On 09/30/2015 05:28 PM, Michael Lawrence wrote:
It wasn't a conscious choice, but it would slow things down a bit. Not by much though, since we're already attempting dispatch on length(). I can make the change.
That would be great. Thanks Michael! H.
On Wed, Sep 30, 2015 at 1:33 PM, Hervé Pagès <hpa...@fredhutch.org <mailto:hpa...@fredhutch.org>> wrote: Hi Michael, I was expecting this to just work: base::lengths(IntegerList(1:4, 1:6)) but it doesn't: Error in base::lengths(IntegerList(1:4, 1:6)) : 'x' must be a list or atomic vector The man page says: This function loops over ‘x’ and returns a compatible vector containing the length of each element in ‘x’. Effectively, ‘length(x[[i]])’ is called for all ‘i’, so any methods on ‘length’ are considered. If length(x[[i]]) is called for all i then it should work on any object for which [[ is defined. Note that this is what happens with base::sapply(), base::mapply(), etc... they all use [[ internally. Do you know of any reason why lengths() doesn't do this? Thanks, H. On 09/28/2015 09:51 PM, Michael Lawrence wrote: That is the plan. Note that we already have elementLengths() that serves the same purpose. It was the direct inspiration for lengths(). On Mon, Sep 28, 2015 at 9:41 PM, Peter Hickey <peter.hic...@gmail.com <mailto:peter.hic...@gmail.com>> wrote: The lengths() function was added in R 3.2 to "get the length of each element of a list or atomic vector (is.atomic) as an integer or numeric vector." It seems useful to me to have also a similar method defined for the S4Vectors::List class (and subclasses). What do others think? [[alternative HTML version deleted]] _______________________________________________ Bioc-devel@r-project.org <mailto:Bioc-devel@r-project.org> mailing list https://stat.ethz.ch/mailman/listinfo/bioc-devel [[alternative HTML version deleted]] _______________________________________________ Bioc-devel@r-project.org <mailto:Bioc-devel@r-project.org> mailing list https://stat.ethz.ch/mailman/listinfo/bioc-devel -- Hervé Pagès Program in Computational Biology Division of Public Health Sciences Fred Hutchinson Cancer Research Center 1100 Fairview Ave. N, M1-B514 P.O. Box 19024 Seattle, WA 98109-1024 E-mail: hpa...@fredhutch.org <mailto:hpa...@fredhutch.org> Phone: (206) 667-5791 <tel:%28206%29%20667-5791> Fax: (206) 667-1319 <tel:%28206%29%20667-1319>
-- Hervé Pagès Program in Computational Biology Division of Public Health Sciences Fred Hutchinson Cancer Research Center 1100 Fairview Ave. N, M1-B514 P.O. Box 19024 Seattle, WA 98109-1024 E-mail: hpa...@fredhutch.org Phone: (206) 667-5791 Fax: (206) 667-1319 _______________________________________________ Bioc-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/bioc-devel
