Abnormal termination of minimization

ROOT
1

I generated data according to the distribution that i will fit in the macro, but the macro give me the same error abnormal termination of minimization.

Please help me.
mortemuone.txt (20.7 KB)
random.c (1.24 KB)
mu.c (1.11 KB)

2

Looking at your data file, I see that you have a “,” instead of "."
If you fix this problem your macro should work. I also made some fixes to your macro such that it is valid C++.
see below

Rene

[code]#include <TROOT.h>
#include <TH1F.h>
#include <TF1.h>
#include <TFile.h>
#include <TTree.h>
#include <TMath.h>
#include <Riostream.h>

Double_t life(Double_t *x, Double_t par)
{
Float_t xx = x[0];
Double_t xx1 = -xx/par[1];
Double_t xx2 = -xx/par[2];
if (xx1 > 300 || xx2 > 300) return 1e10;
Double_t f = par[0](exp(xx1)+exp(xx2));
return f;
}

void mu()
{
TF1 *f1 = new TF1(“mu”,life,0,1000,3);
f1->SetParameters(70,100,2000);
f1->SetParNames(“ampiezza”,“meanlife1”,“meanlife2”);
f1->Draw();
}

void myfit()
{
TF1 f1=(TF1)gROOT->GetFunction(“mu”);
f1->SetParameters(35,100,2200);
ifstream in;
in.open(“dati.txt”);
Double_t mlife;
TFile *f = new TFile(“mlife.root”,“RECREATE”);
TH1F *h1 = new TH1F(“h1”,“mlife distribution”,100,30,800);
while (1) {
if (!in.good()) break;
in >> mlife;
cout << mlife << endl;
h1->Fill(mlife);
}
in.close();
h1->Fit(“mu”);
Double_t Chisquare = f1->GetChisquare();
Double_t NDF = (Double_t)f1->GetNDF();
printf(“Chisquare=%g, NDF=%f\n”,Chisquare,NDF);
cout<<“Chi quadro ridotto”<<" = "<<Chisquare/NDF<<endl;
f->Write();
//f->Close();
}
[/code]

3

I’m sorry i’ve attached old data in which i don’t replaced “,” with “.”. I made the changes you have suggested but it doesn’t work, give to me the same error.

4

macro finally works!It want in fit the range over which to apply the fit.