Can't put TPaveStats box on a histogram

[Mai]

Hi,

I have a root file which is the output of an ntuple code maker and when i tried to plot any histogram the TPaveStats box is not created.

I tried:

gStyle->SetOptStat(“e”);

and many similar commands but i fail.

could you please help.

thanks,

Mai

[couet]

By default you should have the stat box. May be this particular histogram does not have stat box. In that case do:

 h->SetStats(kTRUE);

where h is your histogram.

[bellenot]

This is weird, it should be on by default (see TH1::SetStats(Bool_t stats = kTRUE)) Could you give more details about how you generate the histogram?

[Mai]

The weird thing now that when i type

h->SetStats(kTRUE);

I got a small box with only number of entries equal to 0 , but how come and i see a plot

[bellenot]

Try to play with the TStyle::SetOptStat(Option_t * stat) options

[Wile_E_Coyote]

To me, this plot looks like “an unbinned 2-d scatter-plot (TGraph)”.

[couet]

We would need a small code example to help you further.

[Mai]

Hi ,

I just draw this plot in the interactive root session , like

monopoles->Draw(“Track_SatSubHits/Track_SubHits:Track_SubHits”)

which monopoles is the TTree name in a root file which is the output of Ntuple producing process.

Maybe i will try to make a small macro to draw this plot and check if the box will appear or not.

thanks,

Mai

[Mai]

but for example one of the variable i am drawing in the TBrowser it has the box

[Wile_E_Coyote]

monopoles->Draw(“Track_SatSubHits/Track_SubHits:Track_SubHits >> MyHisto”); // due to some bug, it does not display the statistics box …
MyHisto->Draw(); // … so you need to draw it manually

[Mai]

And now it works
Many thanks

[couet]

monopoles->Draw("Track_SatSubHits/Track_SubHits:Track_SubHits >> MyHisto");

Generates a scatter plot ((x,y) dots). To be sure you will plot the filled histogram specify an histogram plotting option.

monopoles->Draw("Track_SatSubHits/Track_SubHits:Track_SubHits >> MyHisto", "","COL");

or

monopoles->Draw("Track_SatSubHits/Track_SubHits:Track_SubHits >> MyHisto", "","SCAT");

The two steps @Wile_E_Coyote mentioned before would be better with option GOFF

monopoles->Draw("Track_SatSubHits/Track_SubHits:Track_SubHits >> MyHisto", "","goff");
MyHisto->Draw(); 

[Wile_E_Coyote]

Note that if you execute the monopoles->Draw("… >> MyHisto") command two times or more (in a row), starting with the second pass, it will draw the statistics box (without any need for an additional “drawing option”).

[couet]

@Wile_E_Coyote

Note that if you execute the monopoles->Draw(“… >> MyHisto”) command two times or more (in a row), starting with the second pass, it will draw the statistics box (without any need for an additional “drawing option”).

Yes because at the 2nd execution the histogram already created. I works also without drawing option if you create the histogram before doing TTree::Draw.

root [0] TH2F *h2 = new TH2F("h2","h2",10,-10,10,10,-10,10)
root [1] ntuple->Draw("px:py>>h2")

[spacestationspaz]

tree->Draw(“Branch1:Branch2>> MyHisto”, “”,“SCAT”)
MyHisto->Draw()

worked for me, but how do I pipe the bin info in that case? I would usually do:

tree->Draw(“Branch1:Branch2>>(ybinx,ymin,ymax, xbins,xmin,xmax)”)

[Wile_E_Coyote]

tree->Draw(“Branch1:Branch2 >> MyHIsto(ybinx,ymin,ymax, xbins,xmin,xmax)”)

[spacestationspaz]

Thanks! I tried

tree->Draw(“Branch1:Branch2 >> (ybinx,ymin,ymax, xbins,xmin,xmax)MyHisto”)

and it didn’t work so I gave up. Silly me.