How to write a cut files for Drawing a variable with C++ macro?

ROOT
1

Hello,

I am trying to draw a on-the-fly variable by using a macro, so far i am able to do so by

tree->Draw(“conplexVar.C”)

i would like to draw the variable with selection but i need a cut files as the error suggest:

tree->Draw(“complextVar.C”,“mll>20”)

Error in TTreePlayer::DrawSelect: Drawing using a C++ file currently requires that both the expression and the selection are files

How do i write an expression and the selection in root macro? Thanks

ROOT Version: 6.18/04
Platform: Ubuntu 18.04 LTS
Compiler: gcc 7.4.0

2

@pcanal can give more details, but you can use MakeSelector for that.

3

At the moment, I don’t see us being able to add this feature. Instead you might want to see if you can use RDataFrame.

Cheers,
Philippe.