Hi Sebastien, You have very serious scope problems in your code. Nothing to do with ROOT. In your function getrootuple::getGTracks, you define TVectorD helix1(5); TMatrixD error1(5,5); then you create tracks objects using the helix1 and error1 arrays. THESE OBJECTS ARE AUTOMATICALLY DELETED when you leave getTracks, you cannot use them in the calling function. Rene Brun On Wed, 19 Jun 2002, Sebastien Greder wrote: > > Here are the different files : > > /afs/in2p3.fr/home/g/greder/public/example.tar.gz > > Thanks, > sebastien. > > >
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