EViews.com

options for derivative method is left out.

Besides, logl::append should be a Proc, not a View as the object ref documents. (sorry my typo last time)

I'll make a note of the deriv keyword.

For what it's worth, while the definition of a Views and a Proc is sometimes slippery, generally Procs are things that modify the object or explicitly generate output. By that standard, append is probably a Proc.