Robert Gentleman wrote: > Hi, > We had the "names" discussion and, AFAIR, the idea that someone might > misinterpret the output as suggesting that one could index by number, > seemed to kill it. A more reasonable argument against is that names<- is > problematic. > > You can use $, [[ (with character subscripts), and yes ls does sort of > do what you want (but sorts the values, not sure if that is good). I > think it is also inefficient in that I believe it copies the CHARSXP's > (not sure we really need to do that, but I have not had time to sort out
I misremembered - it does not copy CHARSXPs. > the issues). And there is an eapply as well, so ls() is not always needed. > > mget can be used to retrieve multiple values (and should be much more > efficient than multiple calls to get). There is no massign (no one seems > to have asked for it), and better design choice might be to vectorize > assign. > > best wishes > Robert > > > > > > Vladimir Dergachev wrote: >> On Wednesday 13 December 2006 1:23 pm, Marcus G. Daniels wrote: >>> Vladimir Dergachev wrote: >>>> 2. It would be nice to have true hashed arrays in R (i.e. O(1) access >>>> times). So far I have used named lists for this, but they are O(n): >>> new.env(hash=TRUE) with get/assign/exists works ok. But I suspect its >>> just too easy to use named lists because it is easy, and that has bad >>> performance ramifications for user code (perhaps the R developers are >>> more vigilant about this for the R code itself). >> Cool, thank you ! >> >> I wonder whether environments could be extended to allow names() to work >> (altough I see that ls() does the same function) and to allow for(i in E) >> loops. >> >> thank you >> >> Vladimir Dergachev >> >> ______________________________________________ >> R-devel@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-devel >> > -- Robert Gentleman, PhD Program in Computational Biology Division of Public Health Sciences Fred Hutchinson Cancer Research Center 1100 Fairview Ave. N, M2-B876 PO Box 19024 Seattle, Washington 98109-1024 206-667-7700 [EMAIL PROTECTED] ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
