Hi Roland, It is not clear to me what you want to achieve. It looks like what you are requesting is already implemented in TTreeFormula. Rene brun Roland Kuhn wrote: > > Hi! > > I'd like to use TFormula's parsing capabilities in a ROOT application. > The problem is, that parameters with real names (like "sigma") cannot > be readily used since they trigger an error 30 (bad numerical > expression). Going through the formula in a pre-parsing step and > replacing the names with [0], [1], and so on kind of defeats the > purpose of this excercise, as I would need to write a parser myself, > which would have to know about all the special names ("sin", ...). > Unless someone can suggest a better solution, I would insert some code > into TFormula::Analyze so that the "error 30" case (after everything > else has been tried) is replaced by looking through the list of > parameter names, replacing this token with the appropriate [n] action, > adding it to the list first if it didn't yet exist. This should > probably be configurable as it changes the user interface considerably. > It's the first time I dig so deeply into ROOT, so if you have any help > to offer, I would kindly accept any suggestions you wanted to make. > > Ciao, > Roland > > -- > TU Muenchen, Physik-Department E18, James-Franck-Str. 85747 Garching > Telefon 089/289-12592; Telefax 089/289-12570 > -- > A mouse is a device used to point at > the xterm you want to type in. > Kim Alm on a.s.r. > > -------------------------------------------------------------------------------- > Name: PGP.sig > PGP.sig Type: application/pgp-signature > Encoding: 7bit > Description: This is a digitally signed message part
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