RooFitResults

[argiro]

Hi,

I am having troubles accessing RooFitResults methods.

a_nevt     = RooRealVar ("a","a",6000,0,10000)
b_nevt     = RooRealVar ("b","b",2000,0,10000)

result = modelPdf.fitTo(data)
c= result.correlation(a_nevt.GetName(),b_nevt.GetName())

gives

c= result.correlation(a.GetName(),b.GetName())
TypeError: none of the 4 overloaded methods succeeded. Full details:
Double_t RooFitResult::correlation(const RooAbsArg& par1, const RooAbsArg& par2) =>
could not convert argument 1
const RooArgList* RooFitResult::correlation(const RooAbsArg& par) =>
takes at most 1 arguments (2 given)
attempt to access a null-pointer
const RooArgList* RooFitResult::correlation(const char* parname) =>
takes at most 1 arguments (2 given)

on the other hand if I change to

c= result.correlation(a,b)

I get

c= result.correlation(a,b)
TypeError: none of the 4 overloaded methods succeeded. Full details:
attempt to access a null-pointer
const RooArgList* RooFitResult::correlation(const RooAbsArg& par) =>
takes at most 1 arguments (2 given)
Double_t RooFitResult::correlation(const char* parname1, const char* parname2) =>
could not convert argument 1 (expected string or Unicode object, RooRealVar found)
const RooArgList* RooFitResult::correlation(const char* parname) =>
takes at most 1 arguments (2 given)

Of course I have tried also by spellin the name explcitely (correleation('‘a’,‘b’))
how can help the system find the right binding ?

thanks

Stefano

[argiro]

opps,

I did not realize I am trying to access a null pointer !

 result = modelPdf.fitTo(data,RooFit.Save())

is the solution

sorry for the noise

Stefano

[rooter_03]

Hi,

Do you mean

result = modelPdf.fitTo(data,RooFit::Save())

right? (root.cern.ch/root/html/RooAbsPd … sPdf:fitTo)