ROOT Version: v06_14_02 Platform: Not Provided Compiler: Not Provided okay, so I have a file with a TTree with different leaves, out of which I need three specific branches. However, when i try to access the data from “nu” i cant access the data correctly (i get weird values or if I set the nu_…

From your code I see nothing wrong. If you have more than 2^31 entries (roughly 2 billion) in the chain you should use the datatype Long64_t instead of int for the variables i and entries, but as long as you stay below 2^31 it should be no problem. Have you tried whether it works if you don’t use …

I am trying to work on accessing the here are the print outputs: match trig frame crate card channel plane wirenum wire t packett i carryover starts_with_huffmann huffmann sn sn_boiled1 sn_boiled2 sn_boiled3 sn_boiled sn_prev sn_next nu sn_bits nu_bits sn_nu_bits packet st…

This looks really strange. For me the output of TTree::Print() looks like this: ****************************************************************************** *Tree :tDat : Lambda Analysis Tree * *Entries : 4054048 : Total = 85560332 bytes File Si…

sorry, here it is *Tree :match : matched_samples * *Entries : 79303973 : Total = 8248238129 bytes File Size = 910180782 * * : : Tree compression factor = 9.06 * ********************************************…

Ok, so the branch “nu” is a subbranch of “match”, but in case the branch is not found you would get an error message. I’m wondering why you set the basket size to 25.6 MB, Default is 32 kB. Furthermore the type of “nu” is int and in your code you use unsigned int but this should not cause such probl…

Unfortunately, i didn’t create the file! But I do have a second question which might help me bypass the problem. Is there a way to write a into a second root file, a ttree->draw(result)?

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Accessing the data inside a Ttree leaf

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Wile_E_Coyote February 25, 2019, 9:26pm 8

Header files for Trees ROOT

“Most recent” documentation about how to generate and use an “analysis skeleton”: TTree::MakeClass (see also “ROOT User’s Guide” → “Trees” → “Using TTree::MakeClass”) TTree::MakeSelector (see also “ROOT Primer” → “File I/O and Parallel Analysis” → “N-tuples in ROOT” → “For the advanced user: Processing trees with a selector script” and “ROOT User’s Guide” → “Trees” → “Using TTree::MakeSelector” and “ROOT User’s Guide” → “Example Analysis”) TTree::MakeProxy ROOT::RDataFrame (uses the T…

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