/* More explanations at the end of the file */
void optimdisp()
{
    MJOptimizeDisp opt;                     // Initialize optimization class
    opt.SetDebug(2);                        // Choose the level of output
    opt.SetOptimizer(MJOptimize::kMigrad);  // Choose the fit algorithm (see MJOptimize)
    opt.EnableTestTrain();                  // Split sample into test and train

    // -------------------- Setup ----------------------------
    opt.AddParameter("1-(MHillas.fWidth/MHillas.fLength)"); // M[0]
    opt.AddParameter("log10(MNewImagePar.fLeakage1+1)");    // M[1]

    opt.SetParameter(0,  1.30871);                          // Setup [0]
    opt.SetParameter(1,  5.81119);                          // Setup [1]
    opt.SetParameter(2,  0.763486);                         // Setup [2]

    char *r = "([0]+([1]*pow(M[1], [2])))*M[0]";            // Rule to calc Disp

    // -------------------- Run ----------------------------

    MStatusDisplay *d = new MStatusDisplay;
    opt.SetDisplay(d);

    /*
     -------------------- Magic-Cuts ----------------------
     MFMagicCuts cuts;
     cuts.SetHadronnessCut(MFMagicCuts::kArea);
     cuts.SetThetaCut(MFMagicCuts::kOn);

     TArrayD arr(10);
     arr[0]=  1.3245;
     arr[1]=  0.208700;
     arr[2]=  0.229200;
     arr[3]=  5.305200;
     arr[4]=  0.098930;
     arr[5]= -0.082950;
     arr[6]=  8.2957;
     arr[7]=  0.8677;

     cuts.SetVariables(arr);

     opt.AddPreCut(&cuts);

     -------------------- Energy Slope --------------------
     MFEnergySlope slope(-2.8);
     opt.AddPreCut(&slope);

     -------------------- Other cuts ----------------------
     opt.AddPreCut("MNewImagePar.fLeakage1<0.0001");
    */

    opt.RunDisp("ganymedmcpart.root", r);
}

/* ------------------ Good strategy -------------------
 1) first fix parameters:
      opt.FixParameter(1,  0);
      opt.FixParameter(2,  1);
    and process only showers without leakage
      opt.AddPreCut("MNewImagePar.fLeakage1<0.0001");
 2) release parameters 1 and 2 and fix 0 to the result of 1)
      opt.FixParameter(0,  0.8362);
      opt.SetParameter(1,  2.0);
      opt.SetParameter(2,  0.8);
    and process only showers with leakage
      opt.AddPreCut("MNewImagePar.fLeakage1>0.0001");
 3) release all parameters and start with the result of 1) and 2)
      opt.SetParameter(0,  0.8362);
      opt.SetParameter(1,  5.84);
      opt.SetParameter(2,  0.76);
    and process all showers. (Comment out opt.PreCuts())
 */