Revision b58d19250d16964d05d90a64fc5c67d76d95f829 authored by Lorenzo Moneta on 06 February 2014, 10:35:39 UTC, committed by Lorenzo Moneta on 06 February 2014, 10:49:24 UTC
1 parent 448440d
fit1.C
void fit1() {
//Simple fitting example (1-d histogram with an interpreted function)
//To see the output of this macro, click begin_html <a href="gif/fit1.gif">here</a>. end_html
//Author: Rene Brun
TCanvas *c1 = new TCanvas("c1_fit1","The Fit Canvas",200,10,700,500);
c1->SetGridx();
c1->SetGridy();
c1->GetFrame()->SetFillColor(21);
c1->GetFrame()->SetBorderMode(-1);
c1->GetFrame()->SetBorderSize(5);
gBenchmark->Start("fit1");
//
// We connect the ROOT file generated in a previous tutorial
// (see begin_html <a href="fillrandom.C.html">Filling histograms with random numbers from a function</a>) end_html
//
TString dir = gSystem->UnixPathName(gInterpreter->GetCurrentMacroName());
dir.ReplaceAll("fit1.C","");
dir.ReplaceAll("/./","/");
TFile *fill = TFile::Open("fillrandom.root");
if (!fill) {
gROOT->ProcessLine(Form(".x %s../hist/fillrandom.C",dir.Data()));
fill = TFile::Open("fillrandom.root");
if (!fill) return;
}
//
// The function "ls()" lists the directory contents of this file
//
fill->ls();
//
// Get object "sqroot" from the file. Undefined objects are searched
// for using gROOT->FindObject("xxx"), e.g.:
// TF1 *sqroot = (TF1*) gROOT.FindObject("sqroot")
//
sqroot->Print();
//
// Now fit histogram h1f with the function sqroot
//
h1f->SetFillColor(45);
h1f->Fit("sqroot");
// We now annotate the picture by creating a PaveText object
// and displaying the list of commands in this macro
//
auto fitlabel = new TPaveText(0.6,0.3,0.9,0.80,"NDC");
fitlabel->SetTextAlign(12);
fitlabel->SetFillColor(42);
fitlabel->ReadFile(Form("%sfit1_C.C",dir.Data()));
fitlabel->Draw();
c1->Update();
gBenchmark->Show("fit1");
}
![swh spinner](/static/img/swh-spinner.gif)
Computing file changes ...