[Rd] R2.6 bug in arithmetics of S4 classes inherited from 'array', or intended behavior?

[Oleg Sklyar]

Narrowed down to Rev. 42246:

* ~/R/Rsvn: svn up -r42245
* ~/R/Rsvn: make
* ~/R/Rsvn: Rsvn CMD INSTALL ~/tmp/EBImage_2.1.13.tar.gz
* ~/R/Rsvn: Rsvn
> version$version.string
[1] "R version 2.6.0 Under development (unstable) (2007-07-16 r42245)"
> library(EBImage)
> a <- Image(0,c(2,2))
> class(a+a)
[1] "Image"
attr(,"package")
[1] "EBImage"

* ~/R/Rsvn: svn up -r42246
* ~/R/Rsvn: make
* ~/R/Rsvn: Rsvn CMD INSTALL ~/tmp/EBImage_2.1.13.tar.gz
* ~/R/Rsvn: Rsvn
> version$version.string
[1] "R version 2.6.0 Under development (unstable) (2007-07-16 r42246)"
> library(EBImage)
> a <- Image(0,c(2,2))
> class(a+a)
[1] "array"

* ~/R/Rsvn: svn log -r42246
------------------------------------------------------------------------
r42246 | jmc | 2007-07-16 14:32:16 +0100 (Mon, 16 Jul 2007) | 1 line

implicitGeneric() and structure class
------------------------------------------------------------------------

-- 
Dr. Oleg Sklyar * EBI-EMBL, Cambridge CB10 1SD, UK * +441223494466