Logo ROOT   6.08/07
Reference Guide
formula1.C
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1 /// \file
2 /// \ingroup tutorial_graphics
3 /// \notebook -js
4 /// Display interpreted functions.
5 ///
6 /// \macro_image
7 /// \macro_code
8 ///
9 /// \author Rene Brun
10 
11 void formula1() {
12  TCanvas *c1 = new TCanvas("c1","Example with Formula",200,10,700,500);
13  //
14  // We create a formula object and compute the value of this formula
15  // for two different values of the x variable.
16  //
17  auto form1 = new TFormula("form1","sqrt(abs(x))");
18  form1->Eval(2);
19  form1->Eval(-45);
20  //
21  // Create a one dimensional function and draw it
22  //
23  auto fun1 = new TF1("fun1","abs(sin(x)/x)",0,10);
24  c1->SetGridx();
25  c1->SetGridy();
26  fun1->Draw();
27  c1->Update();
28  //
29  // Before leaving this demo, we print the list of objects known to ROOT
30  //
32 }
virtual void SetGridx(Int_t value=1)
Definition: TPad.h:319
return c1
Definition: legend1.C:41
The F O R M U L A class.
Definition: TFormula.h:89
R__EXTERN TObjectTable * gObjectTable
Definition: TObjectTable.h:84
The Canvas class.
Definition: TCanvas.h:41
virtual void SetGridy(Int_t value=1)
Definition: TPad.h:320
1-Dim function class
Definition: TF1.h:149
virtual void Update()
Update canvas pad buffers.
Definition: TCanvas.cxx:2183
void Print(Option_t *option="") const
Print the object table.