Graphical cut on custom-function 2D plot

ROOT
1

Hello,

I would like to make a graphical cut (TCutG) on a two-dimensional plot of two custom functions. I have written two custom functions func1() and func2(), which do some processing on the leaves of a TTree. I can use them as follows:

tree->Draw("func1.cpp"); tree->Draw("func2.cpp");
However, this command

tree->Draw("func1.cpp:func2.cpp");fails with

Likewise, creating the TCutG from scratch doesn’t help:

root [6] TCutG *cutg = new TCutG("mycutg", 5) root [7] cutg->SetVarX("func1.cpp") root [8] cutg->SetVarY("func2.cpp") root [9] /* All the cutg->SetPoint() commands go here */ root [10] tree->Draw("x","mycutg") Error in <TTreeFormula::Compile>: Bad numerical expression : "func1.cpp" Error in <TTreeFormula::Compile>: Bad numerical expression : "func2.cpp"

Is there any way to work around TTree’s limitations?

Thank you in advance,
Davide

2

Hi Davide,

tree->Draw("func1.cpp:func2.cpp");is currently not supported/implemented.

[quote]Is there any way to work around TTree’s limitations?[/quote]You can extend (see in particular the documentation for MakeProxy and the tutorials/tree/h1analysisProxy* example) you func1.cpp to create and populate a 2D histogram.

Cheers,
Philippe.