How to consistently pass options to different solvers in nlpsol (MATLAB)

[gregreich]

Hi

Recently exploring the SQPMETHOD solver in MATLAB, I noticed that while options for KNITRO and IPOPT are passed to the respective solver by a struct containing a field with a name equal to the solver (which itself is expected to be a struct with fields equal to the option names), SQPMETHOD seems to expect the individual options at the "root level" of the option struct itself: If I add a field like opts.sqpmethod = struct(); and call the nlp object – like I've done it for all other solvers so far (with their respective name in place) – I get an error that the option sqpmethod is unknown.

Am I doing something wrong, or is this intended? As it stands, it makes switching solvers a little cumbersome if they are highly parametrized.

Thank you and best regards, Gregor.