Reading dataset from a tree

ROOT
1

Hello,

I am reading RooDataSet out of a root tree.

I tried both
RooDataSet* data1 = new RooDataSet(“data”,“myanalysis.root”,“mumug”,RooArgSet(p_r9,p_eta,m3));

and

 TFile *file_in = new TFile("myanalysis.root","update");
 TTree *mumug = (TTree*) file_in->Get("mumug");
RooDataSet* data1 = new RooDataSet("data","data",mumug,RooArgSet(p_r9,p_eta,m3));

and every time I get these messages:

Error in TTree::Fill: Failed filling branch:mumug.scale, nbytes=-1
This error is symptomatic of a Tree created as a memory-resident Tree
Instead of doing:
TTree *T = new TTree(…)
TFile *f = new TFile(…)
you should do:
TFile *f = new TFile(…)
TTree *T = new TTree(…)

now perhaps even more interestingly, in former case the program runs, while in the latter case I get segmentation fault when I try to fit.

any ideas?
I’m using root 5.16 on Mac OS

thanks,
Yuri

2

Hi,

This has been fixed in ROOT 5.17/02

Wouter