Hi Jeff,
Indeed there was something about plain-text in the r-help posting
guide although I can't find it there anymore.
https://www.r-project.org/posting-guide.html
Is it still an requirement?
Jeff, thanks for you constructive contribution ;) . Glad that you know
about plain text mode in e-mails, beside doing some perl programming.
I forgot about both. Even the linux admin's I know use python and
thunderbird or some webmail nowadays not pine and perl, but I do not
much networking, so what do I know.
I think the question I am asking is legitimate. The access complexity
of datastructures is specified in the documentation in case of python
datastructures, java collections or stl containers.
I guess this information is available for name access on R-list but I
just can't find it.
regards
On 7 September 2015 at 16:37, Jeff Newmiller <jdnew...@dcn.davis.ca.us> wrote:
> You puzzle me. Why does someone who cannot figure out how to post an email in
> plain text after so many messages on this mailing list get all worried about
> access time for string indexing?
>
> Environment objects have those properties. They do not solve all problems
> though, because they are rather heavyweight... you need a lot of lookups to
> pay for their overhead. R5 objects and the hash package both use them, but I
> have never found three need to use them. Yes, I do program in Perl so I know
> where you are coming from, but the vector-based name lookup used in R works
> quite effectively for data where the number of list items is short or where I
> plan to access every element as part of my data processing anyway.
> ---------------------------------------------------------------------------
> Jeff Newmiller The ..... ..... Go Live...
> DCN:<jdnew...@dcn.davis.ca.us> Basics: ##.#. ##.#. Live Go...
> Live: OO#.. Dead: OO#.. Playing
> Research Engineer (Solar/Batteries O.O#. #.O#. with
> /Software/Embedded Controllers) .OO#. .OO#. rocks...1k
> ---------------------------------------------------------------------------
> Sent from my phone. Please excuse my brevity.
>
> On September 7, 2015 3:34:53 AM PDT, Witold E Wolski <wewol...@gmail.com>
> wrote:
>>What is the access time for R lists given a name of list element, is it
>>linear, log, or constant?
>>
>>Than what are to rules for names in R-lists
>>
>>That reusing names is possible makes me wonder.
>>
>>tmp <- as.list(c(1,2,3,4))
>>names(tmp) = c("a","a","b","b")
>>tmp
>>tmp$a
>>
>>
>>What I am looking for is a standard R data structure which will allow
>>me
>>for fast and name lookup.
>
--
Witold Eryk Wolski
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