Help with TGaxis

[kbo]

I have two histograms. I plotted one histogram and using TGaxis I added one new x axis on the top of the pad. My second histogram is for that new axis. How do I plot second histogram on the same pad. More specifically, My first histogram has x axis from -10 to 10 and my second histogram has x axis from 0 to 100.When I plot second histogram it is shown up to 10 not up to 100.Y axis in both is just counts. In one sense -10 of first histogram corresponds to 0 for second histogram.
This is the process I used

TCanvas *c= new TCanvas();
r1->Draw();//r1 is my first histogram from -10 to 10
TF1 *f1 = new TF1("f1","x",0,100);
TGaxis *A = new TGaxis(-10,25,10,25,"f1",10,"+",5);
A->Draw();
r2->Draw("hist same");//r2 is my second histogram

Any Help will be appreciated.
Thank You
KB

[jblomer]

Hello,

Could you post your full macro so that we can try to reproduce what you’re getting?

Cheers,
Jakbo

[kbo]

Hi Jakbo,
Here is the code.test.C (927 Bytes)

Thank You
KBUnderAllNW_VWBar18_VWPosAndTDCHistogramWithWithoutNWForGatingof12.root (10.4 KB)

[jblomer]

Thank you! I see the problem now, actually I’m not sure if you can easily combine two x axis in the same plot. For two y axis, there is a tutorial.

@couet Are the different x axis possible?

[Wile_E_Coyote]

Try (you will need to “convert” it to use histograms instead of graphs):

Draw two graphs on one canvas with different Y scales

Note: the attached macro draws graphs with different x- and y- axes ranges. comp.cxx (2.1 KB) pkppontsprod7.txt (19 Bytes) ptotprod7.txt (30 Bytes)

BTW. Maybe you simply want:

{
  TCanvas *c = new TCanvas("c", "c");
  c->DrawFrame(-10, 0., 100., 25., "My Title;My X;My Y"); // draw the frame
  TF1 *f1 = new TF1("f1", "x", 0., 100.);
  f1->Draw("SAME"); // draw the function
  r1->Draw("HIST SAME"); // r1 is my first histogram from -10 to 10
  r2->Draw("HIST SAME"); // r2 is my second histogram
}

[kbo]

Thank You all for your help