How to Work in Root Working with Histograms
Creating a histogram: TH1F *hist1 = new TH1F("name","title",bins, min_x,max_x);
Filling and Drawing a histogram: hist1->Fill(value1); hist1->Draw();
Drawing a function: TF1 *fun1 = new TF1("MySine","sin(x*10)",-0.2,0.3); fun1->Draw();