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Macro that opens a TBrowser and defines some functions.

myMacro.C

TBrowser a;

void myMacro(){
    std::cout << "Hello World!" << std::endl;
}

void range(TH1* hist, double xmin, double xmax)
{
    hist->GetXaxis()->SetRangeUser(xmin,xmax);
    hist->Draw();
}

double meanRange(TH1* hist, double xmin, double xmax)
{
    hist->GetXaxis()->SetRangeUser(xmin,xmax);
    return hist->GetMean(1);
}

double integrate(TH1* hist, double xmin, double xmax)
{
    hist->GetXaxis()->SetRangeUser(xmin,xmax);
    return hist->Integral();
}

void norm(TH1* hist)
{
    hist->Scale(1./hist->Integral());
    hist->Draw();
}