Possible typo in users' guide?

[atd]

Hello

I think there is a typo in function name:
root.cern.ch/root/htmldoc/guide … ted-errors

FCN Upper value for Error Definition (MinimizerOptions::SetMaxIterations(int )). Value in the minimization function used to compute the parameter errors. The default is to get the uncertainties at the 68% CL is a value of 1 for a chi-squared function minimization and 0.5 for a log-likelihood function.

And after a few lines,

Precision (MinimizerOptions::SetTolerance(double )). Precision value in the evaluation of the minimization function. Default is numerical double precision.

There is a function called “ROOT::Math::MinimizerOptions::SetPrecision()” and another one called “ROOT::Math::MinimizerOptions::SetTolerance();”. Are they the same?

Thank you for your time.

Greetings.

[moneta]

Hi,

Thank you for reporting this typos. I will fix it now.

Concerning your question, SetPrecision and SetTolerance are different. SetTolerance is used for the minimisation convergence, when the expected distance from the minimum is less than the given tolerance the minimisation will stop.
SetPrecision can be used to notify Minuit that a different precision is used when computing the objective function. In general when double precision is used to compute the function, there is no need to change the default precision using SetPrecision

Best Regards

Lorenzo

[atd]

Hello

Thank you for the clarification.

Greetings.