TotemT2Segmentation Class Reference

#include <TotemT2Segmentation.h>

Public Member Functions
void	fill (TH2D *, const TotemT2DetId &, double value=1.)
	TotemT2Segmentation (size_t, size_t)

Private Member Functions
std::vector< std::pair< short, short > >	computeBins (const TotemT2DetId &detid) const

Private Attributes
std::unordered_map< TotemT2DetId, std::vector< std::pair< short, short > > >	bins_map_
const size_t	nbinsx_
const size_t	nbinsy_

Detailed Description

Definition at line 19 of file TotemT2Segmentation.h.

Constructor & Destructor Documentation

TotemT2Segmentation()

TotemT2Segmentation::TotemT2Segmentation ( size_t  nbinsx, size_t  nbinsy  )

explicit

Definition at line 16 of file TotemT2Segmentation.cc.

References protons_cff::arm, bins_map_, computeBins(), l1ctLayer2EG_cff::id, CTPPSDetId::maxArm, TotemT2DetId::maxChannel, and TotemT2DetId::maxPlane.

                                                                     : nbinsx_(nbinsx), nbinsy_(nbinsy) {
  for (unsigned short arm = 0; arm <= CTPPSDetId::maxArm; ++arm)
    for (unsigned short plane = 0; plane <= TotemT2DetId::maxPlane; ++plane)
      for (unsigned short id = 0; id <= TotemT2DetId::maxChannel; ++id) {
        const TotemT2DetId detid(arm, plane, id);
        bins_map_[detid] = computeBins(detid);
      }
}

Member Function Documentation

computeBins()

std::vector< std::pair< short, short > > TotemT2Segmentation::computeBins ( const TotemT2DetId &  detid ) const

private

Definition at line 38 of file TotemT2Segmentation.cc.

References trigObjTnPSource_cfi::bins, reco::ceil(), TotemT2DetId::channel(), M_PI, nbinsx_, nbinsy_, TotemT2DetId::plane(), and conifer::pow().

Referenced by TotemT2Segmentation().

                                                                                                  {
  std::vector<std::pair<short, short> > bins;
  // find the histogram centre
  const auto ox = floor(nbinsx_ * 0.5), oy = floor(nbinsy_ * 0.5);
  // compute the ellipse parameters
  const auto ax = ceil(nbinsx_ * 0.5), by = ceil(nbinsy_ * 0.5);

  const float max_half_angle_rad = 0.3;

  // Without use of the Totem Geometry, follow an octant-division of channels,
  // with even and odd planes alternating around the circle. Starting at 9AM
  // and going clockwise around in increments of 1h30min=45deg, we have
  // Ch0 on even planes, Ch0+odd, Ch1+even, Ch1+odd, up to Ch3+odd at 7:30PM

  const float tile_angle_rad = (180 - 45. / 2 - (detid.plane() % 2 ? 45 : 0) - (detid.channel() * 90)) * M_PI / 180.;
  // Geometric way of associating a DetId to a vector<ix, iy> of bins given the size (nx_, ny_) of
  // the TH2D('s) to be filled
  for (size_t ix = 0; ix < nbinsx_; ++ix)
    for (size_t iy = 0; iy < nbinsy_; ++iy) {
      const auto ell_rad_norm = std::pow((ix - ox) / ax, 2) + std::pow((iy - oy) / by, 2);
      if (ell_rad_norm < 1. && ell_rad_norm >= 0.1 &&
          fabs(std::atan2(iy - oy, ix - ox) - tile_angle_rad) < max_half_angle_rad)
        bins.emplace_back(ix, iy);
    }

  return bins;
}

fill()

void TotemT2Segmentation::fill	(	TH2D *	hist,
		const TotemT2DetId &	detid,
		double	value = 1.
	)

Definition at line 25 of file TotemT2Segmentation.cc.

References newFWLiteAna::bin, bins_map_, Exception, compareTotals::hist, nbinsx_, and nbinsy_.

                                                                                  {
  if (bins_map_.count(detid) == 0)
    throw cms::Exception("TotemT2Segmentation") << "Failed to retrieve list of bins for TotemT2DetId " << detid << ".";
  if (static_cast<size_t>(hist->GetXaxis()->GetNbins()) != nbinsx_ ||
      static_cast<size_t>(hist->GetYaxis()->GetNbins()) != nbinsy_)
    throw cms::Exception("TotemT2Segmentation")
        << "Trying to fill a summary plot with invalid number of bins. "
        << "Should be of dimension (" << nbinsx_ << ", " << nbinsy_ << "), but has dimension ("
        << hist->GetXaxis()->GetNbins() << ", " << hist->GetYaxis()->GetNbins() << ").";
  for (const auto& bin : bins_map_.at(detid))
    hist->Fill(bin.first, bin.second, value);
}

Member Data Documentation

bins_map_

std::unordered_map<TotemT2DetId, std::vector<std::pair<short, short> > > TotemT2Segmentation::bins_map_

private

Definition at line 31 of file TotemT2Segmentation.h.

Referenced by fill(), and TotemT2Segmentation().

nbinsx_

const size_t TotemT2Segmentation::nbinsx_

private

Definition at line 28 of file TotemT2Segmentation.h.

Referenced by computeBins(), and fill().

nbinsy_

const size_t TotemT2Segmentation::nbinsy_

private

Definition at line 29 of file TotemT2Segmentation.h.

Referenced by computeBins(), and fill().