[AstroPy] Info LevMarLSQFitter

[Diana Scognamiglio]

Dear Astropy Staff,
I am Diana Scognamiglio and I have some problems to deep understand how 
LevMarLSQFitter works.

  I am trying to fit a mock Sersic galaxy using the LevMarLSQFitter classe, 
coding these lines:


ini_mod = EllipSersic2D(flux=ini_flux, r_eff=ini_r_eff, n=ini_n, 
x_0=stampsize/2.0, y_0=stampsize/2.0, g1=0.0, g2=0.0)fitter = 
fitting.LevMarLSQFitter()fit_mod = fitter(ini_mod, x_array, y_array, stamp, 
weights=weights, maxiter = 1000, acc=1.0e-7, epsilon=1.0e-6, 
estimate_jacobian=False)
I have figured out that if I change the initial parameters in ini_mod (i.e., 
ini_flux, ini_r_eff, etc), I counterintuitively obtain always a different 
result although the galaxy I am fitting is the same. How does the fit depend 
on those initial parameters?
Please, can you help me with this issue?
Thank you in advance.
I wait for hearing from you.
Best regards,
Diana Scognamiglio

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