Hi Ahmet,
See this short example. For more details, see doc
of TH1::Fit
{
TF1 *f1 = new TF1("f1","gaus+pol1(3)",-3,3);
f1->SetParameters(100,0,1,60,-8);
TH1F *h = new TH1F("h","h",100,-3,3);
h->FillRandom("f1",10000);
f1->SetParLimits(2,1,1);
h->Fit("f1","b");
}
Rene Brun
On Wed, 24 Jul 2002, Ahmet Sedat Ayan wrote:
>
> Dear Rooters,
> I am trying to do a linear background + gaussian fit to my data and when
> force a fixed width (sigma) to the gaussian function
>
> with Fiffunction->FixParameter(par,value)
>
> I am still getting the Sigma calculated NOT the value I want that I want
> the fit function to use.
>
> Could anyone comment on that please?
>
> thanx a lot and cheers
> ahmet.
>
> ***************
>
> Ahmet Sedat Ayan
>
> Physics & Astronomy Dept.
> Van Allen Hall
> University of Iowa
> Iowa City, IA, 52242
>
> Voice : (++ 1 319) 335-1941 (W) (GMT-6)
> Occupation : Ph.D Candidate (But still dreamer!)
> e-mail : ayan@cms.physics.uiowa.edu
> web : http://jazz.physics.uiowa.edu/~ayan
>
>
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