Reading the branches of a class

[kanhaiya-gupta]

Dear Experts,

I am facing a problem to read the branches of the classes. I tried to follow the previously asked questions. But I could not figure it out.

Here I have attached my branches list, the expected output and the macros used.

Thank you
Kanhaiya Gupta

delphes_analysis.C (1.3 KB)

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ROOT Version: Not Provided
Platform: Not Provided
Compiler: Not Provided

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[jalopezg]

Hello @kanhaiya-gupta,

Can you please be more concise about the issue that you are having? Also, you have some tutorials that you can use for reference here. Maybe you find useful this particular one.

Cheers,
J.

[kanhaiya-gupta]

I am getting an unexpected output. I don’t know what is a mistake in my code.

[jalopezg]

Hello,

It seems to me that you are misusing the TBranch API. Please look at the aforementioned tutorial -it looks similar to what you are trying to accomplish-. Also, please read this documentation on TTree.

Cheers,
J.

[kanhaiya-gupta]

I am sorry. I applied the example code uploaded by @brun for this question. Can you please forward some example of reading sub-branches of tree in root file.

Thank you

Problem reading sub branch from tree

When you do: Float_t myvar; TFile *inpfile = new TFile(fullname); TTree *inptree = (TTree*) inpfile->Get("EGAMMA"); TBranch * branch=inptree->GetBranch("brem.Pbrem.fE"); branch -> SetAddress(&myvar); you tell ROOT to read the variable length array in the branch “brem.Pbrem.fE” into one single variable “myvar”. Instead myvar should be an array with the maximum dimension in the branch. In the attachement you will find a small example to read the tree4.root file generated by …