Normalized a histogram with line but without error bar

[yus]

And what is norm_h1?

[Afzaal786]

T tried with
h1->Scale(1/norm);
h1->Scale(1/norm_h1);
h1->Scale(1/norm_factor);
still same error

[yus]

I don’t understand what norm_h1 is. Try

Double_t norm_factor = h1->GetEntries();
h1->Scale(1/norm_factor);

If this doesn’t work, can you show what you do from the beginning?

[Afzaal786]

Thanks it works. But there is no changing in histogram’s scale.

[Afzaal786]

[yus]

Try redrawing your histogram.

[Afzaal786]

I redraw many times, but still it’s same. Could you please elaborate how we know that our histogram is normalized to unity or not?

[yus]

If you do just what’s on your screenshot, i.e.

root [1] h1->Draw("hist");
root [2] Double_t norm_factor = h1->GetEntries();
root [3] h1->Scale(1/norm_factor);

, you will still see the non-normalized histogram. However, if you do

root [4] h1->Draw("hist");

right after, you’ll see it’s normalized.

[Afzaal786]

Thank you very much @yus i did it.
Thanks a lot.