swh:1:snp:af87cd67498ef4fe47c76ed3e7caffe5b61facaf
Tip revision: 78dc71f2471d7b5c4d0c6d63d241823d15b10db8 authored by Axel Naumann on 04 November 2016, 14:01:48 UTC
Update release date.
Update release date.
Tip revision: 78dc71f
graphApply.C
/// \file
/// \ingroup tutorial_graphs
/// \notebook
/// A macro to demonstrate the functionality of TGraph::Apply() method.
/// TGraph::Apply applies a function `f` to all the data TGraph points.
/// `f` may be a 1-D function TF1 or 2-d function TF2.
/// The Y values of the graph are replaced by the new values computed using
/// the function.
///
/// \macro_image
/// \macro_code
///
/// \author Miro Helbich
void graphApply()
{
const Int_t npoints=3;
Double_t xaxis[npoints] = {1.,2.,3.};
Double_t yaxis[npoints] = {10.,20.,30.};
Double_t errorx[npoints] = {0.5,0.5,0.5};
Double_t errory[npoints] = {5.,5.,5.};
Double_t exl[npoints] = {0.5,0.5,0.5};
Double_t exh[npoints] = {0.5,0.5,0.5};
Double_t eyl[npoints] = {5.,5.,5.};
Double_t eyh[npoints] = {5.,5.,5.};
TGraph *gr1 = new TGraph(npoints,xaxis,yaxis);
TGraphErrors *gr2 = new TGraphErrors(npoints,xaxis,yaxis,errorx,errory);
TGraphAsymmErrors *gr3 = new TGraphAsymmErrors(npoints,xaxis,yaxis,exl,exh,eyl,eyh);
TF2 *ff = new TF2("ff","-1./y");
TCanvas *c1 = new TCanvas("c1","c1");
c1->Divide(2,3);
// TGraph
c1->cd(1);
gr1->DrawClone("A*");
c1->cd(2);
gr1->Apply(ff);
gr1->Draw("A*");
// TGraphErrors
c1->cd(3);
gr2->DrawClone("A*");
c1->cd(4);
gr2->Apply(ff);
gr2->Draw("A*");
// TGraphAsymmErrors
c1->cd(5);
gr3->DrawClone("A*");
c1->cd(6);
gr3->Apply(ff);
gr3->Draw("A*");
}