doc/v606/spider_8C.html

#include "TFile.h"

#include "TCanvas.h"

#include "TNtuple.h"

#include "TSpider.h"


void spider() {

   TCanvas *c1 = new TCanvas("c1","TSpider example",200,10,700,700);

   TFile *f = new TFile("hsimple.root");

   if (!f || f->IsZombie()) {

      printf("Please run <ROOT location>/tutorials/hsimple.C before.");

      return;

   }

   TNtuple* ntuple = (TNtuple*)f->Get("ntuple");

   TString varexp = "px:py:pz:random:sin(px):log(px/py):log(pz)";

   TString select = "px>0 && py>0 && pz>0";

   TString options = "average";

   TSpider *spider = new TSpider(ntuple,varexp.Data(),select.Data(),options.Data());

   spider->Draw();

   c1->ToggleEditor();

   c1->Selected(c1,spider,1);

}