TF1 name and title disappear from ROOT 5 to 6

ROOT
1

Hi,

when I open a canvas from file test.root (46.3 KB) with ROOT 6 all names and titles of the contained TF1s have disappeared. This causes problems when searching for a TF1 via canvas->FindObject(“objectname”). Any ideas on this?

TFile *f1 = TFile::Open("test.root");
TCanvas *cnvMTF = (TCanvas*)f1->Get("cnvMTF");
cnvMTF->GetListOfPrimitives()->ls();

Output with ROOT 5.34.32:

Output with ROOT 6.04.02:

2

Hi,

I run ROOT 6.03/02 on a Debian Linux. I could not reproduce the problem. The TF1-Names look fine here:

root [0] TFile *f = TFile::Open("test.root")
(class TFile *) 0x2e43550
root [1] f->ls()
TFile**         test.root
 TFile*         test.root
  KEY: TCanvas  cnvMTF;1        MTF
root [2] TCanvas *can = (TCanvas*)f->Get("cnvMTF")
(class TCanvas *) 0x3827e60
root [3] can->GetListOfPrimitives()->ls()
OBJ: TList      TList   Doubly linked list : 0
 TFrame  X1= -0.035000 Y1=-0.050000 X2=1.435000 Y2=1.500000
 OBJ: TH1F      Graph    : 1 at: 0x3887700
 OBJ: TF1       fcnMTF1 Modulation Transfer Function;Spatial frequency [mm^{-1}];MTF : 1 at: 0x38ad590
 OBJ: TF1       fcnMTF2 Modulation Transfer Function;Spatial frequency [mm^{-1}];MTF : 1 at: 0x38e1da0
 OBJ: TF1       fcnMTF3 Modulation Transfer Function;Spatial frequency [mm^{-1}];MTF : 1 at: 0x38e4310
 OBJ: TF1       fcnMTF4 Modulation Transfer Function;Spatial frequency [mm^{-1}];MTF : 1 at: 0x38e6860
 TLine  X1=-0.035000 Y1=0.100000 X2=1.435000 Y2=0.100000
 TLine  X1=-0.035000 Y1=0.500000 X2=1.435000 Y2=0.500000
 OBJ: TPaveText TPave   X1= 1.248924 Y1=0.110671 X2=1.351266 Y2=0.195732
 OBJ: TPaveText TPave   X1= 1.248924 Y1=0.509512 X2=1.351266 Y2=0.594573

Cheers,
Jochen

3

It took a while but I compiled ROOT 6.03.02 on OpenSUSE 13.1 and you are right - name and title are still there.

Then I recompiled ROOT 6.04.02 with default configuration in case my extensive changes were the reason, but they were not - name and title disappear still!!!

So, I conclude whatever goes wrong was introduced between 6.03.02 and 6.04.02. I guess there must be release notes somewhere…

Can anybody out there reproduce the problem with 6.04.02?

4

I get this problem with 6.04.02, too.

5

OK, I see that TF1 changed a lot, e.g. not inheriting from TFormula anymore but directly from TNamed.

When saving a TF1 to file from ROOT 6.04.02 and loading it again with the same ROOT version all works as it should.

Is the lack of backward compatibility intended or accidental? I might not be the only one having stored tons of TF1s that would be sort of lost without name/title because identifiying them all manually is just not feasible.

Do I have to file a formal request for implementation of backward compatibility in the “bugs” section or does this forum post suffice?

6

Hi,

This problem should have been fixed already for the newest dev version 6.05.02.
See also the JIRA item sft.its.cern.ch/jira/browse/ROOT-7623

Lorenzo