Hi Cristobal,
The function given to a TF1 constructor cannot be a class member
function. It must be a normal C function.
Replace the line
Double_t Reconst1_0::pulseshape(Double_t *x, Double_t *par)
by
Double_t pulseshape(Double_t *x, Double_t *par)
Rene Brun
On Thu, 6 Nov
2003, Cristobal
Cuenca Almenar wrote:
>
> Hi!
>
> I have defined a class (Reconst1_0.C) in which a method (FitTB) fits a set of points to a funtion defined in the another method (pulseshape) of the same class. Unfortunatelly it doesn't work. These are the two methods:
>
>
> //
> Double_t Reconst1_0::pulseshape(Double_t *x, Double_t *par)
> //
> {
> Double_t newvar=(x[0]-par[1])/par[2];
> Double_t fitval=par[4]+par[0]*(newvar*par[3])*exp(-par[3]*newvar);
> return fitval;
> }
>
> //
> void Reconst1_0::FitTB(Float_t *samples, Int_t NSMP, Double_t *fitpar, Int_t gain, Int_t iped)
> //
> {
> TF1 *f_pulse = new TF1("f_pulse",pulseshape,0.,200.,5);
> f_pulse->SetParameters(fitpar[0],fitpar[1],fitpar[2],fitpar[3],fitpar[4]);
>
> TH1F *h_pulse = new TH1F("pulse histogram","pulse histogram",9,0.,9.);
> for (Int_t isample=0;isample<9;isample++)
> {
> h_pulse->SetBinContent(isample+1,samples[isample]);
> }
> h_pulse->Fit("f_pulse");
>
> f_pulse->GetParameters(&fitpar[0]);
> cout<<"fitpar "<<fitpar[0]<<fitpar[1]<<fitpar[2]<<fitpar[3]<<fitpar[4]<<endl;
> }
>
>
> this is the error message
>
> /afs/cern.ch/user/c/ccuenca/analysis/roddemo/Reconst1_0.C: In method `void Reconst1_0::FitTB (Float_t*, int, Double_t *, int, int)':
> /afs/cern.ch/user/c/ccuenca/analysis/roddemo/Reconst1_0.C:114: no matching function for call to`TF1::TF1 (const char[8], {unknown type}, double, double, int)'
> /afs/cern.ch/sw/root/v3.05.05/rh73_gcc296/root/include/TF1.h:79: candidates are: TF1::TF1 ()
> /afs/cern.ch/sw/root/v3.05.05/rh73_gcc296/root/include/TF1.h:80: TF1::TF1 (const char*, const char *, double = 0, double = 1)
> /afs/cern.ch/sw/root/v3.05.05/rh73_gcc296/root/include/TF1.h:81: TF1::TF1 (const char*, double, double, int)
> /afs/cern.ch/sw/root/v3.05.05/rh73_gcc296/root/include/TF1.h:82: TF1::TF1 (const char*, void *, double, double, int)
> /afs/cern.ch/sw/root/v3.05.05/rh73_gcc296/root/include/TF1.h:83: TF1::TF1 (const char*, Double_t (*) (Double_t *, Double_t *), double = 0, double = 1, int = 0)
> /afs/cern.ch/sw/root/v3.05.05/rh73_gcc296/root/include/TF1.h:84: TF1::TF1 (const TF1 &)
>
>
> how could I sort it out?
>
>
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