[BioC] Inconistent behavior with all/any and Rle

[Martin Morgan]

On 10/11/2010 07:55 PM, Steve Lianoglou wrote:
> Hi,
> 
> I'm not sure what this should actually return. I think I was surprised
> that it returned TRUE:
> 
> R> all(Rle(rep(FALSE, 0)))
> [1] TRUE
> 
> R> all(Rle(rep(FALSE, 0)))
> [1] TRUE
> 
> But ok. Then:
> 
> R> any(Rle(rep(FALSE, 0)))
> [1] FALSE
> 
> R> any(Rle(rep(TRUE, 0)))
> [1] FALSE
> 
> `any` should be more "permissive" than `all`, shouldn't it? But also,
> maybe a 0 length logical Rle should return something else in these
> scenarios?

compare with all(logical()) and any(logical()); here's one thread

  https://stat.ethz.ch/pipermail/r-devel/2006-January/036041.html

and a link to wikipedia

  http://en.wikipedia.org/wiki/Empty_set

where the 'Operations on an empty set' section is relevant. 'all' is
like product, 'any' like sum, and logical(0) the empty set.

Martin

> 
> -steve
> 
> sessionInfo()
> R version 2.13.0 Under development (unstable) (2010-09-21 r52957)
> Platform: x86_64-unknown-linux-gnu (64-bit)
> 
> locale:
>  [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C
> LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8     LC_MONETARY=C
>  [6] LC_MESSAGES=en_US.UTF-8    LC_PAPER=en_US.UTF-8       LC_NAME=C
>                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
> 
> other attached packages:
> [1] IRanges_1.7.39
> 


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