Hi Yannick The problem is fixed now in CVS. The TFormula::Streamer function called when cloning a TF1 object was not adding the new function to the list of functions in gROOT. Rene Brun Patois Yannick wrote: > > Hello rooters, > > There must be something very fundamental I dont get in the naming of > root objects. > Could someone point me the doc I should read to understand why the > following is wrong ? : > > // Create and fill an histogram, just for demonstration > root [0] TH1F *h1=new TH1F("h1","H1",100,-10,10); > root [1] h1->FillRandom("gaus", 2000); > // Create a function called 'f1'. > root [2] TF1 *f1=new TF1("f1","gaus") > root [3] h1->Fit("f1") // This works well > // Create a copy of f1 under the name "f2" > root [4] TF1 *f2=(TF1*)f1->Clone("f2") > root [5] f2->GetName() > (const char* 0x88bce5c)"f2" // Name is indeed f2 > root [6] h1->Fit("f2") > Error in <TH1F::Fit>: Unknown function: f2 > ??? Function "f2" is not known, but I just defined it ! > > This also append when I 'rename' objects using SetName() method. > > I'm sure it's something very basic I didnt get in the way ROOT works. > Any information would help, thanx :) > > Yannick
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