Re: [Rd] identical() fails to compare isS4(<S4 instance>) to TRUE

From: Duncan Murdoch <murdoch.duncan_at_gmail.com>
Date: Thu, 04 Oct 2012 17:23:34 -0400

On 12-10-04 4:57 PM, Martin Morgan wrote:
>
> > setClass("A", "integer")
> > isS4(new("A"))
> [1] TRUE
> > identical(isS4(new("A")), TRUE)
> [1] FALSE
>
> > sessionInfo()
> R Under development (unstable) (2012-10-04 r60876)
> Platform: x86_64-unknown-linux-gnu (64-bit)
>
> locale:
> [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
> [3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
> [5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
> [7] LC_PAPER=C LC_NAME=C
> [9] LC_ADDRESS=C LC_TELEPHONE=C
> [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
>
> attached base packages:
> [1] stats graphics grDevices utils datasets methods base
>

I can confirm this in R-devel, but it doesn't happen in R-patched. In R-devel, isS4 is returning a vector marked as LGLSXP, but containing the value 16, not the usual 1 for TRUE.

 > .Internal(inspect(isS4(new("A"))))
@4bfbed8 10 LGLSXP g0c1 [] (len=1, tl=0) 16

I'm not going to have time to track this down and fix it.

Duncan Murdoch



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