Special variables in TTree::Draw


could somebody point me to the/a documentation about the special variables of TTree::Draw (like Entry$, Entries$ etc)?

I was wondering whether there is one corresponding to the index of array branches. So e.g. if I have signal amplitudes of strips of a detector stored as amp[#strip], that I could draw the line shape with


if ArrayIdx$ would be the running index of the array entries.

Best regards and thanks,


Hi, thanks!

I already found that but had the hope it could be incomplete. But it looks like there is no variable for the current array index of an array branch…

How about “Iteration$”?

Oops, you are right! I misunderstood the meaning of Iteration$ in the description…
Thanks again! :slight_smile:

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