Write the covariance and the correlation value on a graphic

ROOT
1

Hi all,
I wrote a little program that generate random numbers and I calculated the covariance and the correlation factor, I compare my values with those calculated by ROOT.
How do I write all these values on the graphic?
Thank you
Ciccio

2

use a TPaveText object. See examples in tutorials

Rene

3

Hi,
can I use TPaveText also if I want to print a variable calculated in the program?
If yes, how do I it?
Thank you
Ciccio

4

see example (and also read the tutorials).

Rene

{ TH1F *h = new TH1F("h","test",100,-3,3); h->FillRandom("gaus",10000); TCanvas *c1 = new TCanvas("c1"); h->Draw(); TPaveText *pt = new TPaveText(0.15,0.7,0.30,0.85,"brNDC"); char text[100]; sprintf(text,"mean=%g",h->GetMean()); pt->AddText(text); sprintf(text,"rms=%g",h->GetRMS()); pt->AddText(text); pt->Draw(); }

5

Thank you very much.
Ciccio