# How to draw a plot with multi-axis, curves

Dear all,

I would like to draw a plot similar to the one attached. I tried TGaxis class, but cannot find the answer. Could some of the experts give me an idea how to deal with this one? Thank you very much. It’ll be perfect if you have an example.

Best Regards,

Jie

see example below

Rene

[code]void gerrors2() {
TCanvas *c1 = new TCanvas(“c1”,“gerrors2”,200,10,700,500);
c1->SetFillColor(42);
c1->SetGrid();

``````  // draw a frame to define the range
``````

TH1F *hr = c1->DrawFrame(-0.4,0,1.2,12);
hr->SetXTitle(“X title”);
hr->SetYTitle(“Y title”);
c1->GetFrame()->SetFillColor(21);
c1->GetFrame()->SetBorderSize(12);

``````  // create first graph
``````

const Int_t n1 = 10;
Double_t x1[] = {-0.22, 0.05, 0.25, 0.35, 0.5, 0.61,0.7,0.85,0.89,0.95};
Double_t y1[] = {1,2.9,5.6,7.4,9,9.6,8.7,6.3,4.5,1};
Double_t ex1[] = {.05,.1,.07,.07,.04,.05,.06,.07,.08,.05};
Double_t ey1[] = {.8,.7,.6,.5,.4,.4,.5,.6,.7,.8};
TGraphErrors *gr1 = new TGraphErrors(n1,x1,y1,ex1,ey1);
gr1->SetMarkerColor(kBlue);
gr1->SetMarkerStyle(21);
gr1->Draw(“LP”);

``````  // create second graph
``````

const Int_t n2 = 10;
Float_t x2[] = {-0.28, 0.005, 0.19, 0.29, 0.45, 0.56,0.65,0.80,0.90,1.01};
Float_t y2[] = {0.82,3.86,7,9,10,10.55,9.64,7.26,5.42,2};
Float_t ex2[] = {.04,.12,.08,.06,.05,.04,.07,.06,.08,.04};
Float_t ey2[] = {.6,.8,.7,.4,.3,.3,.4,.5,.6,.7};
TGraphErrors *gr2 = new TGraphErrors(n2,x2,y2,ex2,ey2);
gr2->SetMarkerColor(kRed);
gr2->SetMarkerStyle(20);
gr2->Draw(“LP”);

//create a subpad with a zoom of the graphs in the main pad
c1->Update();
gr1->Draw(“lp”);
gr2->Draw(“lp”);
}[/code]

On your plot, the up and right ticks are the same as the bottom and left ones.
This is done with:

``````   c1->SetTickx(1);
c1->SetTicky(1);``````

Hi Rene,

Thank you very much. That works for me : )

Best Regards,

Jie