Event selection and binning in TBrowser

[lm17n000032]

Hi ROOTers,

I am currently working with the following B3a_Analysis_149_ID.root and B3a_Analysis_0_ID.root files which contains leaves, specifically I am interested in the ‘bounce’ leaf.

First, I open the B3a_Analysis_149_ID.root file from the terminal using the command:

root [0] new TBrowser("B3a_Analysis_149_ID.root")

and I see, correctly, this distribution with 10e7 entries:

Now I want to select ONLY the event with “Vol_ID == 0” so from the starviewer:

Works. Now, I want to plot on it the same distribution coming from the B3a_Analysis_0_ID.root. How can I do this from GUI?

Best Regards.

[lm17n000032]

I resolved using the command “SAME” for every files.

How can I add the legend and modify it?

[ferhue]

Right click with the mouse in the bottom left of the canvas (in the white area OUTSIDE the graph and axes), and click on Build Legend.

[lm17n000032]

Works. Can I change the bin number afterwards?

[ferhue]

To rebin after drawing, you can click on Tools, Editor, click on a Hist, and tune the Binning.

To rebin before drawing, write in the StartViewer window e.g. “htemp(1000,0,1000)” in the box before clicking on the Draw icon.

[lm17n000032]

Thanks for your help. Work perfectly.