Hi Dan, A TTree is an object with a header (always in memory) and a list of TBaskets for each branch. When a TBasket is full, it is dumped to the file. The TBaskets are not visible in TBrowser but are via TFile::Map. If the resulting file is really "thousands of times" bigger than what you expect, I would suspect an error in your logic filling the tree. If you do not find it, please provide more info, such as the result of TTree::Print after all fills. Rene Brun dandwyer@socrates.Berkeley.EDU wrote: > > Hi, > > I'm having a problem with a huge file full of TBaskets. I am > processing a Tree (t1), and creating a smaller copy (fewer entries) of > it with some averaged data. I use the CloneTree(0) command to create > an initially empty tree (t2), and slowly fill it with processed data > from the original tree. Once I am done, I write this smaller tree to > a file (f1) by having it call t2->Write(). The problem is that the > file I save it in not only has the tree, but a few hundred TBasket > objects as well (which you can see by calling f1->Map(), but which are > not visible in the TBrowser). I do not call Write at any other point > in the program. The TBaskets cause my file to be thousands of times > larger than the tree I am trying to save. Why are these objects being > saved in the file? > > Thanks, > Dan
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