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? -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 -- Steve Lianoglou Graduate Student: Computational Systems Biology ?| Memorial Sloan-Kettering Cancer Center ?| Weill Medical College of Cornell University Contact Info: http://cbio.mskcc.org/~lianos/contact

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 > -- Computational Biology Fred Hutchinson Cancer Research Center 1100 Fairview Ave. N. PO Box 19024 Seattle, WA 98109 Location: M1-B861 Telephone: 206 667-2793