Can I ask some questions?
I’m doing fit with user defined function with 5 parameters.
When I do the fit, root said
’STATUS = CALL LIMIT’ and ERROR MATRIX UNCERTAINTY 17.3 per cent(sometimes 2%, 50%…etc).
So I put
in my code, and now root says
’STATUS = NOT POSDEF’ and ERR MATRIX NOT POS-DEF’
Is that okay to change maximum function call in this case?
And I think NOT POSDEF means ‘not positive definite’.
(well it is curve fit)
Then is that possible to some parameters are correlated?
(Maybe I should fix some parameters…)
Thank you and have a nice day!