Thankyou Brian (and others). Very useful information(as usual).
-- Bert
-Original Message-
From: Prof Brian Ripley [mailto:[EMAIL PROTECTED]
Sent: Wednesday, May 14, 2008 10:29 PM
To: Bert Gunter
Cc: r-help@r-project.org
Subject: Re: [R] Attributes or list programming "efficiency
On Wed, 14 May 2008, Bert Gunter wrote:
R-Fellow Travellers:
Asked from the perspective of a software development amateur ...
Suppose one wishes to create data structures that have both data and
metadata -- e.g. a data.frame and details about where, when, and by whom the
data were gathered (sp
At 2:26 PM -0400 5/14/08, Gabor Grothendieck wrote:
The key difference is inheritance.
Objects consisting of data frames with attributes, including a class attribute
such as c("myclass", "data.frame), can inherit data frame methods but a list
with a data frame component will require entirely new
The key difference is inheritance.
Objects consisting of data frames with attributes, including a class attribute
such as c("myclass", "data.frame), can inherit data frame methods but a list
with a data frame component will require entirely new methods to be constructed
for everything.
On Wed,
R-Fellow Travellers:
Asked from the perspective of a software development amateur ...
Suppose one wishes to create data structures that have both data and
metadata -- e.g. a data.frame and details about where, when, and by whom the
data were gathered (specifics not important here).
1. Is there
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