Ye Shuwei wrote: > > Hi, > > I use TTreeFormula to select interested events in a TTree. And to speed > up, I activates only those variables used in the TTreeFormula. I do it via > invoking "TTree::SetBranchStatus" one by one. It would be nice and more > convenient to have a function in TTreeFormula to activate all the variables > used inside. Thanks in advance. > When you use TTree::Draw function, TTreeFormula objects are created. As you say these objects know which variables are referenced. If you look (in the pretty complex!) logic of TTree::EventLoop, you will see how only referenced branches are read. I understand that you would like a new function setting automatically the branch status active for only the branches referenced in all the expressions. > BTW, Rene, what is the email address of CERNLIB team ? I want to send > suggestion on creating CERNLIB with PIC option at HP-UX. Thanks. I was surprised to see that it took me many clicks on the Web to find this info. At the end, I believe that I found the right info. Try heplib.support@cern.ch Rene Brun
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