Fitting problems when assining parameters to different bins

[Wouter_Blokland]

Hi

I’m using my own functions(tf1) to fit my data. I do this for a mass distribution divide in bins. My distribution array looks as follows: massDistBin[ptbin][etabin][cut][whichcut]… the dimensions are [8][5][2][2]…the filling of these distributions with my mass data works, but when I try to fit my functions to it via a loop going of the bins (pt and eta) and the cuts(cut of uncut, id or iso) I get some problems… I try to adjust the parameters of some specific bins via if statements, but when I adjust the parameters for some of these I also see adjustments to other bins combinations … can someone explain how this is possible? a part of my code can be found at the end (as example it try to adjust the parameters for the uncut distribution in the case of ID). I already divided the code into different parts for uncut and cut and id and iso in the hope that this would solve my problem but it doesn’t.

for(int ptbins=0; ptbins<NumberOfptbins;ptbins++){
			for(int etabins=0;etabins<NumberOfetabins;etabins++){
				function.SetParameters(1200,-100,0.02,200000000,91,1,88,5);
				if(ptbins == 7 and etabins == 2){
					function.SetParameters(120,-100,0.02,2000000000,91,3,90,7);
					cout << PT[ptbins] << ETA[etabins] << "\n";
				}else{
					if( ptbins == 7 and etabins == 0){
						function.SetParameters(1200,-100,-0.02,200000000,91,1,88,5);
						cout << PT[ptbins] << ETA[etabins] << "\n";
					}else{
						if( ptbins == 6 and etabins == 2){
							function.SetParameters(1200,-100,-0.02,200000000,91,1,88,5);
							cout << PT[ptbins] << ETA[etabins] << "\n";						
						}else{
							if( ptbins == 0 and etabins == 4){
								function.SetParameters(60,-10,0.04,-1200000,116,-2,84,7);
								cout << PT[ptbins] << ETA[etabins] << "\n";
							}else{
								if( ptbins == 2 and etabins == 4){
									function.SetParameters(1200,-100,0.02,200000000,91,1,88,5);
									cout << PT[ptbins] << ETA[etabins] << "\n";
								}else{
									if( ptbins == 7 and etabins == 4){ 
										function.SetParameters(1200,-100,0.02,2000000000,91,1,88,5);
										cout << PT[ptbins] << ETA[etabins] << "\n";
									}else{
										if( ptbins == 7 and etabins == 3){ 
											function.SetParameters(1200,-100,0.02,2000000000,91,1,88,5);
											cout << PT[ptbins] << ETA[etabins] << "\n";
										}else{
											function.SetParameters(1200,-100,0.02,200000000,91,1,88,5);
										}
									}										
								}
							}
						}
					}
				}						
				function.SetParNames("b", "c", "d", "a", "Mean","Gamma","Mean Gauss", "Sigma");
				massDistBins[ptbins][etabins][Uncut][ID]->Fit(&function,"S");
				massDistBins[ptbins][etabins][Uncut][ID]->Fit(&function,"S");
				for(int par=0;par<nFitPar;par++){	
					massDistFit_Total[ptbins][etabins][Uncut][ID]->SetParameter(par, function.GetParameter(par));
					if(par<3) massDistFit_Background[ptbins][etabins][Uncut][ID]->SetParameter(par,function.GetParameter(par));
					else massDistFit_Signal[ptbins][etabins][Uncut][ID]->SetParameter(par-3,function.GetParameter(par));
				}
			}
		}

Kind regards

Wouter

[Pepe_Le_Pew]

“and” should be replaced with “&&” (well, at least for CINT).