Outputs

To check any typing error or missing specification, first are displayed the options, the required precision, the maximum number of function evaluations and the method parameters.

The frequency of the intermediate displays are controlled by the `SET/FIT
PRINT=iter`.
It includes the display of the iteration number, the actual
number of function evaluations, the sum of the squares of the residuals,
the so-called reduced chi, the percentage of decrease of the reduced
chi since last iteration, and, except for the NR method,
the norm of the gradient and the dimension of the space *V*_{1} spanned by the
Jacobian. The reduced chi square is the

In any case, this is followed by the value of the parameters. Except for the

At the end, a diagnostic message telling you if the convergence was reached or if any numerical failure occurred during the algorithm. The different messages are:

--> METHOD : Convergence achieved <-- *** ERR-1-METHOD : Bad initializations ... Aborting *** *** ERR-METHOD : Likely an error in forming the derivatives *** *** ERR-NR : Problems in inverting matrix *** *** WARN-2-METHOD : No convergence reached *** *** WARN-3-METHOD : Final parameters not really satisfactory *** *** ERR-4-METHOD : No convergence in singular value decomposition *** *** WARN-5-METHOD : parameters only a good estimation *** *** ERR-i-METHOD : Final parameters are not satisfactory ***In the last message i varies from 6 to 8 and the greater i is, the less reliable are the final value of the parameters. For warnings and errors numbered more than 3, it is recommended to perform another

The diagnostic will be followed by the covariance matrix if you set
`iter` to a negative value in `SET/FIT PRINT=`.

Finally, the found optimal value of the parameters with their estimated standard deviation are listed.