Draw of TNtuple

From: Markus Weiss (weiss@bessy.de)
Date: Thu Mar 18 1999 - 10:00:28 MET 

Hi,

I wrote a little routine to display data which  is organized
as approx. 50000 lines of "x y z". When I try to draw these
with e.g. option "surf3"  only a subrange of y is shown.

Thanks for any help.

Markus.



The code follows:

gROOT->Reset();

void show() {
  c1 = new TCanvas("c1","The Ntuple canvas",200,10,700,780); 

  Double_t xin, yin, zin;
  int ncols, nlines;

  FILE *fp = fopen("s160399.mit","r");

  if (fp <= 0) printf("Sorry, cannot open file test.dat\n");

  data = new TNtuple("data","data","px:py:pz"); 

  while (1) {
     ncols = fscanf(fp, "%lf %lf %lf", &xin, &yin, &zin);
     if (ncols<0) break;
     data->Fill(xin,yin,zin);
     nlines++;
   }
   fclose(fp);

   printf(" found %d points\n",nlines);

   data->Draw("px:py","pz","surf3");

   c1->Update();
}



--
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Markus Weiss                                  "Ah elbereth glithoniel
BESSY-2 Projektteam                            silvren penna miriel"
e-mail: weiss@abbe.exp.bessy.de               phone: +49-30-6392-2941
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