Hi, I've been looking for a while how to save an electron candidate which contains in itself a list of associated (calorimeter) cells (you can also think of all tracks associated with a jet). In the attachment you can see the electron class EMS. I've removed all things irrelevent to my problem. The main program is in WZTree.cpp, which mainly does the following things: - Create a root tree with a branch (EM) containing all electron candidates - look into a parent root file, extract and fill the above branch with several electrons. - For each electron, find all cells in the (electron) cluster and save it - Finally save the tree Normally, if things work fine, I expect to have a branch EM which has some electrons (number unknown), each electron has some cells (number unknown either). Since these numbers are unknown, I use the TClonesArray to store these objects. The problem is that I succesfully track down all cells for each electron and make an array of them, but then when I tried to store all electrons to the approriate array the program broke with segmentation fault. It fails at the step calling WZTree::loadMyTree in the main loop, at the first time it's called. I thought using vector class would be easier, but not quite. May you check where the bug is. Frankly I have to say I don't understand a lot of TClonesArray, so I believe the trouble is somehow there. Thanks, T.
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