TMathText from TPad in TFile

ROOT
1

Dear experts.

A colleague gave me his TFile which contains a TCanvas which is divided into two TPads. There is a TMathText field attached to the TPad and I would like to alter it, redraw and save the TCanvas (which is the reason why I asked him for the TFile). However, doing an canvas->ls() tells me that there is no reference nor name for the text field in question. I merely know the text content (and NDC location). How can I still modify this?

In the ROOT prompt output below the last line is the one of interest.

Thanks a lot for your advice!
heico

root [3] TCanvas* c = (TCanvas*) _file0->Get("canvas")
(TCanvas *) 0x7f8e4acf68d0
root [4] c->ls()
Canvas Name=canvas Title=canvas Option=
 TCanvas fXlowNDC=0 fYlowNDC=0 fWNDC=1 fHNDC=1 Name= canvas Title= canvas Option=
  OBJ: TList	TList	Doubly linked list : 0
   TPad fXlowNDC=0 fYlowNDC=0 fWNDC=1 fHNDC=1 Name= bottom_pad_19 Title= bottom_pad Option=
    OBJ: TList	TList	Doubly linked list : 0
     [...]
   TPad fXlowNDC=0 fYlowNDC=0 fWNDC=1 fHNDC=1 Name= top_pad_18 Title= top_pad Option=
    OBJ: TList	TList	Doubly linked list : 0
     [...]
     OBJ: TH1D	bkg_Data 2b_10_copy	 : 1 at: 0x7f8e4ae003f0
     Text  X=0.915000 Y=0.809000 Text=150 < p_{T}^{miss} #leq 200 GeV
2

Can you post the TFile ?

3

Dear couet!

Thank you for your response. I do not think I am allowed to share the original TFile.
But I found another one with a similar text field without reference, and that one is public,
see: http://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/SUS-16-039/CMS-PAS-SUS-16-039_Figure_013.root

Again, the last line in the print out below is the text object in question.

Thank you!
heico

root [2] TCanvas* c = (TCanvas*) _file0->Get("TChiSlepSnu_FD")
(TCanvas *) 0x7ff300e4bf50
root [3] c->ls()
Canvas Name=TChiSlepSnu_FD Title=TChiSlepSnu_FD Option=
 TCanvas fXlowNDC=0 fYlowNDC=0 fWNDC=1 fHNDC=1 Name= TChiSlepSnu_FD Title= TChiSlepSnu_FD Option=
  OBJ: TList	TList	Doubly linked list : 0
   [...]
   Text  X=232.000000 Y=863.500000 Text=Observed #pm 1 #sigma_{theory}
4

If you need to alter a text only once the easiest is surely to open the editor from the View menu in the TCanvas then click on the text and modify it.

5

Sometimes it is easier than expected! :slight_smile: I wasn’t aware of that vast functionality…
Thanks couet, I will try like this and repost a message in case I get stuck again…

heico