Hello,
How can I use the TMinuit class with the FCN function being
a member-function of a class?
I've got a
class CGeometry
{
....
public:
void CalcChiSq(Int_t &, Double_t *, Double_t &f, Double_t *, Int_t);
TMinuit Minuit;
Fit(void); // calling the Minuit routines
...
}
The member function CalcChiSq uses data in the class to calculate
the chi-squared for the present set of parameters.
I set the FCN with the statement:
Minuit.SetFCN(CalcChiSq);
When I try to compile I get the following error messages:
CC: "geofix.cpp", line 1089: error: address of bound function (try using
`CGeometry::*' for pointer type and `&CGeometry::CalcChiSq' for address)
(133)
CC: "geofix.cpp", line 1089: error: bad argument 1 type for
TMinuit::SetFCN():
void (CGeometry::*)(Int_t&, Double_t*, Double_t&, Double_t*, Int_t)
( void (*)(Int_t&, Double_t*, Double_t&, Double_t*, Int_t) expected)
(1264)
When I change the SetFCN statement to:
Minuit.SetFCN(&CGeometry::CalcChiSq);
Then the compiler gives only the second error message:
CC: "geofix.cpp", line 1089: error: bad argument 1 type for
TMinuit::SetFCN():
void (CGeometry::*)(Int_t&, Double_t*, Double_t&, Double_t*, Int_t)
( void (*)(Int_t&, Double_t*, Double_t&, Double_t*, Int_t) expected)
(1264)
How can I work around this problem?
Thanks.
Martin.
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