/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/OnlineDB/EcalCondDB/src/EcalCommon.cc

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#include <math.h>
#include <stdexcept>

#include "OnlineDB/EcalCondDB/interface/EcalCommon.h"

using namespace std;

int EcalCommon::crystalToTriggerTower(int xtal)
  throw(std::runtime_error)
{
  if (xtal < 1 || xtal > 1700) {
    throw(std::runtime_error("ERROR:  crystalToTriggerTower:  crystal number out of bounds"));
  }
  
  int i   = (int) floor((xtal-1)/20.0);
  int j   = (xtal-1) - 20*i;
  int tti = (int) floor(i/5.0);
  int ttj = (int) floor(j/5.0);
  int tt  = ttj + 4*tti + 1;

  return tt;
}