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////////////////////////////////////////////////////////////////////////////////
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//
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// jetcorr
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// -------
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//
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// 07/05/2007 Philipp Schieferdecker <philipp.schieferdecker@cern.ch>
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////////////////////////////////////////////////////////////////////////////////
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#include "jetcorr.h"
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#include <TF1.h>
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#include <iostream>
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#include <fstream>
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#include <sstream>
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#include <algorithm>
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#include <cmath>
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using namespace std;
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double fnc_official(double*x,double*p);
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////////////////////////////////////////////////////////////////////////////////
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// construction/destruction
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////////////////////////////////////////////////////////////////////////////////
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//______________________________________________________________________________
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jetcorr::jetcorr()
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{
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}
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//______________________________________________________________________________
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jetcorr::~jetcorr()
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{
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clear();
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}
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////////////////////////////////////////////////////////////////////////////////
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// implementation of member functions
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////////////////////////////////////////////////////////////////////////////////
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//______________________________________________________________________________
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float jetcorr::eval(float pt,float eta)
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{
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MapCIter_t it = fitfncs_.lower_bound(eta);
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assert(it!=fitfncs_.end());
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double rsp = it->second->Eval(pt);
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double jes = (rsp>0.0) ? 1./rsp : 1.0;
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return jes;
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}
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//______________________________________________________________________________
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bool jetcorr::initialize(const string& filename)
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{
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clear();
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ifstream fin(filename.c_str());
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if (!fin.is_open()) {
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cout<<"can't open "<<filename<<endl;
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return false;
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}
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stringstream ss;
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bool filter(false);
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while (!fin.eof()) {
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char next;
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fin.get(next);
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if (!filter&&next=='#') filter=true;
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if(!filter) ss<<next;
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if (filter&&next=='\n') filter=false;
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}
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fin.close();
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int netabins;
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string fitfncAsString;
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int fitfncNbParams;
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float eta,par;
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ss>>netabins>>fitfncAsString>>fitfncNbParams;
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for (int ieta=0;ieta<netabins;ieta++) {
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ss>>eta;
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stringstream fname; fname<<"fitfnc_eta"<<eta;
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TF1* fitfnc = (fitfncAsString=="official") ?
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new TF1(fname.str().c_str(),fnc_official,1,1e4,9) :
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new TF1(fname.str().c_str(),fitfncAsString.c_str());
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fitfncs_[eta] = fitfnc;
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for (int ipar=0;ipar<fitfncNbParams;ipar++) {
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ss>>par;
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fitfnc->SetParameter(ipar,par);
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}
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}
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return true;
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}
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//______________________________________________________________________________
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void jetcorr::clear()
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{
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for (MapIter_t it=fitfncs_.begin();it!=fitfncs_.end();++it) delete it->second;
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fitfncs_.clear();
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}
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//______________________________________________________________________________
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double fnc_official(double*xx,double*p)
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{
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double a2 = p[5]/(std::sqrt(std::abs(p[6]*p[1] + p[7]))) + p[8];
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double a1 = p[2]*std::sqrt(p[0] +p[3]) + p[4];
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double w1 = (a1*p[1] - a2*p[0])/(p[1]-p[0]);
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double w2 = (a2-a1)/(p[1]-p[0]);
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double koef = 1.;
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double e = xx[0];
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double JetCalibrEt = e;
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double x =e;
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double etConstantResponse=5.;
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if ( e<etConstantResponse ) JetCalibrEt=etConstantResponse;
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for (int ie=0; ie<10; ie++) { //10 iterations garantees convergence
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if ( JetCalibrEt<etConstantResponse ) JetCalibrEt=etConstantResponse;
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if (JetCalibrEt < p[0]) {
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koef = p[2]*std::sqrt(std::abs(JetCalibrEt +p[3])) + p[4];
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}
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else if (JetCalibrEt < p[1]) {
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koef = w1 + JetCalibrEt*w2;
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}
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else if (JetCalibrEt > p[1]) {
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koef = p[5]/(std::sqrt(std::abs(p[6]*JetCalibrEt + p[7]))) + p[8];
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}
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if(koef<0.1) koef=0.1;
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JetCalibrEt = x / koef;
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}
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return koef;
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}
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