Create the canvas on which we'll draw the graph.
TCanvas c;
c.SetGrid();
Create the graph of expected points by reading from an ASCII file.
.! curl https://raw.githubusercontent.com/root-mirror/training/master/2016/macro2_input_expected.txt -o macro2_input_expected.txt
% Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 221 100 221 0 0 774 0 --:--:-- --:--:-- --:--:-- 775
TGraphErrors graph_expected("./macro2_input_expected.txt", "%lg %lg %lg");
graph_expected.SetTitle(
"Measurement XYZ and Expectation;"
"lenght [cm];"
"Arb.Units");
graph_expected.SetFillColor(kYellow);
graph_expected.Draw("E3AL"); // E3 draws the band
Create the graph of measured points, also reading from a file.
TGraphErrors graph("../macro2_input.txt", "%lg %lg %lg");
graph.SetMarkerStyle(kCircle);
graph.SetFillColor(0);
graph.Draw("PESame");
Draw the legend.
TLegend leg(.1, .7, .3, .9, "Lab. Lesson 2");
leg.SetFillColor(0);
leg.AddEntry(&graph_expected, "Expected Points");
leg.AddEntry(&graph, "Measured Points");
leg.Draw("Same");
Display in the notebook what is in our canvas as interactive javascript graphics.
%jsroot on
c.Draw();
Print graph and error values.
graph.Print();
x[0]=1, y[0]=6, ex[0]=0, ey[0]=5 x[1]=2, y[1]=12, ex[1]=0, ey[1]=5 x[2]=3, y[2]=14, ex[2]=0, ey[2]=4.7 x[3]=4, y[3]=20, ex[3]=0, ey[3]=4.5 x[4]=5, y[4]=22, ex[4]=0, ey[4]=4.2 x[5]=6, y[5]=24, ex[5]=0, ey[5]=5.1 x[6]=7, y[6]=35, ex[6]=0, ey[6]=2.9 x[7]=8, y[7]=45, ex[7]=0, ey[7]=4.1 x[8]=9, y[8]=44, ex[8]=0, ey[8]=4.8 x[9]=10, y[9]=53, ex[9]=0, ey[9]=5.43