Is it possible to put upper and lower bounds using nlgreyest?

Hi!

I'm using nlgreyest command to estimate parameters of a grey-box model and using different types of search methods, like "lsqnonlin" (Trust region reflective algorithm provided by the Optimization Toolbox) and "lm" (Levenberg-Marquardt least squares search).

Considering the lsqnonlin method, I saw that it is possible to input upper and lower bounds, but I can't seem to find it in nlgreyest options set. Is it possible to do it?

I'm asking this because there are variables that must be >=0 and I would like to search for answers that respect this restriction. If I can't set upper and lower bounds, is there any other way to look at this problem using nlgreyest?

Best regards,

Rodrigo Pereira de Sousa

Answer 1

[Dipak]

You set the bounds on the parameters in the idnlgrey model. Refer - https://nl.mathworks.com/help/ident/ref/idnlgrey.html#inputarg_Parameters

[Rodrigo Sousa]

Thank you Dipak! I was using the "fixed" condition and forgot that it has those options too.