Hi all, I tried something like this #includes... Int_t Macro(Int_t Dimension) { if (Dimension ==2) TH2F* histo = new TH2F("histo"...) else if (Dimension ==3) TH3F* histo = new TH3F("histo"...) But later in the code I want to fill histo if (Dimension == 2) histo->Fill(...) else if (Dimension == 3) histo->Fill(..) But during compilation with Aclic, it complains at fill-time that histo is undeclared. So is conditional declaration not allowed then? Or how could I achieve what I want to do? Greetings, Michael PS.: root 3.05/03, gcc 3.2 under Linux -- K.-Michael Aye, University of Durham, Dept. of Physics Phone@Work: +44-191-374-2345, Fax@Work: +44-191-374-3749 "Because the exploration of space knows no national boundaries, the loss of the Columbia is a loss to all humankind!"(Kofi Annan)
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