Re: [TMVA-users] using TMVA::Factory without input trees

[Jan T. <the...@ph...>]

Hi Rustem,

did you call

factory->PrepareTrainingAndTestTree("optionsgohere")

before calling TrainAllMethods?

Cheers
Jan

On Thu, 17 Nov 2011 11:08:13 +0100
  Rustem Ospanov <rus...@ce...> wrote:
> Hi Jan and Helge,
> 
> I have into problems with this approach. The "TrainAllMethods"
> function checks that DataInputHandler has at least one events,
> otherwise the job exits with kFATAL signal. Any suggestions?
> 
> http://root.cern.ch/svn/root/trunk/tmva/src/Factory.cxx
> 
> Thank you,
> Rustem
> 
> On Tue, Nov 15, 2011 at 5:02 PM, Jan Therhaag
> <the...@ph...> wrote:
>> Hi Rustem,
>>
>> yes, you can use the Factory without reading from a tree. Just 
>>create a
>> factory object and book the variables as you would normally do and 
>>then loop
>> over all events you would like to add. You have to fill a 
>>vector<double>
>> with the registered variables for each event (order!) and decide 
>>somehow if
>> the event is signal or background. Then add it like:
>>
>>  factory->AddEvent("Signal", eventType, vars, weight); //(or 
>>"Background"
>> instead or "Signal")
>>
>> The argument named eventType is either TMVA::Types::kTesting or
>> TMVA::Types::kTraining, depending on what you want to use the event 
>>for.
>>
>> You can then train/test/evaluate as usual.
>>
>> Cheers
>> Jan
>>
>> On Tue, 15 Nov 2011 16:41:46 +0100
>>  Rustem Ospanov <rus...@ce...> wrote:
>>>
>>> Hello,
>>>
>>> I have a question about using TMVA::Factory without input trees. 
>>>There
>>> is no example for such use case. Factory class has AddEvent method. 
>>>So
>>> is it possible to add events directly to Factory without reading 
>>>them
>>> from trees?
>>>
>>> Thank you,
>>> Rustem
>>>
>>>
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>>
>> --------------
>>
>> Jan Therhaag
>> Physikalisches Institut, Universität Bonn
>> Office: CERN bat. 304-1-042 Tel: +41 22 76 78052
>> eMail: the...@ph...
>>
>>

--------------

Jan Therhaag
Physikalisches Institut, Universität Bonn
Office: CERN bat. 304-1-042 Tel: +41 22 76 78052
eMail: the...@ph...