Re: How to catch Fit results manually

Thanks Arthur!
I got your point. So, parameter 1 is the Mean Value and parameter 2 is the Sigma but still i don't understand how to get errors on these. Can you please point out something about errors?

Cheers, Asif

On Wed, Feb 29, 2012 at 5:24 PM, Arthur E. Snyder <snyder_at_slac.stanford.edu>wrote:

> Assuming your fitting a TF1 to a histogram see
>
> http://root.cern.ch/root/html/**TF1.html<http://root.cern.ch/root/html/TF1.html>
>
> and (for inherited functions)
>
> http://root.cern.ch/root/html/**TFormula.html<http://root.cern.ch/root/html/TFormula.html>
>
> -Art S
>
> A.E. Snyder, The Former Group C (TFC) \!c*p?/
> SLAC Mail Stop #95 ((. .))
> Box 4349 |
> Stanford, Ca, USA, 94309 '\|/`
> e-mail:snyder_at_slac.stanford.**edu <e-mail%3Asnyder_at_slac.stanford.edu>
> o
> phone:650-926-2701 _
> http://www.slac.stanford.edu/~**snyder<http://www.slac.stanford.edu/%7Esnyder> BaBar
> FAX:707-313-0250 Collaboration
> &
> Fermi/GLAST
>
>
>
>
> On Wed, 29 Feb 2012, Asif Saddique wrote:
>
> Hi rooters,
>>
>> I am fitting a Gaussian on TH1D and I see following values of Mean & Sigma
>> in my terminal:
>> ==============================**=============================
>> FCN=86.9094 FROM MIGRAD STATUS=CONVERGED 63 CALLS 64
>> TOTAL
>> EDM=2.49833e-09 STRATEGY= 1 ERROR MATRIX
>> ACCURATE
>> EXT PARAMETER ** STEP FIRST
>> NO. NAME VALUE ERROR SIZE DERIVATIVE
>> 1 Constant 5.98744e+03 4.61314e+01 1.65706e-01 -1.72560e-06
>> 2 Mean 9.20998e+01 1.10379e-01 5.04750e-04 -4.60640e-05
>> 3 Sigma 1.82326e+01 8.71316e-02 5.68693e-06 -5.16419e-02
>> ==============================**==============================
>>
>> I can see Mean & Sigma from here but how can get them manually. Actually,
>> i
>> want to print them in the title of my Histogram. I will convert the value
>> into TString then i will put it in the title but how I can get these
>> values,
>> I mean
>>
>>
>> cout<<"Mean Value= "<<????<<<" with Error ="<<????<<endl;
>> cout<<"Sigma Value= "<<????<<" with Error ="<<????<<endl;
>>
>> should output following:
>>
>> Mean Value= 9.20998e+01 with Error =4.61314e+01
>> Sigma Value= 1.82326e+01 with Error =8.71316e-02
>>
>> But how ?
>>
>> Thanks for help.
>>
>> Cheers, Asif
>>
>>
>>
>>
>>
Received on Thu Mar 01 2012 - 01:59:47 CET