Get all floting number v2

[calbet]

Dear experts,

I set () in my rootrc file, I also tried () directly from the prompt as advice here () but I still have
2.03997e+07 instead of 20399700. Do you know what is missing? I have root 6.8.

(*) Canvas.SavePrecision 16

(**)
gEnv->GetValue(“Canvas.SavePrecision”, -1)
gEnv->SetValue(“Canvas.SavePrecision”, 16)

(***)

Large numbers on x-axis and problems loosing precision

Dear ROOT-forumers I have a problem trying to use the TTimeStamp for the x-axis of my histogram. It seems to me that the problem is that the precision is lost. I typically make the x-axis from a 9-digit number that I get from the GetSec() method of TTimeStamp, making this into a float, and defining a histogram using these floats as the x-axis bin-values (I need to use floats, so that the values of the histogram and the values on the x-axis both are floats, I have understood must be required). A…

[couet]

Can you provide a small script showing the problem ?

[calbet]

Dear Couet,

you can see the root file here (*):

If you do (**), you’ll see that you do not have all the floating.

Regards

(*) http://calpas.web.cern.ch/calpas/run_00311071.root
http://calpas.web.cern.ch/calpas/run_00311071.root

(**)
root [1] _file0->cd(“mm”)

root [1] cutflow->GetBinContent(1)

(Double_t) 3.32235e+06

[Wile_E_Coyote]

TF1 GetParameter : accuracy is limited

[code]// … #include #include // … std::cout << std::setprecision(17) << "Parameter(2) is " << fitFcn->GetParameter(2) << std::endl; std::cout << std::setprecision(7) << "Parameter(2) is " << fitFcn->GetParameter(2) << std::endl; // …[/code]

ROOT rounds to Integers

root [0] std::cout << 10./3. << std::endl; 3.33333 root [1] std::cout.precision(16); root [2] std::cout << 10./3. << std::endl; 3.333333333333333 root [3] std::cout << std::setprecision(10) << 10./3. << std::endl; 3.333333333 See the std::ios_base::precision and std::setprecision descriptions.

[calbet]

Dear Coyote,

sorry but this does not work on my root file

http://calpas.web.cern.ch/calpas/ run_00311071.root
http://calpas.web.cern.ch/calpas/run_00311071.root

I have root 6.8.

Regards

[Wile_E_Coyote]

root […] cutflow->GetBinContent(1) - 3.32235e+06

[couet]

$ root run_00311071.root
   -----------------------------------------------------------------
  | Welcome to ROOT 6.11/01                     http://root.cern.ch |
  |                                    (c) 1995-2017, The ROOT Team |
  | Built for macosx64                                              |
  | From heads/master@v6-09-02-1630-gc4978f1, Jul 11 2017, 09:00:23 |
  | Try '.help', '.demo', '.license', '.credits', '.quit'/'.q'      |
   -----------------------------------------------------------------

root [1] _file0->cd("mm")
root [2] cutflow->GetBinContent(1)
(double) 3322350.000000
root [3] cout << cutflow->GetBinContent(1) << endl;
3.32235e+06
root [4] printf("%g\n",cutflow->GetBinContent(1))
3.32235e+06
root [5] printf("%f\n",cutflow->GetBinContent(1))
3322350.000000

[calbet]

Dear Coyote,

sorry, what do you mean? Do know how I can do what I want?

Regards

[calbet]

Dear Couet,

thank you.

|printf("%f\n",cutflow->GetBinContent(1))|

works for me.

Regards

[couet]

note that with 6.11 you get what you want doing:

root [2] cutflow->GetBinContent(1)
(double) 3322350.000000

[calbet]

Dear Couet,

Ok. Thank you.

Regards