Help for TGraph (for dividing a canvas)

ROOT
1

Hi,

Could anyone help me to set Y-axis range for two upper graph and
another rang for two bottom graph ?

Suppose My Script is as followes.

void MChar()
{
  
  TCanvas *c1 = new TCanvas("c1","",200,10,900,700);
  // c1->SetFillColor(0);
  // gStyle->SetOptStat(0);
  c1->Divide(2,2,0,0);
  
  const Int_t n1 = 8;
  
  Double_t y1[] = {1.559,1.38,0.847,0.4337,0.219,0.090,0.0451,0.0297};
  Double_t x1[] = {356.1,304,237.1,167,113.8,74.0,45.7,26.3};
  
  TGraphErrors *gr1 = new TGraphErrors(n1,x1,y1);
   gPad->SetTickx(2);
  gr1->SetMarkerColor(1);
  gr1->SetMarkerStyle(20);
  gr1->SetMarkerSize(1);
  c1->cd(1);
  gr1->Draw("AP");
  
  const Int_t n2 = 8;
  Double_t y2[] = {3.27,4.51,6.13,8.13,10.45,13.2,16.7,19.5  };
  Double_t x2[] =  {26.3,45.7,74.0,113.8,167,237.1,304,356.1} ;
  TGraphErrors *gr2 = new TGraphErrors(n2,x2,y2);
 gPad->SetTickx(2);
  gPad->SetTicky(2);
  gr2->SetMarkerColor(4);
  gr2->SetMarkerStyle(21);
  gr2->SetMarkerSize(2);
  c1->cd(2);
  gr2->Draw("AP");
   
  const Int_t n3 = 8;
  Double_t y3[] = {0.0339,-0.009,0.001,-0.02,0.02,0.01,0.0003,-0.004 };
  Double_t x3[] ={26.3,45.7,74.0,113.8,167,237.1,304,356.1 };
  TGraphErrors *gr3 = new TGraphErrors(n3,x3,y3);
  gr3->SetMarkerColor(4);
  gr3->SetMarkerStyle(22);
  gr3->SetMarkerSize(2);
  c1->cd(3);
  gr3->Draw("AP");
  
  const Int_t n4 = 8;
  Double_t y4[] = {0.436,0.28,0.202,0.17,0.10,0.04,0.046,0.038,0.036 };
  Double_t x4[] ={ 26.3,45.7,74.0,113.8,167,237.1,304,356.1 } ;
  TGraphErrors *gr4 = new TGraphErrors(n4,x4,y4);
 gPad->SetTicky(2);
  gr4->SetMarkerColor(6);
  gr4->SetMarkerStyle(29);
  gr4->SetMarkerSize(2);
  c1->cd(4);
  gr4->Draw("AP");
  
}

regards,

2

Use gr->SetMaximum(…) and gr->SetMinimum() to set the Y ranges of the graphs

3

hi,couet

Thankx for ur reply.
Now, it works…

regards,