Suppose I do TFormula* f1 = new TFormula("f1","x+y"); TFormula f2("f2","f1+2") ; delete f1; f2.GetTitle() doesn't return "x+y+2". It returns "f1+2" I want to get "x+y+2" even if f1 is deleted. Since the formula is implicitly stored in f2 member variables (I'm able to Eval() even when f1 is deleted), I should be able to retrieve it Thank you Pierre-Luc Drouin On Thu, 12 Jun 2003, Rene Brun wrote: > Pierre-Luc, > > same answer as before. A TF1 is a TFormula. If you have > TF1 f("f:,"sin(x)/x",0,10); > f.GetTitle() returns "sin(x)/x" > > Rene Brun > > On Thu, 12 Jun > 2003, Pierre-Luc Drouin wrote: > > > Hi, > > > > My question was not very clear... sorry > > > > I've in a ROOT file a TF1 object that has been created using an user > > defined TFormula. I mean that the formula of the TF1 object > > (TNamed::fTitle) contains the TNamed::fName of an user define TFormula > > object. This TF1 object has been compiled and has been written in a ROOT > > file. Now I have to open the ROOT file, load the TF1 object and retrieve > > its > > formula. The formula is stored in the TFormula object tables of the TF1 > > object and the TNamed::fTitle member variable contains the TFormula > > object name (this TFormula object doesn't exist anymore because only the > > TF1 object is contained in the ROOT file). > > > > I want to get the mathematical expression of the function contained in the > > TF1 object, expression that doesn't depend on a TFormula object name. It's > > not a problem if this expression is different from the original expression > > (when the TF1 object has been created the first time), I just want it to > > be equivalent. I want to apply a scaling factor and some complexe cuts on > > the TF1 > > object, so it's essential to retrieve the expression. > > > > Thank you! > > > > Pierre-Luc Drouin > > > > On Thu, 12 Jun 2003, Rene Brun wrote: > > > > > Hi Pierre-Luc, > > > > > > TFormula is a TNamed. If you have TFormula* f, do > > > f->GetTitle(); > > > > > > Rene Brun > > > > > > On Thu, 12 Jun 2003, > > > Pierre-Luc Drouin wrote: > > > > > > > Hi, > > > > > > > > How can I retrieve the formula string from a TFormula instance if > > > > SetTitle() has been called to change the default title by something else? > > > > > > > > Must ROOT users not call SetTitle() with a non mathematical string? > > > > > > > > Is it possible to retrieve a formula string from TFormula object tables? > > > > > > > > Thank you! > > > > > > > > Pierre-Luc Drouin > > > > > > > > > >
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