EquidistantSequence.cc

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#include <cmath>
#include "JetMETCorrections/InterpolationTables/interface/NpstatException.h"

#include "JetMETCorrections/InterpolationTables/interface/EquidistantSequence.h"

namespace npstat {
  EquidistantInLinearSpace::EquidistantInLinearSpace(const double minScale,
                                                     const double maxScale,
                                                     const unsigned nScales)
      : std::vector<double>() {
    switch (nScales) {
      case 0:
        break;

      case 1: {
        this->reserve(nScales);
        const double sc = (minScale == maxScale ? minScale : (minScale + maxScale) / 2.0);
        push_back(sc);
      } break;

      default: {
        this->reserve(nScales);
        const double step = (maxScale - minScale) / (nScales - 1);
        push_back(minScale);
        for (unsigned i = 1; i < nScales - 1; ++i)
          push_back(minScale + i * step);
        push_back(maxScale);
      } break;
    }
  }

  EquidistantInLogSpace::EquidistantInLogSpace(const double minScale, const double maxScale, const unsigned nScales)
      : std::vector<double>() {
    if (nScales)
      if (!(minScale > 0.0 && maxScale > 0.0))
        throw npstat::NpstatInvalidArgument(
            "In npstat::EquidistantInLogSpace constructor: "
            "minimum and maximum scales must be positive");
    switch (nScales) {
      case 0:
        break;

      case 1: {
        this->reserve(nScales);
        const double sc = (minScale == maxScale ? minScale : sqrt(minScale * maxScale));
        push_back(sc);
      } break;

      default: {
        this->reserve(nScales);
        const double logmax = log(maxScale);
        const double logmin = log(minScale);
        const double logstep = (logmax - logmin) / (nScales - 1);
        push_back(minScale);
        for (unsigned i = 1; i < nScales - 1; ++i)
          push_back(exp(logmin + i * logstep));
        push_back(maxScale);
      } break;
    }
  }
}  // namespace npstat