Problems with displaying TGraphs in different TPads

ROOT
1

Hi there,

again I have some problem with my macro.
I posted regarding the same macro a memory leack problem some months ago. Now, I have another problem:

Saving my canvas afterwards as a .ps, I always see ontop of my TCanvas in which the different TGraphs should have been drawn in the respective TPad a TGraph drawn. While running the macro this does not occure, as if before saving and afterwards closing the TCanvas the last pointer to a TGRaph is also “saved” by simply drawing it ontop of my TCanvas. Attached you can find two data files and a minimal example of the macro as well as the resulting .ps File.

Many thanks
mirror+0+2.root (1.01 MB)
AnalysePSFReflector.C (9.43 KB)
PSFinGraphs.ps (79.6 KB)
mirror+0+1.root (1.01 MB)

2

I’ll check.
FYI, your macro has a syntax error:

Processing AnalysePSFReflector.C...
Error: Too many '}' AnalysePSFReflector.C:223:

an extar “{” at the end… I am looking at your question.

3

I see that the PS and PDF files do not like what is on the screen. I guess that is what you are complaining about…

investigating …

4

I thought I could have been because of the Pad-> Divide(0. so i tried to simulate with the following macro:

{
   TCanvas *c1 = new TCanvas("c1", "c1",15,48,700,530);

   TPad *c1_1 = new TPad("c1_1", "newpad",0.07,0.1,0.7,0.9);                    
   c1_1->Draw();
   c1_1->cd();
   c1_1->Divide(10,10,0,0);   
   c1_1->cd(45);          
   hpx->Draw();
   c1->cd();

   c1_2 = new TPad("c1_2", "newpad",0.7,0.1,0.8,0.9);                        
   c1_2->Draw();
}

But the PS file is fine …
c1.ps (13.6 KB)

5

Your macro is tricky. I am trying to dismantle it to find the faulty bit.
I found that:

g0->DrawClone(“AP”);

is part of the problem. Using Draw() instead of DrawClone() makes it behaving better. But then you get 2 plots instead of one … Why DrawClone() and not simply Draw() ?

6

Ok, that’s the trick you should use Draw and not DrawClone.
I did :

        printf("%d\n",position[x][y]);
        p4->cd(position[x][y]);
        g0->Draw("AP");

and it gives me:

Processing AnalysePSFReflector.C…
128
111

so it means that two plot should be produced not one.

7

Beacuse simply using Draw() erases the TGraph from the respective TPad once the secon iteration of the loop is started. So I have to draw a clone that stays in the pad

8

Yes but with DrawClone I see only one Graph instead of two … is one graph fine ? … seems to me 2 should be displayed …

9

One Graph in each pad is hwat I need! But how do I avoid two graphs to be plot without erasing each plot during the next iteration from the previous pad?

10

What should I do to simulate this " mutli-pass" matter ?

11

later this day I will attach once more my macro of course this time without too many brackets.

12

if it is the same as before have it …

13

See how I modified your macro and see what i get.
PSFinGraphs.ps (86.9 KB)
AnalysePSFReflector.C (9.44 KB)

14

Thanks! I had doubts running out of memory doing it this way, but since I get no error this is seems to be the easiest solution.