Re: Trouble with trees

From: Mario Kadastik <mario.kadastik_at_cern.ch>
Date: Wed, 8 Jul 2009 11:03:55 +0300

> It is likely an alignment problem within a struct when using data
> types of different lengths. I cannot reproduce it on my machines.
> Could you run the attached script on your machine and let me know if
> it works?
> It is better to pass the struct pointer instead that the description
> of the individual members, ie replace
> tree->Branch("cutvars",&cutvars.s,"s/I:mRel/
> D:sumpt:pt1:pt2:pt3:pt4:dRp:dRn:met:nTau/I");
> by
> tree->Branch("cutvars",&cutvars);

Ran your code and it worked just fine. Then I took the generated root file and ran my code on it (the same printTree.C that I copied to the e-mail previously) and it produced the same result (worked just fine). So it seems to be a saving issue with CMSSW somehow. By the way I can get the variables out manually:

root [2] t->Show(1)
======> EVENT:1

  s               = 1
  mRel            = 1.00941
  sumpt           = 447.262
  pt1             = 44.2483
  pt2             = 88.4943
  pt3             = 113.021
  pt4             = 201.498
  dRp             = 0.967189
  dRn             = 1.10596
  met             = 22.8287
  nTau            = 0

root [3] t->GetLeaf("mRel")->GetValue()
(const Double_t)1.00940619557053046e+00

And you see that it's Double_t. The interesting part is that GetLeaf also shows s to be Double_t:

root [4] t->GetLeaf("s")->GetValue()

(const Double_t)1.00000000000000000e+00

Odd...

You can get my tree.root file (generated with CMSSW) from http://neptune.hep.kbfi.ee/~mario/tree.root   just to see if you can understand what goes wrong in the saving process...

Mario Received on Wed Jul 08 2009 - 10:04:01 CEST