RooFormulaVar error in ROOT 6.22.06

[brentstone]

I recently updated to macOSX 11.1 and am now using ROOT 6.22.06. I previously used 6.18.04 on OSX 10.14 (or approximate).

When trying to create a RooFormulaVar that is the minimum of two numbers, I now get an error trying to create the object.

Here is an example. When running the code here:

RooRealVar r("MH","MH",5,0,10);
RooFormulaVar("form","form","min(MH,1)",RooArgList(r));

an error is produced like such:

input_line_19:2:66: error: call to 'Min' is ambiguous
Double_t TFormula____id16825570130930576839(Double_t *x){ return TMath::Min(x[0],1) ; }
                                                                 ^~~~~~~~~~
/Users/brentstone/Dropbox/rootBuild_62206/include/TMathBase.h:186:21: note: candidate function
inline Int_t TMath::Min(Int_t a, Int_t b)

...

Error in <prepareMethod>: Can't compile function TFormula____id16825570130930576839 prototype with arguments Double_t*
Error in <TFormula::InputFormulaIntoCling>: Error compiling formula expression in Cling
Error in <TFormula::ProcessFormula>: Formula "min(x[0],1)" is invalid !
[#0] FATAL:InputArguments -- RooFormula 'form' did not compile or is invalid.
Input:
	min(MH,1)
Passed over to TFormula:
	min(x[0],1)
Error in <TRint::HandleTermInput()>: std::runtime_error caught: RooFormula 'form' did not compile or is invalid.
Input:
	min(MH,1)
Passed over to TFormula:
	min(x[0],1)

Previously I had no problem running this code. Any help on how to encode this kind of function in this new version of ROOT would be appreciated. Thanks!

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[couet]

I think @moneta can help you.

[moneta]

Hi,
Now ROoFormula does not compile because you have a small C++ error. From 6.22 RooFormula uses the compilation of Cling which makes it more powerful but also more stringent in term of allowing C++ errors.
min(double, integer) is ambiguous as the error message says.
Just do :

RooFormulaVar("form","form","min(MH,1.)",RooArgList(r));

Lorenzo

[brentstone]

Ah ok, thanks a ton @moneta!