ObjectCount.cpp

/*
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 *
 * SUPPORT OPEN SCIENCE!  If you use OpenMD or its source code in your
 * research, please cite the appropriate papers when you publish your
 * work.  Good starting points are:
 *
 * [1] Meineke, et al., J. Comp. Chem. 26, 252-271 (2005).
 * [2] Fennell & Gezelter, J. Chem. Phys. 124, 234104 (2006).
 * [3] Sun, Lin & Gezelter, J. Chem. Phys. 128, 234107 (2008).
 * [4] Vardeman, Stocker & Gezelter, J. Chem. Theory Comput. 7, 834 (2011).
 * [5] Kuang & Gezelter, Mol. Phys., 110, 691-701 (2012).
 * [6] Lamichhane, Gezelter & Newman, J. Chem. Phys. 141, 134109 (2014).
 * [7] Lamichhane, Newman & Gezelter, J. Chem. Phys. 141, 134110 (2014).
 * [8] Bhattarai, Newman & Gezelter, Phys. Rev. B 99, 094106 (2019).
 */
 
#include "applications/staticProps/ObjectCount.hpp"
 
#include <algorithm>
#include <functional>
 
#include "io/DumpReader.hpp"
#include "primitives/Molecule.hpp"
#include "utils/simError.h"
 
namespace OpenMD {
 
  ObjectCount::ObjectCount(SimInfo* info, const std::string& filename,
                           const std::string& sele) :
      StaticAnalyser(info, filename, 1),
      selectionScript_(sele), seleMan_(info), evaluator_(info) {
    setOutputName(getPrefix(filename) + ".counts");
 
    evaluator_.loadScriptString(sele);
 
    if (!evaluator_.isDynamic()) {
      seleMan_.setSelectionSet(evaluator_.evaluate());
    }
  }
 
  void ObjectCount::process() {
    counts_.clear();
    counts_.resize(10, 0);
    DumpReader reader(info_, dumpFilename_);
    int nFrames             = reader.getNFrames();
    unsigned long int nsum  = 0;
    unsigned long int n2sum = 0;
 
    for (int i = 0; i < nFrames; i += step_) {
      reader.readFrame(i);
      currentSnapshot_ = info_->getSnapshotManager()->getCurrentSnapshot();
 
      if (evaluator_.isDynamic()) {
        seleMan_.setSelectionSet(evaluator_.evaluate());
      }
 
      unsigned int count = seleMan_.getSelectionCount();
 
      if (counts_.size() < count + 1) { counts_.resize(count + 1, 0); }
 
      counts_[count]++;
 
      nsum += count;
      n2sum += count * count;
    }
 
    int nProcessed = nFrames / step_;
 
    nAvg  = nsum / nProcessed;
    n2Avg = n2sum / nProcessed;
    sDev  = sqrt(n2Avg - nAvg * nAvg);
    writeCounts();
  }
 
  void ObjectCount::writeCounts() {
    std::ofstream ofs(outputFilename_.c_str(), std::ios::binary);
    if (ofs.is_open()) {
      ofs << "#counts\n";
      ofs << "#selection: (" << selectionScript_ << ")\n";
      ofs << "# <N> = " << nAvg << "\n";
      ofs << "# <N^2> = " << n2Avg << "\n";
      ofs << "# sqrt(<N^2> - <N>^2)  = " << sDev << "\n";
      ofs << "# N\tcounts[N]\n";
      for (unsigned int i = 0; i < counts_.size(); ++i) {
        ofs << i << "\t" << counts_[i] << "\n";
      }
 
    } else {
      snprintf(painCave.errMsg, MAX_SIM_ERROR_MSG_LENGTH,
               "ObjectCount: unable to open %s\n", outputFilename_.c_str());
      painCave.isFatal = 1;
      simError();
    }
    ofs.close();
  }
 
}  // namespace OpenMD