Meaning of the fit result

ROOT
1

Hello rooters,

Documentation tells:
Access to the fit status

 The function return the status of the fit (fitResult) in the following form
   fitResult = migradResult + 10*minosResult + 100*hesseResult + 1000*improveResult
 The fitResult is 0 is the fit is OK.
 The fitResult is negative in case of an error not connected with the fit.

I have a fit which returns with 4 -> this means the migradResult=4 (?)
What does it mean?
What can I learn from this?
WHat I have to change to make it 0?

Thank you for your help in advance,
k.

2

A value of migradResult = 4 means that there were some problem when running MIGRAD, i.e. an abnormal termination.
Run with more verbose printout (like option “V”) to know more about the reason of the failure

Lorenzo

3

Thank you for your help