Hi Gene,
I meant strstr and not strcmp.
However, looking into the code, I see that I deactivated the logic
in TTreeFormula where this logic is applied to TTree leaves.
I have activated the logic again in my development version 2.24/06
and also modified the test program Event to give an example.
With this version, you can do:
T.Draw("event.GetNtrack()","strstr(fType,\"type3\")!=0");
or
T.Draw("event.GetNtrack()","fType==\"type3\"");
Rene Brun
Gene Van Buren wrote:
>
> Hi - I realize my response to this is a bit late, but I decided I'd
> try this too.
>
> Rene Brun wrote:
> > Hi Steve,
> > In the current implementation of TClonesArray, all objects must be of
> > identical length. You can have something like
> > char[20]; as data member of a class in a TClonesArray
> > and then use the function strcmp in TTree::Draw expressions.
>
> This is incorrect. TFormula is used to compile the expression in
> TTree::Draw() (both the drawn expressions and the selection
> expressions), and TFormula does NOT recognize strcmp.
> While I wish it would, I'm sure there are many other functions
> people out there would like TFormula to interpret. Valery Fine
> pointed out to me that by the time you're done, you'll have
> written a full interpreter like CINT. Valery had the suggestion
> that perhaps (somehow), one could pass interpretting to CINT.
> Any ideas?
>
> -Gene Van Buren
This archive was generated by hypermail 2b29 : Tue Jan 02 2001 - 11:50:26 MET