Dear Alberto,
By quickly going through your mail, it seems to me that what you
need is a new class AliITSlayer which is derived from the class
AliCalorimeter (which is already available in the directory RALICE
of AliRoot). Then the modules of your AliITSlayer provide you all
the functionality you need as far as I can see.
Another solution is to use several instances of AliSignal (also
in AliRoot/RALICE), but then you have to take care of the
layering and segmentation yourself.
Cheers,
Nick.
--
Dr. Nick van Eijndhoven mailto:nick@phys.uu.nl http://www.phys.uu.nl/~nick
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Alberto Pulvirenti wrote:
>
> Dear all,
>
> given that I didn't succeed in finding the correct solution for my
> problem, I will expose it to all of you, to find the skilled one who
> knows how to solve it.
>
> I must create a collection class to store object of a class I created
> which is, essentially, an experimental point of a detector. This
> detector (ALICE ITS) is made of 6 sensible layers, so, for each point, i
> get not only its coordinates, but also its layer.
>
> Then, I must use these points to create some simple segments, linking
> them in couples, for each couple which satisfies some criterions.
> Just to know which is the criterion, I can say that I need that two
> points differ by 1 in the layer value (it's integer), and not more than
> a certain value in the phi and theta polar coordinates.
> Because I have to deal with many points, I would like to organize them
> in a mesh, divided in sectors with respect to the azymuthal (phi) angle,
> in order to have a fast retrieving of only the points I need. But the
> only collection class I am able to use well i the TObjArray, so I was
> obliged to construct, in my class, objects like " TObjArray **fUnits[6]"
> say a pointer for a matrix of TObjArrays. It seems too strange that
> there isn't a method to organize these points in a better way. I am sure
> that it's possible to use a collection class (that I don't know) where I
> can store all points maintaining a criterion to find the ones which are
> contained at least in a certain layer and a certain phi sector, in order
> to avoid to confront all the couples that are certainly not linkable.
> And all this without the terrible memory leaks that I had in my previous
> trials...
>
> I hope to have been clear in my explanation.
> I have guessed a solution: tha THashTable, but I'm not sure that It
> could work well for me, because (you can believe it?) I don't know well
> in what consists the "hashing" of a collection. If there is someone who
> uses these particular collections (maps, haslists, etc.), I will be
> grateful for knowing how they work, and for which kind of problems they
> are used.
>
> Thanks
>
> Alberto
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