[SciPy-Dev] optimize: what should happen if objective functions return non-finite numbers?

[Pauli Virtanen]

Wed, 15 Jun 2016 18:53:22 +0000, Pauli Virtanen kirjoitti:
[clip]
> I think this is a different issue --- the only way curve_fit
> communicates fit failures in general is via setting the estimated
> covariances to infinity. This is not so convenient, but that's how it
> works currently.

Sorry, this was wrong --- it's supposed to raise a RuntimeError, iow., 
works differently from minimize().

However, nan values confuse leastsq() to think it converged --- this can 
and should be fixed.