On Thu, 24 Feb 2011, Tal Galili wrote:
Thank you all for the answers.
So if I may extend on the question -
When is it important to use 'Literal integer'?
Under what situations could not using it cause problems?
Is it a matter of efficiency or precision or both?
Efficiency: it avoids unnecessary type conversions. For example
length(x) > 1
has to coerce the lhs to double. We have converted the base code to
use integer constants because such small efficiency gains can add up.
Integer vectors can be stored more compactly than doubles, but that is
not going to help for length 1:
object.size(1)
48 bytes
object.size(1L)
48 bytes
(32-bit system).
Thanks,
Tal
----------------Contact
Details:-------------------------------------------------------
Contact me: tal.gal...@gmail.com | 972-52-7275845
Read me: www.talgalili.com (Hebrew) | www.biostatistics.co.il (Hebrew) |
www.r-statistics.com (English)
----------------------------------------------------------------------------------------------
On Wed, Feb 23, 2011 at 6:15 PM, Tsjerk Wassenaar <tsje...@gmail.com> wrote:
Hi Gene,
It means 'Literal integer'.
So 1L is a proper integer 1, and 0L is a proper integer 0.
Hope it helps,
Tsjerk
On Wed, Feb 23, 2011 at 5:08 PM, Gene Leynes <gleyne...@gmail.com> wrote:
I've been wondering what L means in the R computing context, and was
wondering if someone could point me to a reference where I could read
about
it, or tell me what it's called so that I can search for it myself. (L
by
itself is a little too general for a search term).
I encounter it in strange places, most recently in the "save"
documentation.
save(..., list = character(0L),
file = stop("'file' must be specified"),
ascii = FALSE, version = NULL, envir = parent.frame(),
compress = !ascii, compression_level,
eval.promises = TRUE, precheck = TRUE)
I remember that you can also find it when you step inside an apply
function:
sapply(1:10, function(x)browser())
Called from: FUN(1:10[[1L]], ...)
I apologize for being vague, it's just something that I would like to
understand about the R language (the R word).
Thank you!
Gene
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
--
Tsjerk A. Wassenaar, Ph.D.
post-doctoral researcher
Molecular Dynamics Group
* Groningen Institute for Biomolecular Research and Biotechnology
* Zernike Institute for Advanced Materials
University of Groningen
The Netherlands
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
--
Brian D. Ripley, rip...@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
