Hi Fabrice,
You cannot fit a 2d histogram with a 1d function. You have 2
alternatives to do what you would like : fit (x,y) data points with a
y(x) function :
- Fill a TProfile with your points and fit it
(see http://root.cern.ch/root/html/TProfile.html)
- Fill a TGraph and fit it.
(see the macro http://root.cern.ch/root/html/examples/graph.C.html)
cheers,
Colin
Fabrice Podlyski wrote:
> Hello,
>
> I try to do a linear fit (ax+b) in a 2d histogram.
> In fact, i just want "regression line".
> I have searched in the Tutorial examples, but i 've
> found more complicated examples !
> (I try to update the myfit2.C program to my case by replacing
> the fitf function but without success !)
>
> Is it possible to do that ?
>
> Thank you in advance for your help,
>
> regards
>
> FP
--
-------------------------------------------------------------
Colin Bernet
Tel. +49-6131/39-23192 Fax +49-6131/39-22964
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