Re: [R] Attributes or list programming "efficiency"

From: Gabor Grothendieck <ggrothendieck_at_gmail.com>
Date: Wed, 14 May 2008 14:26:00 -0400

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, May 14, 2008 at 2:15 PM, Bert Gunter <gunter.berton_at_gene.com> 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 (specifics not important here).
>
> 1. Is there any inherent processing advantage in R in representing this as a
> list that contains both the data and metadata as components vs as a
> data.frame with the metadata as attributes?
>
> 2. Is there a compelling software architecture argument to favor one vs the
> other?
>
> I suspect the answer is no in both cases, but I thought I'd ask. This seems
> to be mainly relevant for S3 programming, as in S4 one might stick the info
> into different slots (if one wishes to dispatch on them).
>
> Cheers to all,
>
> Bert Gunter
> Genentech
>
>
>
>
>
>
>
>
> [[alternative HTML version deleted]]
>
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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Wed 14 May 2008 - 22:00:03 GMT

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