Set histo title offset

[bethlong06]

I have a canvas of 16 different histograms and for some reason their titles are being drawn on top of the pads. How can I move them up so that they don’t cover the plot?
Thanks

[couet]

{
   TH1F *h1= new TH1F("h1","histogram 1",100,-5,5);
   h1->FillRandom("gaus",10000);
   h1->Draw();
   gPad->Update();
   TPaveText* title = (TPaveText*)gPad->FindObject("title");
   title->SetY1NDC(0.5);
   title->SetY2NDC(0.6);
   gPad->Modified();
   gPad->Update();
}

[bethlong06]

The only problem is I’m using pyroot, I tried

title = gPad.FindObject("title")

but this gives me the error:

title.SetY1NDC(0.5)
    ^^^^^^^^^^^^^^
AttributeError: 'TObject' object has no attribute 'SetY1NDC'

so I tried:

title = TPaveText(gPad.FindObject("title"))

but I got

TypeError: none of the 3 overloaded methods succeeded. Full details:
  TPaveText::TPaveText(const TPaveText& pavetext) =>
    TypeError: could not convert argument 1
  TPaveText::TPaveText() =>
    TypeError: takes at most 0 arguments (1 given)
  TPaveText::TPaveText(double x1, double y1, double x2, double y2, const char* option = "br") =>
    TypeError: takes at least 4 arguments (1 given)

[couet]

An other way:

void titlepos(){
   TH1F *h1= new TH1F("h1","histogram 1",100,-5,5);
   h1->FillRandom("gaus",10000);
   gStyle->SetTitleX(0.3);
   gStyle->SetTitleY(0.5);
   h1->Draw();
}

[bethlong06]

This works but as soon as the title is just above the plot it gets covered by the pad above

for i_plot in range(16):
    canvas_x_channels.cd(i_plot+1)
    x_temp_list = [sublist[i_plot] for sublist in analogues_x]
    [x_histo.Draw("same") for x_histo in x_temp_list]
    x_temp_list[0].SetTitle(f"x_channel{x_channels[i_plot]}")
    gStyle.SetTitleX(0.3);
    gStyle.SetTitleY(1.02)

[couet]

@bethlong06

gets covered by the pad above

It means your pads overlap… avoid that.

[bethlong06]

How do I avoid that? My pads are created like this:

my_canv = ROOT.TCanvas("my_canv ","my_canv ",1800,1400)
my_canv .Divide(4,4)

[couet]

Well , I do not know enough of your case to know what should be change. I can try to reproduce it with he follwoing code. But it is fine for me:

{
   auto c1 = new TCanvas("c1","multipads",1800,1400);
   gStyle->SetOptStat(0);
   c1->Divide(2,2);
   auto h1 = new TH2F("h1","test1",10,0,1,20,0,20);
   auto h2 = new TH2F("h2","test2",10,0,1,20,0,100);
   auto h3 = new TH2F("h3","test3",10,0,1,20,-1,1);
   auto h4 = new TH2F("h4","test4",10,0,1,20,0,1000);

   c1->cd(1);
   h1->Draw();

   c1->cd(2);
   h2->Draw();

   c1->cd(3);
   h3->Draw();

   c1->cd(4);
   h4->Draw();
}

[bethlong06]

Ok, thank you, it seems that my PadTopMargin was too small.