MINUIT did not return a contour graph

Roofit and RooStats
1

Dear experts,

I’m trying to use the contour method of RooMinuit, but some times I get error message like this:

MNCONT UNABLE TO FIND FOUR POINTS.
[#0] ERROR:Minization – RooMinuit::contour(RooMinuit) ERROR: MINUIT did not return a contour graph for n=2.48395

and there is no contour graph returned.

I guess this just means the algorithm used to calculate the contour failed (probably due to the complication of the NLL)? I wonder if there is any recipe for this kind of failure? Should I write some code to find the contour by myself?

Thanks!

Dongliang

2

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