variable length array leafs in TTree

>
> Hello roottalk,
>
> I have a TTree which includes an integer value, Length, and an integer
> array Array, with 'Length' elements.
> In the way it is created (to save space), Array[i] is only written if
> Length>=i.
>
> When I try to project (or draw, or...) from this tree the following
> >tree->Draw("somevariable","(Length>0 && Array[0]==-1)||(Length>1 &&
> Array[0]==1 && Array[1]==-1)
> only the entries for which there exists an Array[1] element are selected.
> (In other words, ROOT does check the existence of all elements making up the
> varexp for validity, irrespective of the "local logic" validity). Then only
> the AND of the two expressions instead of the OR is returned.
> I think this is the correct thing to do (it would be dangerous to assume
> the existence of all variables), but I am not sure how to circumvent this
> problem...Should I revert to a fixed array length?
>
> Thanks,
> PS
>
Received on Wed Jan 19 2011 - 08:23:34 CET