Re: variable length array leafs in TTree

Thanks a lot!
(sent once, on the 3rd try)

Panos
On Wed, Jan 19, 2011 at 4:34 PM, Philippe Canal <pcanal_at_fnal.gov> wrote:

> Hi,
>
> Try this simplification:
>
> mini->Project("hh","TrackAA[0]"," (NTracksB>0 && Charge[0]==-1) ||
> (NTracks>=1 && Charge[0]==1 && Alt$(Charge[1],0)==-1)")
>
> Cheers,
> Philippe.
>
>
> On 1/19/11 8:43 AM, gerontas wrote:
>
>>
>>
>> Hello,
>> sorry for the 3 mails. I hope you get this once.
>> (well, not quite, sorry!)
>>
>> > you could use
>> > Alt$(Array[0]==1 && Array[1]==-1, Array[0]==-1)
>> > where the second parameter is used if the first doesn't exist. See the
>> > documentation for TTree::Draw():
>> > <http://root.cern.ch/root/html/TTree#TTree:Draw%2>
>> I get an error:
>> root [1] mini->Project("hh","TrackAA[0]","Alt$((NTracksB>0
>> &&Charge[0]==-1),NTracks>=1 && (Charge[0]==1 &&Charge[1]==-1))")
>> Error in <TTreeFormula::DefinedVariable>: The 2nd arguments in
>> Alt$((NTracksB>0&&Charge[0]==-1),NTracksB>=1&&(Charge[0]==1&&Charge[1]==-1))
>> can not be an array (NTracksB>=1&&(Charge[0]==1&&Charge[1]==-1),-1)!
>> Error in <TTreeFormula::Compile>: Bad numerical expression :
>> "Alt$((NTracksB>0&&Charge[0]==-1),NTracksB>=1&&(Charge[0]==1&&Charge[1]==-1))"
>> I understand I may have not been clear enough on what I want to do; the
>> problem arrays are in the condition, not to be plotted/selected.
>> If the above is still unclear, I will try to provide a minimal example.
>>
>> Thanks a lot in advance!
>> Panos
>>
>
Received on Wed Jan 19 2011 - 17:04:28 CET