"as" functions should be generic

[Kurt Hornik]

>>>>> Martyn Plummer writes:

> It would be very useful if all "as.*" functions were generic,
> so that a user who creates a new class can write methods to
> coerce objects of that class to standard R objects.

> In fact, most of the "as.*" functions are generic, but there
> are a few that aren't:
> as.array
> as.factor
> as.ordered
> as.pairlist
> as.formula
> as.ts

> It's actually "as.array" and "as.ts" that are a problem for
> me, but I mention the others because this seems like a good
> general principle.

This may be a good idea.

-k

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