Dear ROOTers, recently I came across a technical problem, which hopefully has already been solved. Here it is: - I have a list of reconstructed tracks, each of tracks has its covariance matrix defined. Track data is a fixed length record. - for many reasons, in particular, in order to optimize the performance, I'd like to keep the tracks in TClonesArray. - the problem is related to the choice of the representation for the track error matrices: I don't see a proper matrix class in ROOT, which would allow to store tracks in TClonesArray. TMatrix* classes allocate memory dynamically and this seems to exclude them from the consideration. I certainly realize that I can use TObjArrays to keep tracks. THe question, however is if there is any way to have track covariance matrix represented by one of the ROOT matrix classes and the tracks stored in TClonesArray's? thanks, Pasha
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