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#include "CondFormats/JetMETObjects/interface/SimpleJetCorrector.h"
#include "CondFormats/JetMETObjects/interface/JetCorrectorParameters.h"
#include "CondFormats/JetMETObjects/interface/Utilities.h"
#include <iostream>
#include <sstream>
#include <cmath>
#include <algorithm>
//------------------------------------------------------------------------
//--- SimpleJetCorrector constructor -------------------------------------
//--- reads arguments from a file ----------------------------------------
//------------------------------------------------------------------------
SimpleJetCorrector::SimpleJetCorrector(const std::string& fDataFile, const std::string& fOption)
: mParameters(fDataFile, fOption), mFunc((mParameters.definitions()).formula()) {
mDoInterpolation = false;
if (mParameters.definitions().isResponse())
mInvertVar = findInvertVar();
}
//------------------------------------------------------------------------
//--- SimpleJetCorrector constructor -------------------------------------
//--- reads arguments from a file ----------------------------------------
//------------------------------------------------------------------------
SimpleJetCorrector::SimpleJetCorrector(const JetCorrectorParameters& fParameters)
: mParameters(fParameters), mFunc((mParameters.definitions()).formula()) {
mDoInterpolation = false;
if (mParameters.definitions().isResponse())
mInvertVar = findInvertVar();
}
//------------------------------------------------------------------------
//--- calculates the correction ------------------------------------------
//------------------------------------------------------------------------
float SimpleJetCorrector::correction(const std::vector<float>& fX, const std::vector<float>& fY) const {
float result = 1.;
float tmp = 0.0;
float cor = 0.0;
int bin = -1;
bin = (fX.size() <= 3 && !fX.empty()) ? mParameters.binIndexN(fX) : mParameters.binIndex(fX);
if (bin < 0)
return result;
if (!mDoInterpolation)
result = correctionBin(bin, fY);
else {
for (unsigned i = 0; i < mParameters.definitions().nBinVar(); i++) {
float xMiddle[3];
float xValue[3];
int prevBin = mParameters.neighbourBin((unsigned)bin, i, false);
int nextBin = mParameters.neighbourBin((unsigned)bin, i, true);
if (prevBin >= 0 && nextBin >= 0) {
xMiddle[0] = mParameters.record(prevBin).xMiddle(i);
xMiddle[1] = mParameters.record(bin).xMiddle(i);
xMiddle[2] = mParameters.record(nextBin).xMiddle(i);
xValue[0] = correctionBin(prevBin, fY);
xValue[1] = correctionBin(bin, fY);
xValue[2] = correctionBin(nextBin, fY);
cor = quadraticInterpolation(fX[i], xMiddle, xValue);
tmp += cor;
} else {
cor = correctionBin(bin, fY);
tmp += cor;
}
}
result = tmp / mParameters.definitions().nBinVar();
}
if (result <= 0) {
edm::LogWarning("SimpleJetCorrector")
<< "Null or negative jet energy correction factor evaluated: " << result << ". Truncating to 10e-10.";
result = 10e-10;
}
return result;
}
//------------------------------------------------------------------------
//--- calculates the correction for a specific bin -----------------------
//------------------------------------------------------------------------
float SimpleJetCorrector::correctionBin(unsigned fBin, const std::vector<float>& fY) const {
if (fBin >= mParameters.size()) {
std::stringstream sserr;
sserr << "wrong bin: " << fBin << ": only " << mParameters.size() << " available!";
handleError("SimpleJetCorrector", sserr.str());
}
unsigned N = fY.size();
if (!fY.empty() && N <= 4) {
const std::vector<float>& par = mParameters.record(fBin).parameters();
auto nParams = static_cast<int>(par.size() - 2 * N);
if (nParams > 0) {
double params[nParams];
for (unsigned int i = 2 * N; i < par.size(); i++) {
params[i - 2 * N] = par[i];
}
double x[4] = {};
for (unsigned i = 0; i < N; i++) {
x[i] = (fY[i] < par[2 * i]) ? par[2 * i] : (fY[i] > par[2 * i + 1]) ? par[2 * i + 1] : fY[i];
}
if (mParameters.definitions().isResponse()) {
return invert(x, params);
}
return mFunc.evaluate(reco::formula::ArrayAdaptor(x, N), reco::formula::ArrayAdaptor(params, par.size() - 2 * N));
} else {
return 1.0;
}
} else {
edm::LogWarning("SimpleJetCorrector") << "Expect number of variables to be 0<N<=4 but is " << N << "in bin " << fBin
<< ". Returning zero" << std::endl;
return 0.0;
}
}
//------------------------------------------------------------------------
//--- find invertion variable (JetPt) ------------------------------------
//------------------------------------------------------------------------
unsigned SimpleJetCorrector::findInvertVar() {
unsigned result = 9999;
std::vector<std::string> vv = mParameters.definitions().parVar();
for (unsigned i = 0; i < vv.size(); i++)
if (vv[i] == "JetPt") {
result = i;
break;
}
if (result >= vv.size())
handleError("SimpleJetCorrector", "Response inversion is required but JetPt is not specified as parameter");
return result;
}
//------------------------------------------------------------------------
//--- inversion ----------------------------------------------------------
//------------------------------------------------------------------------
float SimpleJetCorrector::invert(const double* args, const double* params) const {
unsigned nMax = 50;
float precision = 0.0001;
float rsp = 1.0;
float e = 1.0;
double x[4];
unsigned nLoop = 0;
// 4 dimensions (x, y, z, t) supported in TFormula
memcpy(&x, args, sizeof(double) * 4);
while (e > precision && nLoop < nMax) {
rsp = mFunc.evaluate(reco::formula::ArrayAdaptor(x, 4),
reco::formula::ArrayAdaptor(params, mFunc.numberOfParameters()));
float tmp = x[mInvertVar] * rsp;
e = fabs(tmp - args[mInvertVar]) / args[mInvertVar];
x[mInvertVar] = args[mInvertVar] / rsp;
nLoop++;
}
return 1. / rsp;
}
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