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.
>
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