Jeffrey:
I wrote impdiff some time ago. If you look at the comments in the code,
there is an example, which covers its use.
Best,
Dan Stanger
> >/ Also, I don't know what format the implicit_derivative
> />/ routine in the impdiff package is expecting. A demo or an example would have
> />/ helped. At least it is easy to get around the need for it because the
> />/ formula is so simple.
> /
>