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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