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#include "CondFormats/SiStripObjects/interface/SiStripApvSimulationParameters.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "CLHEP/Random/RandFlat.h"
namespace {
PhysicsTools::Calibration::HistogramF2D calculateXInt(const SiStripApvSimulationParameters::LayerParameters& params) {
auto hXInt = (params.hasEquidistantBinsY()
? (params.hasEquidistantBinsZ()
? PhysicsTools::Calibration::HistogramF2D(
params.numberOfBinsY(), params.rangeY(), params.numberOfBinsZ(), params.rangeZ())
: PhysicsTools::Calibration::HistogramF2D(
params.numberOfBinsY(), params.rangeY(), params.upperLimitsZ()))
: (params.hasEquidistantBinsZ()
? PhysicsTools::Calibration::HistogramF2D(
params.upperLimitsY(), params.numberOfBinsZ(), params.rangeZ())
: PhysicsTools::Calibration::HistogramF2D(params.upperLimitsY(), params.upperLimitsZ())));
for (int i{0}; i != params.numberOfBinsY() + 2; ++i) {
for (int j{0}; j != params.numberOfBinsZ() + 2; ++j) {
float xInt = 0.;
for (int k{0}; k != params.numberOfBinsX() + 2; ++k) {
xInt += params.binContent(k, i, j);
}
hXInt.setBinContent(i, j, xInt);
}
}
return hXInt;
}
float xBinPos(const SiStripApvSimulationParameters::LayerParameters& hist, int iBin, float pos = 0.5) {
// NOTE: does not work for under- and overflow bins (iBin = 0 and iBIn == hist.numberOfBinsX()+1)
if (hist.hasEquidistantBinsX()) {
const auto range = hist.rangeX();
const auto binWidth = (range.max - range.min) / hist.numberOfBinsX();
return range.min + (iBin - 1 + pos) * binWidth;
} else {
return (1. - pos) * hist.upperLimitsX()[iBin - 1] + pos * hist.upperLimitsX()[iBin];
}
}
} // namespace
void SiStripApvSimulationParameters::calculateIntegrals() {
if (m_barrelParam.size() != m_barrelParam_xInt.size()) {
m_barrelParam_xInt.resize(m_barrelParam.size());
for (unsigned int i{0}; i != m_barrelParam.size(); ++i) {
m_barrelParam_xInt[i] = calculateXInt(m_barrelParam[i]);
}
}
if (m_endcapParam.size() != m_endcapParam_xInt.size()) {
m_endcapParam_xInt.resize(m_endcapParam.size());
for (unsigned int i{0}; i != m_endcapParam.size(); ++i) {
m_endcapParam_xInt[i] = calculateXInt(m_endcapParam[i]);
}
}
}
bool SiStripApvSimulationParameters::putTIB(SiStripApvSimulationParameters::layerid layer,
SiStripApvSimulationParameters::LayerParameters&& params) {
if ((layer > m_nTIB) || (layer < 1)) {
edm::LogError("SiStripApvSimulationParameters")
<< "[" << __PRETTY_FUNCTION__ << "] layer index " << layer << " out of range [1," << m_nTIB << "]";
return false;
}
m_barrelParam[layer - 1] = params;
m_barrelParam_xInt[layer - 1] = calculateXInt(params);
return true;
}
bool SiStripApvSimulationParameters::putTOB(SiStripApvSimulationParameters::layerid layer,
SiStripApvSimulationParameters::LayerParameters&& params) {
if ((layer > m_nTOB) || (layer < 1)) {
edm::LogError("SiStripApvSimulationParameters")
<< "[" << __PRETTY_FUNCTION__ << "] layer index " << layer << " out of range [1," << m_nTOB << ")";
return false;
}
m_barrelParam[m_nTIB + layer - 1] = params;
m_barrelParam_xInt[m_nTIB + layer - 1] = calculateXInt(params);
return true;
}
bool SiStripApvSimulationParameters::putTID(SiStripApvSimulationParameters::layerid wheel,
SiStripApvSimulationParameters::LayerParameters&& params) {
if ((wheel > m_nTID) || (wheel < 1)) {
edm::LogError("SiStripApvSimulationParameters")
<< "[" << __PRETTY_FUNCTION__ << "] wheel index " << wheel << " out of range [1," << m_nTID << "]";
return false;
}
m_endcapParam[wheel - 1] = params;
m_endcapParam_xInt[wheel - 1] = calculateXInt(params);
return true;
}
bool SiStripApvSimulationParameters::putTEC(SiStripApvSimulationParameters::layerid wheel,
SiStripApvSimulationParameters::LayerParameters&& params) {
if ((wheel > m_nTEC) || (wheel < 1)) {
edm::LogError("SiStripApvSimulationParameters")
<< "[" << __PRETTY_FUNCTION__ << "] wheel index " << wheel << " out of range [1," << m_nTEC << ")";
return false;
}
m_endcapParam[m_nTID + wheel - 1] = params;
m_endcapParam_xInt[m_nTID + wheel - 1] = calculateXInt(params);
return true;
}
float SiStripApvSimulationParameters::sampleBarrel(layerid layerIdx,
float z,
float pu,
CLHEP::HepRandomEngine* engine) const {
if (m_barrelParam.size() != m_barrelParam_xInt.size()) {
throw cms::Exception("LogicError") << "x-integrals of 3D histograms have not been calculated";
}
const auto layerParam = m_barrelParam[layerIdx];
const int ip = layerParam.findBinY(pu);
const int iz = layerParam.findBinZ(z);
const float norm = m_barrelParam_xInt[layerIdx].binContent(ip, iz);
const auto val = CLHEP::RandFlat::shoot(engine) * norm;
if (val < layerParam.binContent(0, ip, iz)) { // underflow
return layerParam.rangeX().min;
} else if (norm - val < layerParam.binContent(layerParam.numberOfBinsX() + 1, ip, iz)) { // overflow
return layerParam.rangeX().max;
} else { // loop over bins, return center of our bin
float sum = layerParam.binContent(0, ip, iz);
for (int i{1}; i != layerParam.numberOfBinsX() + 1; ++i) {
sum += layerParam.binContent(i, ip, iz);
if (sum > val) {
return xBinPos(layerParam, i, (sum - val) / layerParam.binContent(i, ip, iz));
}
}
}
throw cms::Exception("LogicError") << "Problem drawing a random number from the distribution";
}
float SiStripApvSimulationParameters::sampleEndcap(layerid wheelIdx,
float r,
float pu,
CLHEP::HepRandomEngine* engine) const {
if (m_endcapParam.size() != m_endcapParam_xInt.size()) {
throw cms::Exception("LogicError") << "x-integrals of 3D histograms have not been calculated";
}
const auto layerParam = m_endcapParam[wheelIdx];
const int ip = layerParam.findBinY(pu);
const int ir = layerParam.findBinZ(r);
const float norm = m_endcapParam_xInt[wheelIdx].binContent(ip, ir);
const auto val = CLHEP::RandFlat::shoot(engine) * norm;
if (val < layerParam.binContent(0, ip, ir)) { // underflow
return layerParam.rangeX().min;
} else if (norm - val < layerParam.binContent(layerParam.numberOfBinsX() + 1, ip, ir)) { // overflow
return layerParam.rangeX().max;
} else { // loop over bins, return center of our bin
float sum = layerParam.binContent(0, ip, ir);
for (int i{1}; i != layerParam.numberOfBinsX() + 1; ++i) {
sum += layerParam.binContent(i, ip, ir);
if (sum > val) {
return xBinPos(layerParam, i, (sum - val) / layerParam.binContent(i, ip, ir));
}
}
}
throw cms::Exception("LogicError") << "Problem drawing a random number from the distribution";
}
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