Message-ID: <199803271433.PAA09656@sophie.ethz.ch>
Date: 1998-03-27T14:33:02Z
From: Martin Maechler
Subject: R: did you know ``comment(.) and comment(.) <- ...''
I'm doing some systematic investigations about which functions are
<primitive> in R (and which of these should be changed to .Internal(...))...
I just discovered :
> x <- 1:10
> comment(x)
NULL
> comment(x) <- "x is just a vector"
> x
[1] 1 2 3 4 5 6 7 8 9 10
> attributes(x)
$comment
[1] "x is just a vector"
> comment(x)
[1] "x is just a vector"
----------
Who of you (besides Ross?) did know this feature.
"comment" is an *INVISIBLE* (for printing)
attribute you can give to anything, including functions and data.frames.
Any volunteer for writing a Rdoc file "comment.Rd" (for `?comment' to
work)?
Martin
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