Hi everybody, I have some questions about the TTree and collection classes: 1) is it possible to CHANGE the value of a leaf in a selected entry of a TTree? If so, how it should be done? 2) when using a TTree::Draw() method with a condition, I was unable to return to the initial "unconditioned" list of entries... is there something to do, to reset the TTree and its entry variables (the ones I get wit TTree::GetV1() & similar) 3) When using the TObjArray::Remove() or RemoveAt(), does it also delete the object i want to remove? If not, is there another method which does this? 4) What difference of utilization scopes is there between TObjArray, TList and THashList? And which are, the latter's particular characteristics? 5) using an "aliroot" session (for who knows it) I wasn't able to clean the RAM when clearing the TObjArrays I used... I must say that, in my class, they are declared as stack data-member (not pointers). Should I declare them in a different way? Thanks.... Alberto
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