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This backend features a Newton-like algorithm. The user has to supply a
Hessian function. No constraints are honoured. If the supplied Hessian
function actually returns the inverse of the Hessian, set
inverse_hessian to true. Supplying the inverse Hessian is
preferable, if possible.
Returned value cvg will be 2 or 3 for success and
0 or -1 for failure (
see
nonlin_min for
meaning). Returned structure outp will have the fields
niter, nobjf, and user_interaction.
Interpretation of Display: if set to "iter", some
diagnostics are printed.