Am 01.12.2016 um 11:34 schrieb John Greenwood:

> Yes I think so. It seems that the x,y,z is needed when it is a function within a
> function as in R_Surface.  I am nesting functions 5 deep and it looks like the
> x,y,z needs to be "passed down" but I am not clear exactly what the rules are.
> The x,y,z is a bit of clutter for the user.

That shouldn't be the case -- unless the functions further down the
rabbit hole actually try to access x,y,z.

There's essentially just one special case with regards to x,y,z: If you
specify a function without a parameter list, it will default to (x,y,z).

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