[Help-gsl] Nonlinear Least-Squares Fitting

[Anna Russo Russo]

Hi!

I've run the "Exponential Fitting Example", from the GSL 2.4 documentation,
and I noticed that, if the number of data points is greater than 56, the
solver terminates with status "exceeded max number of iterations". It
happens even if I allow it to perform a considerably larger number of
iterations: after the first iteration the parameters are so different from
the right ones that the value of the function to be minimized is 'nan' and
they don't change in the next iterations.

What may be the cause for this behavior?

Thanks for reading,

Anna