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#include "CalibTracker/SiStripAPVAnalysis/interface/SimplePedestalCalculator.h"
#include <cmath>
#include <numeric>
#include <algorithm>
using namespace std;
SimplePedestalCalculator::SimplePedestalCalculator(int evnt_ini) : numberOfEvents(0), alreadyUsedEvent(false) {
if (false)
cout << "Constructing SimplePedestalCalculator " << endl;
eventsRequiredToCalibrate = evnt_ini;
// eventsRequiredToUpdate = evnt_iter;
// cutToAvoidSignal = sig_cut;
init();
}
//
// Initialization.
//
void SimplePedestalCalculator::init() {
theRawNoise.clear();
thePedestal.clear();
thePedSum.clear();
thePedSqSum.clear();
theEventPerStrip.clear();
theStatus.setCalibrating();
}
//
// -- Destructor
//
SimplePedestalCalculator::~SimplePedestalCalculator() {
if (false)
cout << "Destructing SimplePedestalCalculator " << endl;
}
//
// -- Set Pedestal Update Status
//
void SimplePedestalCalculator::updateStatus() {
if (theStatus.isCalibrating() && numberOfEvents >= eventsRequiredToCalibrate) {
theStatus.setUpdating();
}
}
//
// -- Initialize or Update (when needed) Pedestal Values
//
void SimplePedestalCalculator::updatePedestal(ApvAnalysis::RawSignalType& in) {
if (alreadyUsedEvent == false) {
alreadyUsedEvent = true;
numberOfEvents++;
if (theStatus.isCalibrating()) {
initializePedestal(in);
} else if (theStatus.isUpdating()) {
refinePedestal(in);
}
updateStatus();
}
}
//
// -- Initialize Pedestal Values using a set of events (eventsRequiredToCalibrate)
//
void SimplePedestalCalculator::initializePedestal(ApvAnalysis::RawSignalType& in) {
if (numberOfEvents == 1) {
thePedSum.clear();
thePedSqSum.clear();
theEventPerStrip.clear();
thePedSum.reserve(128);
thePedSqSum.reserve(128);
theEventPerStrip.reserve(128);
thePedSum.resize(in.data.size(), 0);
thePedSqSum.resize(in.data.size(), 0);
theEventPerStrip.resize(in.data.size(), 0);
}
//eventsRequiredToCalibrate is considered the minimum number of events to be used
if (numberOfEvents <= eventsRequiredToCalibrate) {
edm::DetSet<SiStripRawDigi>::const_iterator i = in.data.begin();
int ii = 0;
for (; i != in.data.end(); i++) {
thePedSum[ii] += (*i).adc();
thePedSqSum[ii] += ((*i).adc()) * ((*i).adc());
theEventPerStrip[ii]++;
ii++;
}
}
if (numberOfEvents == eventsRequiredToCalibrate) {
thePedestal.clear();
theRawNoise.clear();
edm::DetSet<SiStripRawDigi>::const_iterator i = in.data.begin();
int ii = 0;
for (; i != in.data.end(); i++) {
// the pedestal is calculated as int, as required by FED.
int avVal = (theEventPerStrip[ii]) ? thePedSum[ii] / theEventPerStrip[ii] : 0;
double sqAvVal = (theEventPerStrip[ii]) ? thePedSqSum[ii] / theEventPerStrip[ii] : 0.0;
double corr_fac = (theEventPerStrip[ii] > 1) ? (theEventPerStrip[ii] / (theEventPerStrip[ii] - 1)) : 1.0;
double rmsVal = (sqAvVal - avVal * avVal > 0.0) ? sqrt(corr_fac * (sqAvVal - avVal * avVal)) : 0.0;
thePedestal.push_back(static_cast<float>(avVal));
theRawNoise.push_back(static_cast<float>(rmsVal));
ii++;
}
}
}
//
// -- Update Pedestal Values when needed.
//
void SimplePedestalCalculator::refinePedestal(ApvAnalysis::RawSignalType& in) {
// keep adding th adc count for any events
unsigned int ii = 0;
ApvAnalysis::RawSignalType::const_iterator i = in.data.begin();
for (; i < in.data.end(); i++) {
thePedSum[ii] += (*i).adc();
thePedSqSum[ii] += ((*i).adc()) * ((*i).adc());
theEventPerStrip[ii]++;
ii++;
}
// calculate a new pedestal any events, so it will come for free when for the last event
for (unsigned int iii = 0; iii < in.data.size(); iii++) {
if (theEventPerStrip[iii] > 10) {
int avVal = (theEventPerStrip[iii]) ? thePedSum[iii] / theEventPerStrip[iii] : 0;
double sqAvVal = (theEventPerStrip[iii]) ? thePedSqSum[iii] / theEventPerStrip[iii] : 0.0;
double rmsVal = (sqAvVal - avVal * avVal > 0.0) ? sqrt(sqAvVal - avVal * avVal) : 0.0;
if (avVal != 0) {
thePedestal[iii] = static_cast<float>(avVal);
theRawNoise[iii] = static_cast<float>(rmsVal);
}
}
}
}
//
// Define New Event
//
void SimplePedestalCalculator::newEvent() { alreadyUsedEvent = false; }
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