# R: did you know ``comment(.) and comment(.) <- ...''

**Ross Ihaka
**
ihaka@stat.auckland.ac.nz

*Sat, 28 Mar 1998 09:31:21 +1200 (NZST)*

>* From r-devel-owner@stat.math.ethz.ch Sat Mar 28 02:30 NZS 1998
*>* Date: Fri, 27 Mar 1998 15:33:02 +0100
*>* From: Martin Maechler <maechler@stat.math.ethz.ch>
*>* To: R-devel@stat.math.ethz.ch
*>* Subject: R: did you know ``comment(.) and comment(.) <- ...''
*>* Mime-Version: 1.0 (generated by tm-edit 7.95)
*>*
*>* 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.
*
You are making the assumption that I know about this :-).
I do have a very vague memory of trying something like this as
and experiment. Is it worth keeping?
Ross
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