Re: Question about TF1

Rene,
Yes. It works. I defined a class myFit inherited from TF1. class MyFit : public TF1
{
...
ClassDef(MyFit,1)
};

ClassImp(MyFit);

In the fitting routine:
TH1F* th1;
MyFit* fitfunc = new MyFit("myfit",minX,maxX); ...
th1->Fit(fitfunc,option);
...

Then i write the fitted histogram to a root file.

th1->Write();
...

The problem is when i use function pointer and TF1, the fitted curve appears when i draw the histogram in the root file. When i use MyFit, the fitted curve does not show when i re-draw the histogram in the root file. The fitted parameter box does show the fitted parameters. Do i need to do something to save the curve?

Thanks,

Datao

On Mon, 2 Apr 2007, Rene Brun wrote:

> Only static functions are accepted by the fitting functions.
> In the CVS version an extension of TH1::Fit accepts fits with member
> functions of classes
> deriving from TF1 and redefining the function TF1::EvalPar. See an example of
> use
> in the attachment.
>
> Rene Brun
>
> Datao Gong wrote:
>> hi,Rooters,
>> I have a question about using TF1. I have to define a user-defined
>> function to fit histogram. If i define this function as a class member
>> function, it has to be a static member function. This requirement
>> bring me some troubles to pass member data to configure this function.
>> If i do not want to define the member data to be static type,
>> is there any easy way to pass by this problem?
>>
>> Thanks a lot,
>>
>> Datao
>>
>
>
Received on Tue Apr 03 2007 - 23:48:19 CEST