Re: MakeProxy and friend TChains

Hi Scott,

Thanks for reporting this issue. The problem is fixed (by revision 29044 of the trunk)
and your test has been added to our nightly tests.

Thanks,
Philippe.

Scott Fallows wrote:
> Hi Philippe,
>
> I've attached an archive containing four data files that I generated
> for this purpose along with my scripts.
>
> I run .x testvertex.C++, which creates chains from the data using
> make_chains.cxx and calls vertex.C, which outputs the value of a
> branch from the first tree and one from the friend tree. Each data
> file contains 500 events, so Process is set up in testvertex.C to
> start at event 480 and loop over the next 40 events.
>
> When I run this, I get correct values for the branch from the friend
> tree for the first 20 events, and then start getting 0 when events
> from the second file are read.
>
> I hope this example is sufficient to see the problem, in either
> MakeProxy or my own code.
>
> Thanks,
> Scott
>
>
>> Hi Scott,
>>
>> Can you provide a concrete running example of both your successes
>> (with TTree) and failures (with TChain)?
>>
>> Thanks,
>> Philippe.
>>
>> Scott Fallows wrote:
>>> Hello,
>>>
>>> I've been able to use MakeProxy with AddFriend-ed TTrees, but am
>>> having difficulty doing the same with TChains. When macrofilename()
>>> accesses a branch from a file after the first in the friend chain,
>>> all events have value 0 (or, occasionally, the value of the branch
>>> for the last event from the first file).
>>>
>>> Should TChain be compatible with the Friend features of MakeProxy?
>>> If it is currently not, I would like to request that this feature be
>>> considered for implementation.
>>>
>>> System: x86, root 5.22/00a
>>>
>>> Thanks,
>>> Scott
>>>
>
Received on Wed Jun 17 2009 - 03:42:28 CEST