Hello, I would like to know iof there is a way to use a variable in the TTree::Draw expression. For example, if I have a TFile that contains a TTree, I can do
whete t is the TTree and “A” a leaf of the tree. However it does not work anymore if I do
int foo=10
t->Draw("A-foo")
In pratice, a TParameter is prezsent in the TFile and I would like to do something like that
root [1] int startTime = ((TParameter<int>*)_file0->Get("StartTime"))->GetVal();
root [2] t->Draw("Time-startTime")
Error in <TTreeFormula::Compile>: Bad numerical expression : "tempsDebut"
Info in <TSelectorDraw::AbortProcess>: Variable compilation failed: {Temps-tempsDebut,}
Do you have any key to do that?
