Invalid minimum warning

I am very new to MINUIT. I am using a chi-square function and MINUIT to minimize it with 4 free parameters. And, even though, my fit is very close to the expected, I am having messages that MINUIT did not converge and that FunctionMinimum is invalid. Does this mean that minimization is not successful and I am not having valid parameter values with these warnings? I’ve attached a log file with those warnings just in case.

Thanks in advance,

Minimization results for Mosaic21.txt (14 KB)

Yes, the minimisation did not converge. If you compile Minuit2 with the option
you might get more meaningful error messages

Best Regards


Thank you, Lorenzo, I’ll try it.

BTW, I’ve noticed that while for most iterations of MINUIT F value atays at around 500, at some iterations it jumps up to 20 000. What could be the reason for this? I guess this has something to do with MINUIT warnings.