本文整理汇总了C++中TF1::GetXmin方法的典型用法代码示例。如果您正苦于以下问题：C++ TF1::GetXmin方法的具体用法？C++ TF1::GetXmin怎么用？C++ TF1::GetXmin使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类TF1的用法示例。
在下文中一共展示了TF1::GetXmin方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: GetRandomTest
void GetRandomTest(){
double k0=1.39;
double k1 = 0.425;
double theta0 = 3.41;
double theta1 = 1.30;
int iNpart=2;
double k_=k0+k1*(iNpart-2);
double theta_=theta0+theta1*TMath::Log(iNpart-1);
TF1 *f = new TF1("f","TMath::GammaDist(x,[0],0,[1])",0,200);
f->SetParameters(k1,theta_);
cout<<"Value at 0 = "<<f->Eval(0)<<endl;
cout<<"Value at 1e-11 = "<<f->Eval(1e-11)<<endl;
cout<<"Integral 1= "<<f->Integral(f->GetXmin(),f->GetXmax())<<endl;
f->SetRange(1e-12,200);
cout<<"Integral 2= "<<f->Integral(f->GetXmin(),f->GetXmax())<<endl;
cout<<"fXmin = "<<f->GetXmin()<<"\tfXmax = "<<f->GetXmax()<<"\tfNpx = "<<f->GetNpx()<<endl;
f->SetNpx(1e5);
TCanvas *c1 = new TCanvas();
c1->SetLogy();
cout<<"f mean = "<<f->Mean(0,200)<<endl;
cout<<"math mean = "<<f->GetParameter(0)*f->GetParameter(1)<<endl;
TH1D* h = new TH1D("h","h",1000,0,200);
for(int i=0;i<1e6;i++){
double para = f->GetRandom();
h->Fill(para);
}
h->Scale(1.0/h->Integral()*1000/200);
h->GetYaxis()->SetRangeUser(1e-10,1);
h->SetMarkerStyle(24);
h->SetMarkerColor(4);
h->SetMarkerSize(1.1);
TLegend *leg = new TLegend(0.6,0.7,0.8,0.9);
leg->SetFillColor(0);
leg->SetFillStyle(0);
leg->SetBorderSize(0);
leg->SetTextFont(42);
leg->SetTextSize(0.03);
leg->AddEntry(f,"function","lp");
leg->AddEntry(h,"filled histogram","lp");
h->Draw("P");
f->Draw("same");
leg->Draw("same");
cout<<"h mean = "<<h->GetMean(1)<<endl;
c1->Print("TestGetRandom.png");
}示例2: showFunctions1d
void showFunctions1d(std::vector<TF1*>& functions, const std::vector<std::string>& legendEntries,
const TString& xAxisTitle, double yMin, double yMax, const TString& yAxisTitle,
const std::string& outputFileName)
{
assert(functions.size() == legendEntries.size());
TCanvas* canvas = new TCanvas("canvas", "canvas", 800, 600);
canvas->SetFillColor(10);
canvas->SetBorderSize(2);
canvas->SetLeftMargin(0.12);
canvas->SetBottomMargin(0.12);
assert(functions.size() > 0);
TF1* refFunction = functions[0];
TH1* dummyHistogram = new TH1F("dummyHistogram", "dummyHistogram", 10, refFunction->GetXmin(), refFunction->GetXmax());
dummyHistogram->SetStats(false);
dummyHistogram->SetTitle("");
dummyHistogram->SetMinimum(-TMath::Log(yMax));
dummyHistogram->SetMaximum(-TMath::Log(yMax) + 5.);
TAxis* xAxis = dummyHistogram->GetXaxis();
xAxis->SetTitle(xAxisTitle.Data());
xAxis->SetTitleOffset(1.15);
TAxis* yAxis = dummyHistogram->GetYaxis();
yAxis->SetTitle(Form("-log(%s)", yAxisTitle.Data()));
yAxis->SetTitleOffset(1.30);
dummyHistogram->Draw("axis");
int colors[] = { 1, 2, 3, 4, 5, 6, 7, 15 };
int numFunctions = functions.size();
if ( numFunctions > 8 ) {
std::cerr << "<showFunctions1d>:" << std::endl;
std::cerr << "Number of functions must not exceed 8 !!" << std::endl;
assert(0);
}
for ( int iFunction = 0; iFunction < numFunctions; ++iFunction ) {
TF1* function = functions[iFunction];
function->SetLineColor(colors[iFunction]);
function->SetLineWidth(2);
function->Draw("same");
}
TLegend* legend = new TLegend(0.68, 0.89 - (0.03 + 0.040*numFunctions), 0.89, 0.89, "", "brNDC");
legend->SetBorderSize(0);
legend->SetFillColor(0);
legend->SetTextSize(0.035);
for ( int iFunction = 0; iFunction < numFunctions; ++iFunction ) {
TF1* function = functions[iFunction];
const std::string& legendEntry = legendEntries[iFunction];
legend->AddEntry(function, legendEntry.data(), "l");
}
legend->Draw();
canvas->Update();
size_t idx = outputFileName.find_last_of('.');
std::string outputFileName_plot = std::string(outputFileName, 0, idx);
if ( idx != std::string::npos ) canvas->Print(std::string(outputFileName_plot).append(std::string(outputFileName, idx)).data());
canvas->Print(std::string(outputFileName_plot).append(".png").data());
canvas->Print(std::string(outputFileName_plot).append(".pdf").data());
delete dummyHistogram;
delete legend;
delete canvas;
}