No histogram show up

ROOT
1

Hi,

I wrote a simple macro that loads histograms from file and divides them. I’d like to show the resulting histo in a canvas, but there is no way to do it. It only can be printed on file. Is there a reason for it? What am I missing?

Thanks a lot

Sara
patTau_test.C (1.27 KB)

2

I see you are drawing the histogram using the option P so you should see it drawn with points.
Simply do Draw() without option to see it better.

PS: I cannot run you macro because the data file is missing.

3

Hi,

I’ve tried to remove the “p” option but no histogram is shown again…
I’m attaching the root file to run the macro.
Thanks!
Sara
patTau_Histograms_100GeV_scaled_gen.root (16.7 KB)

4

Hi,

The histograms are owned by the file, and are deleted when the file is closed. Adding:

TH1::AddDirectory(kFALSE); in your function should solve the problem.

Cheers, Bertrand.

5

Thanks! it works, indeed!

Sara :slight_smile: