From plummer@iarc.fr  Mon Feb 22 16:29:14 1999
From: plummer@iarc.fr (Martyn Plummer)
Date: Mon, 22 Feb 1999 17:29:14 +0100 (CET)
Subject: "as" functions should be generic
Message-ID: <XFMail.990222172914.plummer@iarc.fr>

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.

Martyn
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"as" functions should be generic
Martyn Plummer