| 1 | /* ======================================================================== *\
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| 2 | !
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| 3 | ! *
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| 4 | ! * This file is part of MARS, the MAGIC Analysis and Reconstruction
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| 5 | ! * Software. It is distributed to you in the hope that it can be a useful
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| 6 | ! * and timesaving tool in analysing Data of imaging Cerenkov telescopes.
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| 7 | ! * It is distributed WITHOUT ANY WARRANTY.
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| 8 | ! *
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| 9 | ! * Permission to use, copy, modify and distribute this software and its
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| 10 | ! * documentation for any purpose is hereby granted without fee,
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| 11 | ! * provided that the above copyright notice appear in all copies and
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| 12 | ! * that both that copyright notice and this permission notice appear
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| 13 | ! * in supporting documentation. It is provided "as is" without express
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| 14 | ! * or implied warranty.
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| 15 | ! *
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| 16 | !
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| 17 | !
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| 18 | ! Author(s): Antonio Stamerra 02/2003 <mailto:antonio.stamerra@pi.infn.it>
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| 19 | !
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| 20 | ! Copyright: MAGIC Software Development, 2000-2003
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| 21 | !
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| 22 | !
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| 23 | \* ======================================================================== */
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| 24 |
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| 25 | /////////////////////////////////////////////////////////////////////////////
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| 26 | // //
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| 27 | // MFEnergySlope //
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| 28 | // //
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| 29 | // A filter to select MC events (generated with a energy slope MCSlope) //
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| 30 | // with a different energy slope NewSlope set by the user. //
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| 31 | // //
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| 32 | // The new slope is set by the user with SetSlope(). //
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| 33 | // Only negative slopes are admitted; positive ones are internally //
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| 34 | // converted. //
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| 35 | // Events are selected following the new energy power slope, and the //
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| 36 | // sample is normalized to the number of events at: //
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| 37 | // 1. McMaxEnergy, if abs(NewSlope) < abs(McSlope); //
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| 38 | // 2. McMinEnergy, if abs(NewSlope) > abs(McSlope); //
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| 39 | // Mc{Max,Min}Energy are set with SetMcMinEnergy() and SetMcMaxEnergy(); //
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| 40 | // with GeV values. //
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| 41 | // Default values are the min/max energy of the MC sample. //
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| 42 | // //
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| 43 | // With this filter the statistics of the MC sample is reduced. //
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| 44 | // camera ver.0.6 and reflector ver.0.6 are required to fetch //
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| 45 | // the correct MC information //
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| 46 | // //
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| 47 | /////////////////////////////////////////////////////////////////////////////
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| 48 | #include "MFEnergySlope.h"
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| 49 |
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| 50 | #include <fstream>
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| 51 | #include <TRandom.h>
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| 52 |
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| 53 | #include "MParList.h"
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| 54 |
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| 55 | #include "MLog.h"
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| 56 | #include "MLogManip.h"
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| 57 |
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| 58 | #include "MMcEvt.hxx"
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| 59 | #include "MMcCorsikaRunHeader.h"
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| 60 |
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| 61 | ClassImp(MFEnergySlope);
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| 62 |
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| 63 | using namespace std;
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| 64 |
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| 65 | // --------------------------------------------------------------------------
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| 66 | //
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| 67 | // Constructor
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| 68 | //
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| 69 | MFEnergySlope::MFEnergySlope(const char *name, const char *title):
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| 70 | fNumSelectedEvts(0), fNewSlope(-1), fMcMinEnergy(-1.), fMcMaxEnergy(-1.)
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| 71 | {
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| 72 | // fContName = cname;
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| 73 | fName = name ? name : "MFEnergySlope";
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| 74 | fTitle = title ? title : "Filter to select energy with given slope";
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| 75 | }
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| 76 |
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| 77 | // --------------------------------------------------------------------------
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| 78 | //
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| 79 | // Preprocess
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| 80 | //
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| 81 | // MC slope and min/max energy are read
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| 82 | // Normalization factor is computed
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| 83 | //
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| 84 | Bool_t MFEnergySlope::PreProcess(MParList *pList)
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| 85 | {
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| 86 |
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| 87 | MMcCorsikaRunHeader *runheader = (MMcCorsikaRunHeader*)pList->FindObject("MMcCorsikaRunHeader");
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| 88 |
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| 89 | if (!runheader)
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| 90 | {
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| 91 | *fLog << err << dbginf << fName << " [MMcCorsikaRunHeader] not found... aborting." << endl;
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| 92 | return kFALSE;
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| 93 | }
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| 94 | //
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| 95 | // Read info from the MC sample (it must be generated with
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| 96 | // reflector ver.0.6 and camera ver. 0.6)
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| 97 | //
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| 98 | fMcSlope = runheader->GetSlopeSpec();
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| 99 | if (fMcMinEnergy<0)
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| 100 | fMcMinEnergy = runheader->GetELowLim();
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| 101 | if (fMcMinEnergy<0)
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| 102 | fMcMaxEnergy = runheader->GetEUppLim();
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| 103 |
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| 104 | *fLog << inf;
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| 105 | *fLog << "MFEnergySlope::PreProcess: fetched MC info:" << endl;
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| 106 | *fLog << " E Slope: " << fMcSlope << endl;
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| 107 | *fLog << " E Min: " << fMcMinEnergy << endl;
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| 108 | *fLog << " E Max: " << fMcMaxEnergy << endl;
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| 109 | *fLog << " New E Slope: " << fNewSlope << endl;
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| 110 |
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| 111 | // Slope is used with positive values in the code
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| 112 | if (fNewSlope < 0)
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| 113 | fNewSlope *= -1;
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| 114 | if (fMcSlope < 0)
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| 115 | fMcSlope *= -1;
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| 116 |
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| 117 |
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| 118 | // Set normalization on energy
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| 119 | fN0 = pow(fNewSlope>fMcSlope?fMcMinEnergy:fMcMaxEnergy,fNewSlope-fMcSlope);
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| 120 |
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| 121 | *fLog << "Normalization factor:" <<fN0 << endl;
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| 122 |
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| 123 | //---
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| 124 | fEvt = (MMcEvt*)pList->FindObject("MMcEvt");
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| 125 | if (!fEvt)
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| 126 | {
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| 127 | *fLog << err << dbginf << fName << " [MMcEvt] not found... aborting." << endl;
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| 128 | return kFALSE;
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| 129 | }
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| 130 |
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| 131 | return kTRUE;
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| 132 | }
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| 133 |
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| 134 | // --------------------------------------------------------------------------
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| 135 | //
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| 136 | // Select events randomly according to the MC ("old") and required ("new")
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| 137 | // energy slope.
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| 138 | // Old E slope is fMcSlope
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| 139 | // New E slope is set by the user (fval; fNewSlope)
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| 140 | // If old and new energy slope are the same skip the selection.
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| 141 | // The MC energy slope and lower and upper limits are taken from the
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| 142 | // run header (requires reflector ver.>0.6 and camera ver.>0.6)
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| 143 | //
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| 144 | Bool_t MFEnergySlope::Process()
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| 145 | {
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| 146 | fResult = kTRUE;
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| 147 |
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| 148 | // Energy slopes are the same: skip it
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| 149 | if (fNewSlope == fMcSlope)
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| 150 | return kTRUE;
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| 151 |
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| 152 | // The value of the normalized spectrum is compared with a
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| 153 | // random value in [0,1];
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| 154 | // if the latter is higher the event is accepted
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| 155 | const Float_t energy = fEvt->GetEnergy();
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| 156 |
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| 157 | /*
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| 158 | //
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| 159 | // If energy bounds different from MC ones are selected, then
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| 160 | // events outside these bounds are rejected, as their slope has
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| 161 | // not been changed.
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| 162 | //
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| 163 | if (energy > fMcMaxEnergy || energy < fMcMinEnergy)
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| 164 | {
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| 165 | fResult = kFALSE;
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| 166 | return kTRUE;
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| 167 | }
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| 168 | */
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| 169 |
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| 170 | const Float_t Nexp = fN0 * pow(energy,fMcSlope-fNewSlope);
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| 171 | const Float_t Nrnd = gRandom->Uniform();
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| 172 |
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| 173 | fResult = Nexp > Nrnd;
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| 174 |
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| 175 | if (!fResult)
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| 176 | return kTRUE;
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| 177 |
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| 178 | fNumSelectedEvts++;
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| 179 | return kTRUE;
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| 180 | }
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| 181 |
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