R-beta: update.formula

Jim Lindsey (jlindsey@luc.ac.be)
Tue, 24 Feb 1998 10:17:01 +0100 (MET)

From: Jim Lindsey <jlindsey@luc.ac.be>
Message-Id: <9802240917.AA28811@alpha.luc.ac.be>
Subject: R-beta: update.formula
To: r-help@stat.math.ethz.ch (r-help)
Date: Tue, 24 Feb 1998 10:17:01 +0100 (MET)

When a formula is modified by update.formula(), it loses its attributes
i.e. is no longer of class, formula.
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