Histogram with errorbar

ROOT
1

Hi all,

I would like to make a histogram together with the errorbar, but I am stuck at this point.
Here is my code:

FILE *fp=fopen("data.dat","r+");
TH1F *hist_1 = new TH1F("histogram","osszefonodas eloszlas - 2qubit",100,0,1);
hist_1->Sumw2();
Double_t j=0.0;
while((fscanf(fp,"%lf",&j)!=EOF)){printf("the value read is %lf\n",j);hist_1->Fill(j);hist_1->Draw();}

This should work, but I get only errorbar and the histogram is gone.
Please, help!

Cheers,
bgy

2

Try:

hist_1->Draw(“H”);

or

hist_1->Draw(“EH”)

3

Thanks, hist_1->Draw(“EH”) works fine.