Hi Michael, In addition to Eddy's comments on your problem, it is my experience that most minimization problems are due to incorrect bin errors, in particular in case of weighted entries. You should provide more information on your particular problem - send a Root file with the histogram you try to fit - a simple script Rene Brun Michael Groys wrote: > > 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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