TDirectory question. Noob alert

ROOT
1

Hi all,

Noob question follows.

I have an ntuple whose structure/hierarchy is as follows and I wish to save as a CSV file simply because I’d rather work in Matlab and/or Excel with which I’m more familiar:

TFile
	|->TDirectoryFile
				|->TNtuple
						|->TLeafF
						|->TLeafF


						|->TLeafF
				|->TNtuple
						|->TLeafF
						|->TLeafF


						|->TLeafF

Many examples exist but none (as far as I can see) with a similar structure to the above. For example conductivity_experiment.root:

TFile
	|->TNtuple
			|->TLeafF
			|->TLeafF


			|->TLeafF

Needless to say the introduction of the extra level is throwing me off. How could I include the TDirectory in the second example?

I’m using root 6.12/04 on Ubuntu 16.04 and gcc 5.4.0

Regards

Tim

2

Apolologies for loss of formatting during post…

3 
auto f = TFile::Open(filename,"READ");
if (!f) return;
auto d = f->GetDirectory(directory_name);
if (!d) return;

TNtuple *ntuple;
d->GetObject(ntuple_name, ntuple);
if (!ntuple) return;

.....
4

Thanks pcanal. I’ll get onto it.

Regards

Tim

5

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