How can I pass options into the trim function?

I need to pass options=optimset('MaxFunEvals',1000) into the trim function. But, no matter how I type the function, I receive an error. How do I get this to work?

[dpb]

>> help trim

trim not found.

Use the Help browser search field to search the documentation, or
type "help help" for help command options, such as help for methods.

>>

Which trim function might this be, pray tell?