Hi Rene,
I am a bit confused. In the stress example it says
#ifndef __CINT__
func = f1int;
TF1 *f1int = new TF1("f1int",func,-10,10,9); // this one will be
compiled
#else
TF1 *f1int = new TF1("f1int",f1int,-10,10,9); // this one will be
interpreted
#endif
Of course it will work in the compiled code because #ifndef __CINT__ it will
produce correct TF1 constructor call with real pointer to a function func.
To get this pointer you have
func = f1int
with Double_t(*func)(double *, double *);
In case of CINT it will also produce correct code because CINT will
recognise f1int as a name of predefined function and use it as a pointer to
a function.
What I am asking is how to construct TF1 in the compiled code with a
function from preloaded CINT macro? I need to have Double_t(*func)(double *,
double *) to produce correct constructor call and I can not use the name of
a function from preloaded macro just because I am in the program, not in
CINT!
Best,
Anton
-----Original Message-----
From: brun@pcbrun.cern.ch [mailto:brun@pcbrun.cern.ch]On Behalf Of Rene
Brun
Sent: Monday, February 28, 2000 3:50 PM
To: Anton Fokin
Cc: Rene Brun; roottalk@pcroot.cern.ch
Subject: Re: TF1 with CINT preloaded function
Hi Anton,
Look at the small example stress1 in $ROOTSYS/test/stress.cxx
Rene Brun
Anton Fokin wrote:
>
> Hi Rene,
>
> One of TF1 constructors is to create TF1 from a user defined function
>
> TF1 TF1(const char* name, void* fcn, Float_t xmin, Float_t xmax, Int_t
npar)
>
> It works fine in case of CINT
>
> Double_t myfunction(Double_t *x, Double_t *par)
> {
> Float_t xx =x[0];
> Double_t f = TMath::Abs(par[0]*sin(par[1]*xx)/xx);
> return f;
> }
> void myfunc()
> {
> TF1 *f1 = new TF1("myfunc",myfunction,0,10,2);
> f1->SetParameters(2,1);
> f1->SetParNames("constant","coefficient");
> f1->Draw();
> }
>
> Now if I want to create TF1 in my compiled code with myfunction defined in
a
> macro loaded via gROOT->LoadMacro() ... where can I get a pointer (void*
> fcn) to myfunction for TF1 constructor?
>
> Best regards,
> Anton
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