[SciPy-User] optimize leastsq

[Johannes Radinger]

Hello,

I just wanted to ask you about the output of leassq.
Besides the fitted values I also get an integer flag 1-4.

http://docs.scipy.org/doc/scipy/reference/generated/scipy.optimize.leastsq.html

what does this flag exactly mean and what are the differences between
the numbers?

Secondly I want to know the accuracy of the fit? is there any value
for e.g the residuals etc. or what is the requested tolerance of that
algorithm?

thanks
Johannes