---------- Forwarded message ---------- From: Martin Turner <martin@hep.ph.liv.ac.uk> To: Rene Brun <Rene.Brun@cern.ch> Date: Wed, 8 May 2002 21:59:59 +0100 (BST) Subject: Leaves that are a dynamic array. Hi Root experts. I'm afraid I stumbled across another problem. Hopefully this will be quick. I want to build arrays of variable size onto a single branch. What is wrong with these code snippets: fLambdaBfile = new TFile("LambdaB_analysis.root","recreate"); fLambdaB_tree = new TTree("LambdaB_analysis","lambdaB analysis tree"); fLambda_selection.fcandidate=10;//initialize size of the arrays to something fLambdaB_tree->Branch("Lambda_selection",&fLambda_selection,"fcandidate/I:==> flambda_momx[fcandidate]/D:flambda_momy[fcandidate]:flambda_momz[fcandidate]:==> ftrack_idi[fcandidate]/I:ftrack_idj[fcandidate]:ftrack_motheridi[fcandidate]:==> ftrack_motheridj[fcandidate]:ftrack_granidi[fcandidate]:==> ftrack_granidj[fcandidate]:fientry"); members are defined in the header file like this: struct Lambda_selection{ Int_t fcandidate; Double_t flambda_momx[10]; Double_t flambda_momy[10]; Double_t flambda_momz[10]; Int_t ftrack_idi[10],ftrack_idj[10]; Int_t ftrack_motheridi[10],ftrack_motheridj[10]; Int_t ftrack_granidi[10],ftrack_granidj[10]; Int_t fientry; }; Lambda_selection fLambda_selection; When defining the branch, if I replace [fcandidate] with [10] I don't have a problem, just a lot of wasted memory. fcandidate never exceeds 10. At the TTree::Branch the error is: ERROR leaf:flambda_momx, len=10 and max=0 ERROR leaf:flambda_momy, len=10 and max=0 etc. Putting fcandidate last on the list gives an "Illegal leaf" error. How do I get round this without splitting my leaves onto seperate branches? Thanks for yor help. Martin
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