graph->Draw("AP") ; func->Draw("SAME")

ROOT
1

Dear ROOTERS,

what do I have to do to draw correctly the TF1 and the TGraphErrors in the test.root file… ?

void mytest() {
    TFile f("test.root") ;
    TF1 *func = (TF1*) f.Get("func;1") ;
    TGraphErrors *graph = (TGraphErrors*) f.Get("Graph;1") ;

    graph->Draw("AP") ;
    func->Draw("SAME") ;
}

there is a bug in the upper left corner
I dont know what to redraw (frame, axis, in a transparent way ?) , do GetHistogram->SetSomething, ??

btw, the bug is still visible in the latex version with a gPad->Print(“test.tex”)

Thanks
test.root (6.39 KB)

2

What do you mean ? your macro gives something which looks fine. i.e.:

  1. a set of error bars produced by TGraphErrors
  2. a function drawn as a line produce by TF1.

what do you think in not correct ??
…

3

No there is a bug… the cuve has a strange angular singularity next to the upper horyzontal axis

  • in canvas.pdf
  • in latexcanvas.pdf

I want to redraw the frame so :

4 
void mytest() {
    TFile f("test.root") ;
    TF1 *func = (TF1*) f.Get("func;1") ;
    TGraphErrors *graph = (TGraphErrors*) f.Get("Graph;1") ;

    graph->Draw("AP") ;
    func->Draw("SAME") ;
    func->GetXaxis()->SetRange(6,100);
}
5

So it’s a bug ?.. (and sometimes the angular point is much much bigger, with “test.root” I just provided a way to reproduce the “bug”)

Your solution works but I can’t do that on a “case by case basis”.

I want to redraw the frame so :

    1. no more bug in the curve
      -2) recover original black border from the frame
  1. I cant’do something like :
    double coef = 1.05 ;
    graph->GetXaxis()->SetLimits(coef * graph->GetXaxis()->GetXmin(),coef * graph->GetXaxis()->GetXmax()) ;
    graph->GetHistogram()->SetMinimum(coef * graph->GetHistogram()->GetMinimum()) ;
    graph->GetHistogram()->SetMaximum(coef * graph->GetHistogram()->GetMaximum()) ;

it’s not going to work in the long term, it’s artificial and ugly

6

or:

void mytest() {
    TFile f("test.root") ;
    TF1 *func = (TF1*) f.Get("func;1") ;
    TGraphErrors *graph = (TGraphErrors*) f.Get("Graph;1") ;

    graph->Draw("AP") ;
    func->Draw("SAME") ;
    func->SetNpx(2000);
}
7

Thanks for this new solution,

it’s much better

but I still would like to redraw the upper horizontal axis so the red would not be on top of the original black axis…
latexcanvas.pdf (33.4 KB)
canvas.pdf (27 KB)

8

There is an “How To” on that exact question:

root.cern.ch/drupal/content/how- … ot-borders

9

Thanks for your help.
I had to add a func->SetLineWidth(0) otherwise the result in the latex is not good. (redrawBorder works but TF1 finish above the redrawn axis…)

void redrawBorder()
{
   gPad->Update();
   gPad->RedrawAxis();
   TLine l;
   l.DrawLine(gPad->GetUxmin(), gPad->GetUymax(), gPad->GetUxmax(), gPad->GetUymax());
   l.DrawLine(gPad->GetUxmax(), gPad->GetUymin(), gPad->GetUxmax(), gPad->GetUymax());
}

void mytest() {
    TFile f("test.root") ;
    func = (TF1*) f.Get("func;1") ;
    graph = (TGraphErrors*) f.Get("Graph;1") ;
    graph->Draw("AP") ;
    func->Draw("SAME") ;
    func->SetNpx(2000) ;
    func->SetLineWidth(0) ;
    redrawBorder() ;
}

Any advice to improve the smoothness of the curve in the latex version ?
func->SetNpx(10000) ; does not help
latexcanvas.pdf (94.1 KB)
canvas.pdf (73.2 KB)

10

I am looking at it now on my screen … how it can smoother than what I am seeing ? ( see my screen dump)

Screen Shot 2014-12-04 at 17.05.19.png1572×1111 53.4 KB

11

Ok
your latex was better than mind… I figure out the problem…it was my pdf viewer (Evince)

I just downloaded Okular and the curve is smooth…

Thanks

okular.png1920×1080 36.1 KB


evince.png1920×1080 44 KB

12

THE Reference in the pdf viewers’ field is Adobe Acrobat.