Fill a 1-D histogram from a parametric function.
auto pad1 =
new TPad(
"pad1",
"The pad with the function",0.05,0.50,0.95,0.95);
auto pad2 =
new TPad(
"pad2",
"The pad with the histogram",0.05,0.05,0.95,0.45);
pad1->Draw();
pad2->Draw();
pad1->cd();
auto form1 =
new TFormula(
"form1",
"abs(sin(x)/x)");
auto sqroot =
new TF1(
"sqroot",
"x*gaus(0) + [3]*form1",0,10);
sqroot->SetParameters(10,4,1,20);
pad1->SetGridx();
pad1->SetGridy();
pad1->GetFrame()->SetBorderMode(-1);
pad1->GetFrame()->SetBorderSize(5);
sqroot->SetLineColor(4);
sqroot->SetLineWidth(6);
sqroot->Draw();
auto lfunction =
new TPaveLabel(5,39,9.8,46,
"The sqroot function");
lfunction->Draw();
pad2->cd();
pad2->GetFrame()->SetBorderMode(-1);
pad2->GetFrame()->SetBorderSize(5);
auto h1f =
new TH1F(
"h1f",
"Test random numbers",200,0,10);
h1f->SetFillColor(45);
h1f->FillRandom("sqroot",10000);
h1f->Draw();
TFile myfile(
"fillrandom.root",
"RECREATE");
form1->Write();
sqroot->Write();
h1f->Write();
}
R__EXTERN TBenchmark * gBenchmark
virtual void Start(const char *name)
Starts Benchmark with the specified name.
virtual void Show(const char *name)
Stops Benchmark name and Prints results.
A ROOT file is a suite of consecutive data records (TKey instances) with a well defined format.
1-D histogram with a float per channel (see TH1 documentation)}
The most important graphics class in the ROOT system.
A Pave (see TPave) with a text centered in the Pave.
- Author
- Rene Brun
Definition in file fillrandom.C.