Re: [Rd] sort.int(S3object) strips class but not the is.object flag

From: Duncan Murdoch <murdoch.duncan_at_gmail.com>
Date: Mon, 11 Apr 2011 14:07:36 -0400

On 11/04/2011 1:10 PM, William Dunlap wrote:
> If x has an S3 class then sort.int(x) returns a value
> without an S3 class but which has the is.object flag set,
> which, I think, causes identical() give a false/misleading
> report:

Fixed in R-devel as of r55409.

Duncan Murdoch

>
> > x<- structure(1:3, class="unrecognizedClass")
> > y<- sort.int(x)
> > t<- 1:3
> > identical(y, t) # expect TRUE
> [1] FALSE
> > identical(as.vector(y), as.vector(t)) # expect TRUE
> [1] FALSE
> > dput(y)
> 1:3
> > dput(t)
> 1:3
> > class(y)
> [1] "integer"
> > class(t)
> [1] "integer"
> > is.object(y)
> [1] TRUE
> > is.object(t)
> [1] FALSE
>
> The files made by
> save(t, file="t.Rdata", compress=FALSE)
> save(y, file="y.Rdata", compress=FALSE)
> differ in 2 places, where the first is presumably
> the name of the object:
> % cmp -l y.Rdata t.Rdata
> 36 171 164
> 39 1 0
> (The problem persists after a save/load cycle.)
>
> This is on R 2.12.2 on Linux. Sorry, I don't have 2.13.0
> yet installed.
>
> Bill Dunlap
> Spotfire, TIBCO Software
> wdunlap tibco.com
>
> ______________________________________________
> R-devel_at_r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel



R-devel_at_r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel Received on Mon 11 Apr 2011 - 18:11:23 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Mon 11 Apr 2011 - 19:00:45 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-devel. Please read the posting guide before posting to the list.

list of date sections of archive