Double plot

ROOT
1

Good morning,

I’m trying to get a plot like the attached one. So far I tried to use 2 TPads using SetTopMargin() and SetBottomMargin(), but I still get a blank space between the two pads, i.e. between the upper and the lower plots.

Might you suggest a better way?

Thanks a lot, and have a nice day,

 Ric.


2 
{
   TCanvas *c = new TCanvas("c","c");
   c->Draw();

   TPad *c_1 = new TPad("c_1", "c_1",0.1,0.3,0.9,0.9);
   c_1->SetBottomMargin(0.0);
   c_1->Draw();
   c_1->cd();
   c_1->DrawFrame(0.,0.,1.,1.);
   
   c->cd();
   c_2 = new TPad("c_2", "c_2",0.1,0.1,0.9,0.3);
   c_2->SetTopMargin(0.0);
   c_2->Draw();
   c_2->cd();
   c_2->DrawFrame(0.,0.,1.,1.);

}
3

It’s perfect!!
Thanks a lot for your help!! :slight_smile:

Ric.
4

Another question, sorry.

When I plot a histo on the lower pad, if I increase the x-axis title font, then the x-axis title goes “outside” the canvas.

Interactively I solve this by resizing the lower frame up with the mouse, and in this way the x-axis title “appear” again.

But how can I do programatically? I tried with SetBottomMargin() and setting different limits when I create the lower pad, but without success.

Which is the method to resize the frame inside a pad?

Thanks a lot again for your kind help,

Ric.

5

save the plot you got via interactive editing into a .C file (File/SavesAs) and look at the command doing that.
copy/paste it in your code