[ROOT] Convergence of minuit

From: Michael Groys (mihael@lep1.tau.ac.il)
Date: Tue Apr 29 2003 - 15:04:20 MEST 

Dear rooters,
I'm using TMinuit class with some complex theoretical function
for minimization of chi2 for set of data points.
Often I get following messages:
  MIGRAD FAILS TO FIND IMPROVEMENT
  MIGRAD TERMINATED WITHOUT CONVERGENCE.
Changing of initial values and errors doesn't help.
What can be done to avoid this problem?
I'am interesting in parameter errors.
But errors that minuit returns in this case are invalid.
Thanks,
	Michael

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