[RooFit] How could I know "MINUIT WARNING IN MIGRAD&quo

ROOT
1

Hello,

I just want to do many fittings within a Loop and print out the summary of fitting status of each one finally. I noticed that there is some warnings like:

[quote]
MINUIT WARNING IN MIGRAD
============== Negative diagonal element 1 in Error Matrix
MINUIT WARNING IN MIGRAD
============== Negative diagonal element 2 in Error Matrix
MINUIT WARNING IN MIGRAD
============== 1.00006 added to diagonal of error matrix[/quote]

but the fit status is still 0, and the covQual is also ok (=3). So how could I know whether there is such warnings occurred?

Thank you very much.

2

Hi,

At present TMinuit does not keep track of these occurences (or at least provides an interface through which this information can be retrieved), thus I have no way
to retrieve this information to be stored in a RooFitResult.

On the other hand, I assume that when MINUIT at the end says that covQual = OK it will be correct in that statement and means that any prior warning were apparently transient and can be ignored.

Wouter

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