Hi Drew, Assuming that you have Myclass.h and Myclass.C (the two files generated by MakeClass) and a TChain chain object, do root > .L Myclass.C root > Myclass a(&chain) root > a.Loop() root > chain.Delete() Rene Brun Drew Alton wrote: > > Hello, > I am running over a large number of root-tuples and skimming out the > events I want to keep. > Given the number of files and events I have I want to keep some > separations. > My general plan is to chain a list of files from the same data set, > use MakeClass to make a class, which will skim out the ones of interest > to me. Then repeat it for each data set. Since all the data sets have > the same format, the same make class could be used, except that the .h > file will have the wrong list of root tuples. In the past I've just > changed this by hand, but it occures to me that it ought to be possible > at run time to read a file which contains the list of files to chain > together. > Has anyone ever done this...have any examples? > Thanks for the help. > -Drew
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