyByMass is used\n");
71 >        painCave.isFatal = 0;
72 >        simError();      
73 >        forcePolicy = (ForceSubtractionPolicy *) new PolicyByMass(this);
74 >      }
75 >    }
76 >  }
77 >
78 >
79 >  //retrieve sample time of z-contraint
80 >  data = info->getProperty(ZCONSTIME_ID);
81 >
82 >  if (!data){
83 >    sprintf(painCave.errMsg,
84 >            "ZConstraint error: If you use an ZConstraint\n"
85 >            " , you must set sample time.\n");
86 >    painCave.isFatal = 1;
87 >    simError();
88 >  }
89 >  else{
90 >    sampleTime = dynamic_cast<DoubleData*>(data);
91 >
92 >    if (!sampleTime){
93 >      sprintf(painCave.errMsg,
94 >              "ZConstraint error: Can not get property from SimInfo\n");
95 >      painCave.isFatal = 1;
96 >      simError();
97 >    }
98 >    else{
99 >      this->zconsTime = sampleTime->getData();
100 >    }
101 >  }
102 >
103 >  //retrieve output filename of z force
104 >  data = info->getProperty(ZCONSFILENAME_ID);
105 >  if (!data){
106 >    sprintf(painCave.errMsg,
107 >            "ZConstraint error: If you use an ZConstraint\n"
108 >            " , you must set output filename of z-force.\n");
109 >    painCave.isFatal = 1;
110 >    simError();
111 >  }
112 >  else{
113 >    filename = dynamic_cast<StringData*>(data);
114 >
115 >    if (!filename){
116 >      sprintf(painCave.errMsg,
117 >              "ZConstraint error: Can not get property from SimInfo\n");
118 >      painCave.isFatal = 1;
119 >      simError();
120 >    }
121 >    else{
122 >      this->zconsOutput = filename->getData();
123 >    }
124 >  }
125 >
126 >  //retrieve tolerance for z-constraint molecuels
127 >  data = info->getProperty(ZCONSTOL_ID);
128 >
129 >  if (!data){
130 >    sprintf(painCave.errMsg, "ZConstraint error: can not get tolerance \n");
131 >    painCave.isFatal = 1;
132 >    simError();
133 >  }
134 >  else{
135 >    tolerance = dynamic_cast<DoubleData*>(data);
136 >
137 >    if (!tolerance){
138 >      sprintf(painCave.errMsg,
139 >              "ZConstraint error: Can not get property from SimInfo\n");
140 >      painCave.isFatal = 1;
141 >      simError();
142 >    }
143 >    else{
144 >      this->zconsTol = tolerance->getData();
145 >    }
146 >  }
147 >
148 >  //quick hack here
149 >  data = info->getProperty(ZCONSGAP_ID);
150 >
151 >  if (data){
152 >    gap = dynamic_cast<DoubleData*>(data);
153 >  }
154 >
155 >  if (!gap){
156 >    sprintf(painCave.errMsg,
157 >            "ZConstraint error: Can not get property from SimInfo\n");
158 >    painCave.isFatal = 1;
159 >    simError();
160 >  }
161 >  else{
162 >    this->hasZConsGap = true;
163 >    this->zconsGap = gap->getData();
164 >  }
165 >
166 >  data = info->getProperty(ZCONSFIXTIME_ID);
167 >
168 >  if (data){
169 >    fixtime = dynamic_cast<DoubleData*>(data);
170 >  }
171 >
172 >  if (!fixtime){
173 >    sprintf(painCave.errMsg,
174 >            "ZConstraint error: Can not get property from SimInfo\n");
175 >    painCave.isFatal = 1;
176 >    simError();
177 >  }
178 >  else{
179 >    this->zconsFixTime = fixtime->getData();
180 >  }
181 >
182 >
183 >
184 >  //retrieve index of z-constraint molecules
185 >  data = info->getProperty(ZCONSPARADATA_ID);
186 >  if (!data){
187 >    sprintf(painCave.errMsg,
188 >            "ZConstraint error: If you use an ZConstraint\n"
189 >            " , you must set index of z-constraint molecules.\n");
190 >    painCave.isFatal = 1;
191 >    simError();
192 >  }
193 >  else{
194 >    zConsParaData = dynamic_cast<ZConsParaData*>(data);
195 >
196 >    if (!zConsParaData){
197 >      sprintf(painCave.errMsg,
198 >              "ZConstraint error: Can not get parameters of zconstraint method from SimInfo\n");
199 >      painCave.isFatal = 1;
200 >      simError();
201 >    }
202 >    else{
203 >      parameters = zConsParaData->getData();
204 >
205 >      //check the range of zconsIndex
206 >      //and the minimum value of index is the first one (we already sorted the data)
207 >      //the maximum value of index is the last one
208 >
209 >      int maxIndex;
210 >      int minIndex;
211 >      int totalNumMol;
212 >
213 >      minIndex = (*parameters)[0].zconsIndex;
214 >      if (minIndex < 0){
215 >        sprintf(painCave.errMsg, "ZConstraint error: index is out of range\n");
216 >        painCave.isFatal = 1;
217 >        simError();
218 >      }
219 >
220 >      maxIndex = (*parameters)[parameters->size() - 1].zconsIndex;
221 >
222 > #ifndef IS_MPI
223 >      totalNumMol = nMols;
224 > #else
225 >      totalNumMol = mpiSim->getTotNmol();  
226 > #endif      
227 >
228 >      if (maxIndex > totalNumMol - 1){
229 >        sprintf(painCave.errMsg, "ZConstraint error: index is out of range\n");
230 >        painCave.isFatal = 1;
231 >        simError();
232 >      }
233 >
234 >      //if user does not specify the zpos for the zconstraint molecule
235 >      //its initial z coordinate  will be used as default
236 >      for (int i = 0; i < (int) (parameters->size()); i++){
237 >        if (!(*parameters)[i].havingZPos){
238 > #ifndef IS_MPI
239 >          for (int j = 0; j < nMols; j++){
240 >            if (molecules[j].getGlobalIndex() == (*parameters)[i].zconsIndex){
241 >              molecules[j].getCOM(COM);
242 >              break;
243 >            }
244 >          }
245 > #else
246 >          //query which processor current zconstraint molecule belongs to
247 >          int* MolToProcMap;
248 >          int whichNode;
249 >
250 >          MolToProcMap = mpiSim->getMolToProcMap();
251 >          whichNode = MolToProcMap[(*parameters)[i].zconsIndex];
252 >
253 >          //broadcast the zpos of current z-contraint molecule
254 >          //the node which contain this
255 >
256 >          if (worldRank == whichNode){
257 >            for (int j = 0; j < nMols; j++)
258 >              if (molecules[j].getGlobalIndex() == (*parameters)[i].zconsIndex){
259 >                molecules[j].getCOM(COM);
260 >                break;
261 >              }
262 >          }
263 >
264 >          MPI_Bcast(&COM[whichDirection], 1, MPI_DOUBLE, whichNode,
265 >                    MPI_COMM_WORLD);        
266 > #endif
267 >
268 >          (*parameters)[i].zPos = COM[whichDirection];
269 >
270 >          sprintf(painCave.errMsg,
271 >                  "ZConstraint warning: Does not specify zpos for z-constraint molecule "
272 >                  "initial z coornidate will be used \n");
273 >          painCave.isFatal = 0;
274 >          simError();
275 >        }
276 >      }
277 >    }//end if (!zConsParaData)
278 >
279 >  }//end  if (!data)
280 >
281 >  //  
282 > #ifdef IS_MPI
283 >  update();
284 > #else  
285 >  int searchResult;
286 >
287 >  for (int i = 0; i < nMols; i++){
288 >    searchResult = isZConstraintMol(&molecules[i]);
289 >
290 >    if (searchResult > -1){
291 >      zconsMols.push_back(&molecules[i]);      
292 >      massOfZConsMols.push_back(molecules[i].getTotalMass());  
293 >
294 >      zPos.push_back((*parameters)[searchResult].zPos);
295 >      //       cout << "index: "<< (*parameters)[searchResult].zconsIndex
296 >      //              <<"\tzPos = " << (*parameters)[searchResult].zPos << endl;
297 >
298 >      kz.push_back((*parameters)[searchResult]. kRatio * zForceConst);
299 >      molecules[i].getCOM(COM);
300 >    }
301 >    else{
302 >      unconsMols.push_back(&molecules[i]);
303 >      massOfUnconsMols.push_back(molecules[i].getTotalMass());
304 >    }
305 >  }
306 >
307 >  fz = new double[zconsMols.size()];
308 >  curZPos = new double[zconsMols.size()];
309 >  indexOfZConsMols = new int [zconsMols.size()];
310 >
311 >  if (!fz || !curZPos || !indexOfZConsMols){
312 >    sprintf(painCave.errMsg, "Memory allocation failure in class Zconstraint\n");
313 >    painCave.isFatal = 1;
314 >    simError();
315 >  }
316 >
317 >  //determine the states of z-constraint molecules
318 >  for (int i = 0; i < (int) (zconsMols.size()); i++){
319 >    indexOfZConsMols[i] = zconsMols[i]->getGlobalIndex();
320 >
321 >    zconsMols[i]->getCOM(COM);
322 >    if (fabs(zPos[i] - COM[whichDirection]) < zconsTol){
323 >      states.push_back(zcsFixed);
324 >
325 >      if (hasZConsGap)
326 >        endFixTime.push_back(info->getTime() + zconsFixTime);
327 >    }
328 >    else{
329 >      states.push_back(zcsMoving);
330 >
331 >      if (hasZConsGap)
332 >        endFixTime.push_back(INFINITE_TIME);
333 >    }
334 >  }
335 >
336 > #endif
337 >
338 >  //get total masss of unconstraint molecules
339 >  double totalMassOfUncons_local;
340 >  totalMassOfUncons_local = 0;
341 >
342 >  for (int i = 0; i < (int) (unconsMols.size()); i++)
343 >    totalMassOfUncons_local += unconsMols[i]->getTotalMass();
344 >
345 > #ifndef IS_MPI
346 >  totalMassOfUncons = totalMassOfUncons_local;
347 > #else
348 >  MPI_Allreduce(&totalMassOfUncons_local, &totalMassOfUncons, 1, MPI_DOUBLE,
349 >                MPI_SUM, MPI_COMM_WORLD);  
350 > #endif
351 >
352 >  //get total number of unconstrained atoms
353 >  int nUnconsAtoms_local;
354 >  nUnconsAtoms_local = 0;
355 >  for (int i = 0; i < (int) (unconsMols.size()); i++)
356 >    nUnconsAtoms_local += unconsMols[i]->getNAtoms();
357 >
358 > #ifndef IS_MPI
359 >  totNumOfUnconsAtoms = nUnconsAtoms_local;
360 > #else
361 >  MPI_Allreduce(&nUnconsAtoms_local, &totNumOfUnconsAtoms, 1, MPI_INT, MPI_SUM,
362 >                MPI_COMM_WORLD);  
363 > #endif  
364 >
365 >  forcePolicy->update();
366 > }
367 >
368 > template<typename T> ZConstraint<T>::~ZConstraint(){
369 >  if (fz){
370 >    delete[] fz;
371 >  }
372 >
373 >  if (curZPos){
374 >    delete[] curZPos;
375 >  }
376 >
377 >  if (indexOfZConsMols){
378 >    delete[] indexOfZConsMols;
379 >  }
380 >
381 >  if (fzOut){
382 >    delete fzOut;
383 >  }
384 >
385 >  if (forcePolicy){
386 >    delete forcePolicy;
387 >  }
388 > }
389 >
390 >
391 > /**
392 > *
393 > */
394 >
395 > #ifdef IS_MPI
396 > template<typename T> void ZConstraint<T>::update(){
397 >  double COM[3];
398 >  int index;
399 >
400 >  zconsMols.clear();
401 >  massOfZConsMols.clear();
402 >  zPos.clear();
403 >  kz.clear();
404 >
405 >  unconsMols.clear();
406 >  massOfUnconsMols.clear();
407 >
408 >
409 >  //creat zconsMol and unconsMol lists
410 >  for (int i = 0; i < nMols; i++){
411 >    index = isZConstraintMol(&molecules[i]);
412 >
413 >    if (index > -1){
414 >      zconsMols.push_back(&molecules[i]);      
415 >      zPos.push_back((*parameters)[index].zPos);
416 >      kz.push_back((*parameters)[index].kRatio * zForceConst);
417 >      massOfZConsMols.push_back(molecules[i].getTotalMass());  
418 >
419 >      molecules[i].getCOM(COM);
420 >    }
421 >    else{
422 >      unconsMols.push_back(&molecules[i]);
423 >      massOfUnconsMols.push_back(molecules[i].getTotalMass());
424 >    }
425 >  }
426 >
427 >
428 >  //The reason to declare fz and indexOfZconsMols as pointer to array is
429 >  // that we want to make the MPI communication simple
430 >  if (fz){
431 >    delete[] fz;
432 >  }
433 >
434 >  if (curZPos){
435 >    delete[] curZPos;
436 >  }
437 >
438 >  if (indexOfZConsMols){
439 >    delete[] indexOfZConsMols;
440 >  }
441 >
442 >  if (zconsMols.size() > 0){
443 >    fz = new double[zconsMols.size()];
444 >    curZPos = new double[zconsMols.size()];
445 >    indexOfZConsMols = new int[zconsMols.size()];
446 >
447 >    if (!fz || !curZPos || !indexOfZConsMols){
448 >      sprintf(painCave.errMsg,
449 >              "Memory allocation failure in class Zconstraint\n");
450 >      painCave.isFatal = 1;
451 >      simError();
452 >    }
453 >
454 >    for (int i = 0; i < (int) (zconsMols.size()); i++){
455 >      indexOfZConsMols[i] = zconsMols[i]->getGlobalIndex();
456 >    }
457 >  }
458 >  else{
459 >    fz = NULL;
460 >    curZPos = NULL;
461 >    indexOfZConsMols = NULL;
462 >  }
463 >
464 >  //determine the states of z-constraint molecules
465 >  for (int i = 0; i < (int) (zconsMols.size()); i++){
466 >    zconsMols[i]->getCOM(COM);
467 >    if (fabs(zPos[i] - COM[whichDirection]) < zconsTol){
468 >      states.push_back(zcsFixed);
469 >
470 >      if (hasZConsGap)
471 >        endFixTime.push_back(info->getTime() + zconsFixTime);
472 >    }
473 >    else{
474 >      states.push_back(zcsMoving);
475 >
476 >      if (hasZConsGap)
477 >        endFixTime.push_back(INFINITE_TIME);
478 >    }
479 >  }
480 >  //
481 >  forcePolicy->update();
482 > }
483 >
484 > #endif
485 >
486 > /**
487 > *  Function Name: isZConstraintMol
488 > *  Parameter
489 > *    Molecule* mol
490 > *  Return value:
491 > *    -1, if the molecule is not z-constraint molecule,
492 > *    other non-negative values, its index in indexOfAllZConsMols vector
493 > */
494 >
495 > template<typename T> int ZConstraint<T>::isZConstraintMol(Molecule* mol){
496 >  int index;
497 >  int low;
498 >  int high;
499 >  int mid;
500 >
501 >  index = mol->getGlobalIndex();
502 >
503 >  low = 0;
504 >  high = parameters->size() - 1;
505 >
506 >  //Binary Search (we have sorted the array)  
507 >  while (low <= high){
508 >    mid = (low + high) / 2;
509 >    if ((*parameters)[mid].zconsIndex == index)
510 >      return mid;
511 >    else if ((*parameters)[mid].zconsIndex > index)
512 >      high = mid - 1;
513 >    else
514 >      low = mid + 1;
515 >  }
516 >
517 >  return -1;
518 > }
519 >
520 > template<typename T> void ZConstraint<T>::integrate(){
521 >  // creat zconsWriter  
522 >  fzOut = new ZConsWriter(zconsOutput.c_str(), parameters);  
523 >
524 >  if (!fzOut){
525 >    sprintf(painCave.errMsg, "Memory allocation failure in class Zconstraint\n");
526 >    painCave.isFatal = 1;
527 >    simError();
528 >  }
529 >
530 >  //zero out the velocities of center of mass of unconstrained molecules
531 >  //and the velocities of center of mass of every single z-constrained molecueles
532 >  zeroOutVel();
533 >
534 >  curZconsTime = zconsTime + info->getTime();
535 >
536 >  T::integrate();
537 > }
538 >
539 >
540 > /**
541 > *
542 > *
543 > *
544 > *
545 > */
546 > template<typename T> void ZConstraint<T>::calcForce(int calcPot, int calcStress){
547 >  double zsys;
548 >  double COM[3];
549 >  double force[3];
550 >  double zSysCOMVel;
551 >
552 >  T::calcForce(calcPot, calcStress);
553 >
554 >
555 >  if (hasZConsGap){
556 >    updateZPos();
557 >  }
558 >
559 >  if (checkZConsState()){
560 >    zeroOutVel();    
561 >    forcePolicy->update();
562 >  }  
563 >
564 >  zsys = calcZSys();
565 >  zSysCOMVel = calcSysCOMVel();
566 > #ifdef IS_MPI
567 >  if (worldRank == 0){
568 > #endif
569 >    //cout << "---------------------------------------------------------------------" <<endl;
570 >    //cout << "current time: " << info->getTime() << endl;
571 >    //cout << "center of mass at z: " << zsys << endl;    
572 >    //cout << "before calcForce, the COMVel of system is " << zSysCOMVel <<endl;
573 >
574 > #ifdef IS_MPI
575 >  }
576 > #endif
577 >
578 >  //do zconstraint force;
579 >  if (haveFixedZMols()){
580 >    this->doZconstraintForce();
581 >  }
582 >
583 >  //use harmonical poteintial to move the molecules to the specified positions
584 >  if (haveMovingZMols()){
585 >    this->doHarmonic();
586 >  }
587 >
588 >  //write out forces and current positions of z-constraint molecules
589 >  if (info->getTime() >= curZconsTime){
590 >    for (int i = 0; i < (int) (zconsMols.size()); i++){
591 >      zconsMols[i]->getCOM(COM);
592 >      curZPos[i] = COM[whichDirection];
593 >
594 >      //if the z-constraint molecule is still moving, just record its force
595 >      if (states[i] == zcsMoving){
596 >        fz[i] = 0;
597 >        Atom** movingZAtoms;
598 >        movingZAtoms = zconsMols[i]->getMyAtoms();
599 >        for (int j = 0; j < zconsMols[i]->getNAtoms(); j++){
600 >          movingZAtoms[j]->getFrc(force);
601 >          fz[i] += force[whichDirection];
602 >        }
603 >      }
604 >    }
605 >    fzOut->writeFZ(info->getTime(), zconsMols.size(), indexOfZConsMols, fz,
606 >                   curZPos, &zPos[0]);
607 >    curZconsTime += zconsTime;
608 >  }
609 >
610 >  zSysCOMVel = calcSysCOMVel();  
611 > #ifdef IS_MPI
612 >  if (worldRank == 0){
613 > #endif
614 >    //cout << "after calcForce, the COMVel of system is " << zSysCOMVel <<endl;
615 > #ifdef IS_MPI
616 >  }
617 > #endif
618 > }
619 >
620 >
621 > /**
622 > *
623 > */
624 >
625 > template<typename T> double ZConstraint<T>::calcZSys(){
626 >  //calculate reference z coordinate for z-constraint molecules
627 >  double totalMass_local;
628 >  double totalMass;
629 >  double totalMZ_local;
630 >  double totalMZ;
631 >  double massOfCurMol;
632 >  double COM[3];
633 >
634 >  totalMass_local = 0;
635 >  totalMZ_local = 0;
636 >
637 >  for (int i = 0; i < nMols; i++){
638 >    massOfCurMol = molecules[i].getTotalMass();
639 >    molecules[i].getCOM(COM);
640 >
641 >    totalMass_local += massOfCurMol;
642 >    totalMZ_local += massOfCurMol * COM[whichDirection];
643 >  }
644 >
645 >
646 > #ifdef IS_MPI  
647 >  MPI_Allreduce(&totalMass_local, &totalMass, 1, MPI_DOUBLE, MPI_SUM,
648 >                MPI_COMM_WORLD);
649 >  MPI_Allreduce(&totalMZ_local, &totalMZ, 1, MPI_DOUBLE, MPI_SUM, MPI_COMM_WORLD);  
650 > #else
651 >  totalMass = totalMass_local;
652 >  totalMZ = totalMZ_local;
653 > #endif  
654 >
655 >  double zsys;
656 >  zsys = totalMZ / totalMass;
657 >
658 >  return zsys;
659 > }
660 >
661 > /**
662 > *
663 > */
664 > template<typename T> void ZConstraint<T>::thermalize(void){
665 >  T::thermalize();
666 >  zeroOutVel();
667 > }
668 >
669 > /**
670 > *
671 > */
672 >
673 > template<typename T> void ZConstraint<T>::zeroOutVel(){
674 >  Atom** fixedZAtoms;  
675 >  double COMvel[3];
676 >  double vel[3];
677 >  double zSysCOMVel;
678 >
679 >  //zero out the velocities of center of mass of fixed z-constrained molecules
680 >
681 >  for (int i = 0; i < (int) (zconsMols.size()); i++){
682 >    if (states[i] == zcsFixed){
683 >      zconsMols[i]->getCOMvel(COMvel);      
684 >      //cout << "before resetting " << indexOfZConsMols[i] <<"'s vz is " << COMvel[whichDirection] << endl;
685 >
686 >      fixedZAtoms = zconsMols[i]->getMyAtoms();
687 >
688 >      for (int j = 0; j < zconsMols[i]->getNAtoms(); j++){
689 >        fixedZAtoms[j]->getVel(vel);
690 >        vel[whichDirection] -= COMvel[whichDirection];
691 >        fixedZAtoms[j]->setVel(vel);
692 >      }
693 >
694 >      zconsMols[i]->getCOMvel(COMvel);
695 >      //cout << "after resetting " << indexOfZConsMols[i] <<"'s vz is " << COMvel[whichDirection] << endl;
696 >    }
697 >  }
698 >
699 >  //cout << "before resetting the COMVel of moving molecules is " << calcMovingMolsCOMVel() <<endl;
700 >
701 >  zSysCOMVel = calcSysCOMVel();
702 > #ifdef IS_MPI
703 >  if (worldRank == 0){
704 > #endif
705 >    //cout << "before resetting the COMVel of sytem is " << zSysCOMVel << endl;  
706 > #ifdef IS_MPI
707 >  }
708 > #endif
709 >
710 >  // calculate the vz of center of mass of unconstrained molecules and moving z-constrained molecules
711 >  double MVzOfMovingMols_local;
712 >  double MVzOfMovingMols;
713 >  double totalMassOfMovingZMols_local;
714 >  double totalMassOfMovingZMols;
715 >
716 >  MVzOfMovingMols_local = 0;
717 >  totalMassOfMovingZMols_local = 0;
718 >
719 >  for (int i = 0; i < (int) (unconsMols.size()); i++){
720 >    unconsMols[i]->getCOMvel(COMvel);
721 >    MVzOfMovingMols_local += massOfUnconsMols[i] * COMvel[whichDirection];
722 >  }
723 >
724 >  for (int i = 0; i < (int) (zconsMols.size()); i++){
725 >    if (states[i] == zcsMoving){
726 >      zconsMols[i]->getCOMvel(COMvel);
727 >      MVzOfMovingMols_local += massOfZConsMols[i] * COMvel[whichDirection];  
728 >      totalMassOfMovingZMols_local += massOfZConsMols[i];
729 >    }
730 >  }
731 >
732 > #ifndef IS_MPI
733 >  MVzOfMovingMols = MVzOfMovingMols_local;
734 >  totalMassOfMovingZMols = totalMassOfMovingZMols_local;
735 > #else
736 >  MPI_Allreduce(&MVzOfMovingMols_local, &MVzOfMovingMols, 1, MPI_DOUBLE,
737 >                MPI_SUM, MPI_COMM_WORLD);
738 >  MPI_Allreduce(&totalMassOfMovingZMols_local, &totalMassOfMovingZMols, 1,
739 >                MPI_DOUBLE, MPI_SUM, MPI_COMM_WORLD);  
740 > #endif
741 >
742 >  double vzOfMovingMols;
743 >  vzOfMovingMols = MVzOfMovingMols /
744 >                   (totalMassOfUncons + totalMassOfMovingZMols);
745 >
746 >  //modify the velocites of unconstrained molecules  
747 >  Atom** unconsAtoms;
748 >  for (int i = 0; i < (int) (unconsMols.size()); i++){
749 >    unconsAtoms = unconsMols[i]->getMyAtoms();
750 >    for (int j = 0; j < unconsMols[i]->getNAtoms(); j++){
751 >      unconsAtoms[j]->getVel(vel);
752 >      vel[whichDirection] -= vzOfMovingMols;
753 >      unconsAtoms[j]->setVel(vel);
754 >    }
755 >  }  
756 >
757 >  //modify the velocities of moving z-constrained molecuels
758 >  Atom** movingZAtoms;
759 >  for (int i = 0; i < (int) (zconsMols.size()); i++){
760 >    if (states[i] == zcsMoving){
761 >      movingZAtoms = zconsMols[i]->getMyAtoms();
762 >      for (int j = 0; j < zconsMols[i]->getNAtoms(); j++){
763 >        movingZAtoms[j]->getVel(vel);
764 >        vel[whichDirection] -= vzOfMovingMols;
765 >        movingZAtoms[j]->setVel(vel);
766 >      }
767 >    }
768 >  }
769 >
770 >
771 >  zSysCOMVel = calcSysCOMVel();
772 > #ifdef IS_MPI
773 >  if (worldRank == 0){
774 > #endif
775 >    //cout << "after resetting the COMVel of moving molecules is " << zSysCOMVel << endl;  
776 > #ifdef IS_MPI
777 >  }
778 > #endif
779 > }
780 >
781 > /**
782 > *
783 > */
784 >
785 > template<typename T> void ZConstraint<T>::doZconstraintForce(){
786 >  Atom** zconsAtoms;
787 >  double totalFZ;
788 >  double totalFZ_local;
789 >  double COM[3];
790 >  double force[3];
791 >
792 >  //constrain the molecules which do not reach the specified positions  
793 >
794 >  //Zero Out the force of z-contrained molecules    
795 >  totalFZ_local = 0;
796 >
797 >  //calculate the total z-contrained force of fixed z-contrained molecules
798 >
799 >  //cout << "before zero out z-constraint force on fixed z-constraint molecuels "
800 >  //       << "total force is " << calcTotalForce() << endl;
801 >
802 >  for (int i = 0; i < (int) (zconsMols.size()); i++){
803 >    if (states[i] == zcsFixed){
804 >      zconsMols[i]->getCOM(COM);
805 >      zconsAtoms = zconsMols[i]->getMyAtoms();  
806 >
807 >      fz[i] = 0;      
808 >      for (int j = 0; j < zconsMols[i]->getNAtoms(); j++){
809 >        zconsAtoms[j]->getFrc(force);
810 >        fz[i] += force[whichDirection];
811 >      }
812 >      totalFZ_local += fz[i];
813 >
814 >      //cout << "Fixed Molecule\tindex: " << indexOfZConsMols[i]
815 >      //      <<"\tcurrent zpos: " << COM[whichDirection]
816 >      //      << "\tcurrent fz: " <<fz[i] << endl;
817 >    }
818 >  }
819 >
820 >  //calculate total z-constraint force
821 > #ifdef IS_MPI
822 >  MPI_Allreduce(&totalFZ_local, &totalFZ, 1, MPI_DOUBLE, MPI_SUM, MPI_COMM_WORLD);
823 > #else
824 >  totalFZ = totalFZ_local;
825 > #endif
826 >
827 >
828 >  // apply negative to fixed z-constrained molecues;
829 >  force[0] = 0;
830 >  force[1] = 0;
831 >  force[2] = 0;
832 >
833 >  for (int i = 0; i < (int) (zconsMols.size()); i++){
834 >    if (states[i] == zcsFixed){
835 >      int nAtomOfCurZConsMol = zconsMols[i]->getNAtoms();
836 >      zconsAtoms = zconsMols[i]->getMyAtoms();  
837 >
838 >      for (int j = 0; j < nAtomOfCurZConsMol; j++){
839 >        //force[whichDirection] = -fz[i]/ nAtomOfCurZConsMol;
840 >        force[whichDirection] = -forcePolicy->getZFOfFixedZMols(zconsMols[i],
841 >                                                                zconsAtoms[j],
842 >                                                                fz[i]);
843 >        zconsAtoms[j]->addFrc(force);
844 >      }
845 >    }
846 >  }
847 >
848 >  //cout << "after zero out z-constraint force on fixed z-constraint molecuels "
849 >  //      << "total force is " << calcTotalForce() << endl;
850 >
851 >
852 >  force[0] = 0;
853 >  force[1] = 0;
854 >  force[2] = 0;
855 >
856 >  //modify the forces of unconstrained molecules
857 >  for (int i = 0; i < (int) (unconsMols.size()); i++){
858 >    Atom** unconsAtoms = unconsMols[i]->getMyAtoms();
859 >
860 >    for (int j = 0; j < unconsMols[i]->getNAtoms(); j++){
861 >      //force[whichDirection] = totalFZ / (totNumOfUnconsAtoms + nMovingZAtoms);
862 >      force[whichDirection] = forcePolicy->getZFOfMovingMols(unconsAtoms[j],
863 >                                                             totalFZ);
864 >      unconsAtoms[j]->addFrc(force);
865 >    }
866 >  }      
867 >
868 >  //modify the forces of moving z-constrained molecules
869 >  for (int i = 0; i < (int) (zconsMols.size()); i++){
870 >    if (states[i] == zcsMoving){
871 >      Atom** movingZAtoms = zconsMols[i]->getMyAtoms();    
872 >
873 >      for (int j = 0; j < zconsMols[i]->getNAtoms(); j++){
874 >        //force[whichDirection] = totalFZ / (totNumOfUnconsAtoms + nMovingZAtoms);
875 >        force[whichDirection] = forcePolicy->getZFOfMovingMols(movingZAtoms[j],
876 >                                                               totalFZ);
877 >        movingZAtoms[j]->addFrc(force);
878 >      }
879 >    }
880 >  }
881 >  //  cout << "after substracting z-constraint force from moving molecuels "
882 >  //        << "total force is " << calcTotalForce()  << endl;
883 > }
884 >
885 > /**
886 >  *
887 >  *
888 >  */
889 >
890 > template<typename T> void ZConstraint<T>::doHarmonic(){
891 >  double force[3];
892 >  double harmonicU;
893 >  double harmonicF;
894 >  double COM[3];
895 >  double diff;
896 >  double totalFZ_local;
897 >  double totalFZ;
898 >
899 >  force[0] = 0;
900 >  force[1] = 0;
901 >  force[2] = 0;
902 >
903 >  totalFZ_local = 0;
904 >
905 >  for (int i = 0; i < (int) (zconsMols.size()); i++){
906 >    if (states[i] == zcsMoving){
907 >      zconsMols[i]->getCOM(COM);
908 >      //       cout << "Moving Molecule\tindex: " << indexOfZConsMols[i]
909 >      //     << "\tcurrent zpos: " << COM[whichDirection] << endl;
910 >
911 >      diff = COM[whichDirection] - zPos[i];
912 >
913 >      harmonicU = 0.5 * kz[i] * diff * diff;  
914 >      info->lrPot += harmonicU;
915 >
916 >      harmonicF = -kz[i] * diff;
917 >      totalFZ_local += harmonicF;
918 >
919 >      //adjust force
920 >
921 >      Atom** movingZAtoms = zconsMols[i]->getMyAtoms();    
922 >
923 >      for (int j = 0; j < zconsMols[i]->getNAtoms(); j++){
924 >        //force[whichDirection] = harmonicF / zconsMols[i]->getNAtoms();
925 >        force[whichDirection] = forcePolicy->getHFOfFixedZMols(zconsMols[i],
926 >                                                               movingZAtoms[j],
927 >                                                               harmonicF);
928 >        movingZAtoms[j]->addFrc(force);
929 >      }
930 >    }
931 >  }
932 >
933 > #ifndef IS_MPI
934 >  totalFZ = totalFZ_local;
935 > #else
936 >  MPI_Allreduce(&totalFZ_local, &totalFZ, 1, MPI_DOUBLE, MPI_SUM, MPI_COMM_WORLD);  
937 > #endif
938 >
939 >  //cout << "before substracting harmonic force from moving molecuels "
940 >  //      << "total force is " << calcTotalForce()  << endl;
941 >
942 >  force[0] = 0;
943 >  force[1] = 0;
944 >  force[2] = 0;
945 >
946 >  //modify the forces of unconstrained molecules
947 >  for (int i = 0; i < (int) (unconsMols.size()); i++){
948 >    Atom** unconsAtoms = unconsMols[i]->getMyAtoms();
949 >
950 >    for (int j = 0; j < unconsMols[i]->getNAtoms(); j++){
951 >      //force[whichDirection] = - totalFZ /totNumOfUnconsAtoms;
952 >      force[whichDirection] = -forcePolicy->getHFOfUnconsMols(unconsAtoms[j],
953 >                                                              totalFZ);
954 >      unconsAtoms[j]->addFrc(force);
955 >    }
956 >  }  
957 >
958 >  //cout << "after substracting harmonic force from moving molecuels "
959 >  //      << "total force is " << calcTotalForce()  << endl;
960 > }
961 >
962 > /**
963 > *
964 > */
965 >
966 > template<typename T> bool ZConstraint<T>::checkZConsState(){
967 >  double COM[3];
968 >  double diff;
969 >
970 >  int changed_local;
971 >  int changed;
972 >
973 >  changed_local = 0;
974 >
975 >  for (int i = 0; i < (int) (zconsMols.size()); i++){
976 >    zconsMols[i]->getCOM(COM);
977 >    diff = fabs(COM[whichDirection] - zPos[i]);  
978 >    if (diff <= zconsTol && states[i] == zcsMoving){
979 >      states[i] = zcsFixed;
980 >      changed_local = 1;
981 >
982 >      if (hasZConsGap)
983 >        endFixTime[i] = info->getTime() + zconsFixTime;
984 >    }
985 >    else if (diff > zconsTol && states[i] == zcsFixed){
986 >      states[i] = zcsMoving;
987 >      changed_local = 1;  
988 >
989 >      if (hasZConsGap)
990 >        endFixTime[i] = INFINITE_TIME;
991 >    }
992 >  }
993 >
994 > #ifndef IS_MPI
995 >  changed = changed_local;
996 > #else
997 >  MPI_Allreduce(&changed_local, &changed, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD);
998 > #endif
999 >
1000 >  return (changed > 0);
1001 > }
1002 >
1003 > template<typename T> bool ZConstraint<T>::haveFixedZMols(){
1004 >  int havingFixed_local;
1005 >  int havingFixed;
1006 >
1007 >  havingFixed_local = 0;
1008 >
1009 >  for (int i = 0; i < (int) (zconsMols.size()); i++)
1010 >    if (states[i] == zcsFixed){
1011 >      havingFixed_local = 1;
1012 >      break;
1013 >    }
1014 >
1015 > #ifndef IS_MPI
1016 >  havingFixed = havingFixed_local;
1017 > #else
1018 >  MPI_Allreduce(&havingFixed_local, &havingFixed, 1, MPI_INT, MPI_SUM,
1019 >                MPI_COMM_WORLD);
1020 > #endif
1021 >
1022 >  return (havingFixed > 0);
1023 > }
1024 >
1025 >
1026 > /**
1027 > *
1028 > */
1029 > template<typename T> bool ZConstraint<T>::haveMovingZMols(){
1030 >  int havingMoving_local;
1031 >  int havingMoving;
1032 >
1033 >  havingMoving_local = 0;
1034 >
1035 >  for (int i = 0; i < (int) (zconsMols.size()); i++)
1036 >    if (states[i] == zcsMoving){
1037 >      havingMoving_local = 1;
1038 >      break;
1039 >    }
1040 >
1041 > #ifndef IS_MPI
1042 >  havingMoving = havingMoving_local;
1043 > #else
1044 >  MPI_Allreduce(&havingMoving_local, &havingMoving, 1, MPI_INT, MPI_SUM,
1045 >                MPI_COMM_WORLD);
1046 > #endif
1047 >
1048 >  return (havingMoving > 0);
1049 > }
1050 >
1051 > /**
1052 > *
1053 > */
1054 >
1055 > template<typename T> double ZConstraint<T>::calcMovingMolsCOMVel(){
1056 >  double MVzOfMovingMols_local;
1057 >  double MVzOfMovingMols;
1058 >  double totalMassOfMovingZMols_local;
1059 >  double totalMassOfMovingZMols;
1060 >  double COMvel[3];
1061 >
1062 >  MVzOfMovingMols_local = 0;
1063 >  totalMassOfMovingZMols_local = 0;
1064 >
1065 >  for (int i = 0; i < unconsMols.size(); i++){
1066 >    unconsMols[i]->getCOMvel(COMvel);
1067 >    MVzOfMovingMols_local += massOfUnconsMols[i] * COMvel[whichDirection];
1068 >  }
1069 >
1070 >  for (int i = 0; i < zconsMols.size(); i++){
1071 >    if (states[i] == zcsMoving){
1072 >      zconsMols[i]->getCOMvel(COMvel);
1073 >      MVzOfMovingMols_local += massOfZConsMols[i] * COMvel[whichDirection];  
1074 >      totalMassOfMovingZMols_local += massOfZConsMols[i];
1075 >    }
1076 >  }
1077 >
1078 > #ifndef IS_MPI
1079 >  MVzOfMovingMols = MVzOfMovingMols_local;
1080 >  totalMassOfMovingZMols = totalMassOfMovingZMols_local;
1081 > #else
1082 >  MPI_Allreduce(&MVzOfMovingMols_local, &MVzOfMovingMols, 1, MPI_DOUBLE,
1083 >                MPI_SUM, MPI_COMM_WORLD);
1084 >  MPI_Allreduce(&totalMassOfMovingZMols_local, &totalMassOfMovingZMols, 1,
1085 >                MPI_DOUBLE, MPI_SUM, MPI_COMM_WORLD);  
1086 > #endif
1087 >
1088 >  double vzOfMovingMols;
1089 >  vzOfMovingMols = MVzOfMovingMols /
1090 >                   (totalMassOfUncons + totalMassOfMovingZMols);
1091 >
1092 >  return vzOfMovingMols;
1093 > }
1094 >
1095 > /**
1096 > *
1097 > */
1098 >
1099 > template<typename T> double ZConstraint<T>::calcSysCOMVel(){
1100 >  double COMvel[3];
1101 >  double tempMVz_local;
1102 >  double tempMVz;
1103 >  double massOfZCons_local;
1104 >  double massOfZCons;
1105 >
1106 >
1107 >  tempMVz_local = 0;
1108 >
1109 >  for (int i = 0 ; i < nMols; i++){
1110 >    molecules[i].getCOMvel(COMvel);
1111 >    tempMVz_local += molecules[i].getTotalMass() * COMvel[whichDirection];
1112 >  }
1113 >
1114 >  massOfZCons_local = 0;
1115 >
1116 >  for (int i = 0; i < (int) (massOfZConsMols.size()); i++){
1117 >    massOfZCons_local += massOfZConsMols[i];
1118 >  }
1119 > #ifndef IS_MPI
1120 >  massOfZCons = massOfZCons_local;
1121 >  tempMVz = tempMVz_local;
1122 > #else
1123 >  MPI_Allreduce(&massOfZCons_local, &massOfZCons, 1, MPI_DOUBLE, MPI_SUM,
1124 >                MPI_COMM_WORLD);
1125 >  MPI_Allreduce(&tempMVz_local, &tempMVz, 1, MPI_DOUBLE, MPI_SUM, MPI_COMM_WORLD);
1126 > #endif
1127 >
1128 >  return tempMVz / (totalMassOfUncons + massOfZCons);
1129 > }
1130 >
1131 > /**
1132 > *
1133 > */
1134 >
1135 > template<typename T> double ZConstraint<T>::calcTotalForce(){
1136 >  double force[3];  
1137 >  double totalForce_local;
1138 >  double totalForce;
1139 >
1140 >  totalForce_local = 0;
1141 >
1142 >  for (int i = 0; i < nAtoms; i++){
1143 >    atoms[i]->getFrc(force);
1144 >    totalForce_local += force[whichDirection];
1145 >  }
1146 >
1147 > #ifndef IS_MPI
1148 >  totalForce = totalForce_local;
1149 > #else
1150 >  MPI_Allreduce(&totalForce_local, &totalForce, 1, MPI_DOUBLE, MPI_SUM,
1151 >                MPI_COMM_WORLD);
1152 > #endif
1153 >
1154 >  return totalForce;
1155 > }
1156 >
1157 > /**
1158 > *
1159 > */
1160 >
1161 > template<typename T> void ZConstraint<T>::PolicyByNumber::update(){
1162 >  //calculate the number of atoms of moving z-constrained molecules
1163 >  int nMovingZAtoms_local;
1164 >  int nMovingZAtoms;
1165 >
1166 >  nMovingZAtoms_local = 0;
1167 >  for (int i = 0; i < (int) ((zconsIntegrator->zconsMols).size()); i++)
1168 >    if ((zconsIntegrator->states)[i] == (zconsIntegrator->zcsMoving)){
1169 >      nMovingZAtoms_local += (zconsIntegrator->zconsMols)[i]->getNAtoms();
1170 >    }
1171 >
1172 > #ifdef IS_MPI
1173 >  MPI_Allreduce(&nMovingZAtoms_local, &nMovingZAtoms, 1, MPI_INT, MPI_SUM,
1174 >                MPI_COMM_WORLD);
1175 > #else
1176 >  nMovingZAtoms = nMovingZAtoms_local;
1177 > #endif
1178 >  totNumOfMovingAtoms = nMovingZAtoms + zconsIntegrator->totNumOfUnconsAtoms;
1179 > }
1180 >
1181 > template<typename T> double ZConstraint<T>::PolicyByNumber::getZFOfFixedZMols(Molecule* mol,
1182 >                                                                              Atom* atom,
1183 >                                                                              double totalForce){
1184 >  return totalForce / mol->getNAtoms();
1185 > }
1186 >
1187 > template<typename T> double ZConstraint<T>::PolicyByNumber::getZFOfMovingMols(Atom* atom,
1188 >                                                                              double totalForce){
1189 >  return totalForce / totNumOfMovingAtoms;
1190 > }
1191 >
1192 > template<typename T> double ZConstraint<T>::PolicyByNumber::getHFOfFixedZMols(Molecule* mol,
1193 >                                                                              Atom* atom,
1194 >                                                                              double totalForce){
1195 >  return totalForce / mol->getNAtoms();
1196 > }
1197 >
1198 > template<typename T> double ZConstraint<T>::PolicyByNumber::getHFOfUnconsMols(Atom* atom,
1199 >                                                                              double totalForce){
1200 >  return totalForce / zconsIntegrator->totNumOfUnconsAtoms;
1201 > }
1202 >
1203 > /**
1204 > *
1205 > */
1206 >
1207 > template<typename T> void ZConstraint<T>::PolicyByMass::update(){
1208 >  //calculate the number of atoms of moving z-constrained molecules
1209 >  double massOfMovingZAtoms_local;
1210 >  double massOfMovingZAtoms;
1211 >
1212 >  massOfMovingZAtoms_local = 0;
1213 >  for (int i = 0; i < (int) ((zconsIntegrator->zconsMols).size()); i++)
1214 >    if ((zconsIntegrator->states)[i] == (zconsIntegrator->zcsMoving)){
1215 >      massOfMovingZAtoms_local += (zconsIntegrator->zconsMols)[i]->getTotalMass();
1216 >    }
1217 >
1218 > #ifdef IS_MPI
1219 >  MPI_Allreduce(&massOfMovingZAtoms_local, &massOfMovingZAtoms, 1, MPI_DOUBLE,
1220 >                MPI_SUM, MPI_COMM_WORLD);
1221 > #else
1222 >  massOfMovingZAtoms = massOfMovingZAtoms_local;
1223 > #endif
1224 >  totMassOfMovingAtoms = massOfMovingZAtoms +
1225 >                         zconsIntegrator->totalMassOfUncons;
1226 > }
1227 >
1228 > template<typename T> double ZConstraint<T>::PolicyByMass::getZFOfFixedZMols(Molecule* mol,
1229 >                                                                            Atom* atom,
1230 >                                                                            double totalForce){
1231 >  return totalForce * atom->getMass() / mol->getTotalMass();
1232 > }
1233 >
1234 > template<typename T> double ZConstraint<T>::PolicyByMass::getZFOfMovingMols(Atom* atom,
1235 >                                                                            double totalForce){
1236 >  return totalForce * atom->getMass() / totMassOfMovingAtoms;
1237 > }
1238 >
1239 > template<typename T> double ZConstraint<T>::PolicyByMass::getHFOfFixedZMols(Molecule* mol,
1240 >                                                                            Atom* atom,
1241 >                                                                            double totalForce){
1242 >  return totalForce * atom->getMass() / mol->getTotalMass();
1243 > }
1244 >
1245 > template<typename T> double ZConstraint<T>::PolicyByMass::getHFOfUnconsMols(Atom* atom,
1246 >                                                                            double totalForce){
1247 >  return totalForce * atom->getMass() / zconsIntegrator->totalMassOfUncons;
1248 > }
1249 >
1250 > template<typename T> void ZConstraint<T>::updateZPos(){
1251 >  double curTime;
1252 >
1253 >  curTime = info->getTime();
1254 >
1255 >  for (size_t i = 0; i < zconsMols.size(); i++){
1256 >    if (states[i] == zcsFixed && curTime >= endFixTime[i]){
1257 >      zPos[i] += zconsGap;
1258 >    }
1259 >  }
1260 > }

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