Set LogY Scale in case we have Data/Mc

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1

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meeeee.pdf (14.7 KB)

Hi,

I want to Set logy scale for my Data/MC comparaison histogram, but when i do that i can only see Data and MC vanish . when i go back to the normal scale i can see both data and MC.

can anyone tell why i can’t see MC distribution when set logy scale ?

2

To understand what’s going on we will need a small reproducer macro.

3

at least you should show the same with linear Y-scale.
I guess your MC data are all below 0.1
Otto

4

Thanks for reply.

TCanvas *c2 = new TCanvas("c2","MET Data/MC(Weight) ID{1,5} |eta|< 2.4 mupt > 50 Gev  ",1900, 1600);


 //Histogram Normalieation 
Double_t norm = h0->Integral();
Double_t scale = norm/(h1->Integral());
h1->Scale(scale);


HistoStyle (h1, 8, 3001);
h0-> SetMarkerStyle(8);


THStack *a = new THStack ("a", "MET Data/MC(Weight) ID{1,5} |eta|< 2.4 mupt > 50 Gev ;#slash{E}_{T}(GeV); Numbre of events");
  
a->Add(h1, "HIST");
a->Add(h0, "PLC PMC");
a->Draw("nostack");

So if MC is below 0.1 How can i change logy scale ?

Th

Log_Scal.pdf (110.4 KB)

5

my guess was wrong, your MC and data have
similar y values (no surprise after Scale(…))
You must provide the complete macro producing
the stack.
Btw. you still dont show the plot with linear Y-scale.

Otto

6

Yes, You will find closed the complete macro.

Thank you very much. Wmet5.C (10.0 KB)

7

Hi.
your macro looks different now:

        HistoStyle (h1, 8, 3001);
        h0-> SetMarkerStyle(8);

        /*
        THStack *a = new THStack ("a", "MET Data/MC(Weight) ID{1,5} |eta|< 2.4 mupt > 50 Gev ;#slash{E}_{T}(GeV); Numbre of events");
          
        a->Add(h1, "HIST");
        a->Add(h0, "PLC PMC");
        a->Draw("nostack");
        */

        h1->Draw ("SAME"); 
        h0->Draw ("ALP");

The part with THStack is commented out,
instead you draw the histos directly.
However the order is wrong:
You first draw with option SAME then with ALP.
It should be the other way round.

Otto

8

Note that “A” is not needed (ALP is usually a TGraph option). try:

    h0->Draw ("LP"); 
    h1->Draw ("SAME");
9

Hi,

I did that but i still get only Data and MC vanish.

Cheers,

10

Your macro uses two files we do not have.
Can you post them (or a subset of them) ?

11

Hi,

Sorry for being late, i have tired to fixed the problem and i find what’s caused the problem.
I have just change SetMinimum(0) to SetMinimum(1) and it worked.

Thank you very much.
Cheers