Le 20 janv. 2017 à 18h09, Murray Stokely écrivait : > The lack of 64 bit integer support causes lots of problems when dealing with > certain types of data where the loss of precision from coercing to 53 bits > with > double is unacceptable.
Hello Murray, Do you mean, by eg. -1311071933951566764 loses in precision during as.numeric(-1311071933951566764) process ? Thanks, > > Two packages were developed to deal with this: int64 and bit64. > > You may need to find archival versions of these packages if they've fallen off > cran. > > Murray (mobile phone) > > On Jan 20, 2017 7:20 AM, "Gabriel Becker" <gmbec...@ucdavis.edu> wrote: > > I am not on R-core, so cannot speak to future plans to internally support > int8 (though my impression is that there aren't any, at least none that > are > close to fruition). > > The standard way of dealing with whole numbers too big to fit in an > integer > is to put them in a numeric (double down in C land). this can represent > integers up to 2^53 without loss of precision see ( > http://stackoverflow.com/questions/1848700/biggest- > integer-that-can-be-stored-in-a-double). > This is how long vector indices are (currently) implemented in R. If it's > good enough for indices it's probably good enough for whatever you need > them for. > > Hope that helps. > > ~G > > > On Fri, Jan 20, 2017 at 6:33 AM, Nicolas Paris <nicolas.pa...@aphp.fr> > wrote: > > > Hello r users, > > > > I have to deal with int8 data with R. AFAIK R does only handle int4 > > with `as.integer` function [1]. I wonder: > > 1. what is the better approach to handle int8 ? `as.character` ? > > `as.numeric` ? > > 2. is there any plan to handle int8 in the future ? As you might know, > > int4 is to small to deal with earth population right now. > > > > Thanks for you ideas, > > > > int8 eg: > > > > human_id > > ---------------------- > > -1311071933951566764 > > -4708675461424073238 > > -6865005668390999818 > > 5578000650960353108 > > -3219674686933841021 > > -6469229889308771589 > > -606871692563545028 > > -8199987422425699249 > > -463287495999648233 > > 7675955260644241951 > > > > reference: > > 1. https://www.r-bloggers.com/r-in-a-64-bit-world/ > > > > -- > > Nicolas PARIS > > > > ______________________________________________ > > R-devel@r-project.org mailing list > > https://stat.ethz.ch/mailman/listinfo/r-devel > > > > > > -- > Gabriel Becker, PhD > Associate Scientist (Bioinformatics) > Genentech Research > > [[alternative HTML version deleted]] > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > > -- Nicolas PARIS ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel