gerrors2

Draw two graphs with error bars

Author: Rene Brun
This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Tuesday, November 29, 2022 at 11:16 AM.

In [1]:
TCanvas *c1 = new TCanvas("c1","gerrors2",200,10,700,500);
c1->SetGrid();

draw a frame to define the range

In [2]:
TH1F *hr = c1->DrawFrame(-0.4,0,1.2,12);
hr->SetXTitle("X title");
hr->SetYTitle("Y title");
c1->GetFrame()->SetBorderSize(12);

create first graph

In [3]:
const Int_t n1 = 10;
Double_t xval1[]  = {-0.22, 0.05, 0.25, 0.35, 0.5, 0.61,0.7,0.85,0.89,0.95};
Double_t yval1[]  = {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,xval1,yval1,ex1,ey1);
gr1->SetMarkerColor(kBlue);
gr1->SetMarkerStyle(21);
gr1->Draw("LP");

create second graph

In [4]:
const Int_t n2 = 10;
Float_t xval2[]  = {-0.28, 0.005, 0.19, 0.29, 0.45, 0.56,0.65,0.80,0.90,1.01};
Float_t yval2[]  = {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,xval2,yval2,ex2,ey2);
gr2->SetMarkerColor(kRed);
gr2->SetMarkerStyle(20);
gr2->Draw("LP");

Draw all canvases

In [5]:
%jsroot on
gROOT->GetListOfCanvases()->Draw()