Unknown type name 'TGraphMultiErrors'

ROOT
1

Hello everyone,
I am using TGraphMultiErrors to plot stat. and sys,but I found it doesn’t work.
I run a example exactly followed manual.

{
   auto c1 = new TCanvas("c1", "A Simple Graph with multiple y-errors", 200, 10, 700, 500);
   c1->SetGrid();
   c1->GetFrame()->SetBorderSize(12);
   const Int_t np = 5;
   Double_t x[np]       = {0, 1, 2, 3, 4};
   Double_t y[np]       = {0, 2, 4, 1, 3};
   Double_t exl[np]     = {0.3, 0.3, 0.3, 0.3, 0.3};
   Double_t exh[np]     = {0.3, 0.3, 0.3, 0.3, 0.3};
   Double_t eylstat[np] = {1, 0.5, 1, 0.5, 1};
   Double_t eyhstat[np] = {0.5, 1, 0.5, 1, 2};
   Double_t eylsys[np]  = {0.5, 0.4, 0.8, 0.3, 1.2};
   Double_t eyhsys[np]  = {0.6, 0.7, 0.6, 0.4, 0.8};
   auto gme = new TGraphMultiErrors("gme", "TGraphMultiErrors Example", np, x, y, exl, exh, eylstat, eyhstat);
   gme->AddYError(np, eylsys, eyhsys);
   gme->SetMarkerStyle(20);
   gme->SetLineColor(kRed);
   gme->GetAttLine(0)->SetLineColor(kRed);
   gme->GetAttLine(1)->SetLineColor(kBlue);
   gme->GetAttFill(1)->SetFillStyle(0);
   gme->Draw("APS ; Z ; 5 s=0.5");
}

The results show:

error:unknown type name 'TGraphMultiErrors'**

Any comment and suggestion is appreciated.

Best wishes
Yao

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2

Currently, I add the class TGraphMultiErrors.cxx and head file TGraphMultiErrors.h in my function. The function is no error. But the plot only show one marker, no stat line and no systematic line.

3

The example works fine on ROOT 6.22. Maybe your version is too old; this graph was implemented sometime last year (see this), so try with the latest version.

4

Nice. Thanks a lot. The problem indeed comes from the old version. I run the macro using the latest root 6.22 version again, and the it works perfect.

Cheers.
Yao

5

@dastudillo,
Hi dastudillo,
Do you know how to add “same” option to TGraphMultiErrors
Just like ->Draw(“Psame”);
insert into:
gme->Draw("APS ; Z ; 5 s=0.5");
Because I had set a proper x, y range and other plots.

Cheers
Yao

6

Just don’t draw the axes again (remove A):

gme->Draw("PS same ; Z ; 5 s=0.5");

it also works without adding “same” but doesn’t hurt to put it.

7

@dastudillo
Perfect. Thanks a lot. I am appreciated for your patient.
In addition, could I change the current option to have a fixed width of systematic box, just like below, and have a statistical range (now just including a line, not haveing the short horizontal line)
image

8

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