On 16 November 2008 at 15:51, Prof Brian Ripley wrote:
| See the manual we wrote to help you, 'Writing R Extensions'. If that is
| not enough, the topic is covered in several books on R, including 'S
| Programming'. You can also find on-line tutorials of various qualities
| (often obsolete or inaccurate).
That is a somewhat curious comment given that 'S Programming' -- a book I
absolutely loved when it came out, that I learned a lot from and that I still
like -- is also 'obsolete and inaccurate' given its eight years of age. It
devotes under two pages to R package building, does not cover NAMESPACES, is
of course a number of revisions behind the current S4 standard etc pp.
I second the recommendation of 'Writing R Extension', but that is not the
most linear or coherent introduction. So despite the dire warning about
anything not authored by Prof Ripley, for an introduction to extending R via
C/C++ code, you may like the section in my UseR! 2008 tutorial on 'high
performances computing with R' that is available via
http://dirk.eddelbuettel.com/presentations.html
My preferred interface is Rcpp which IMHO eases interfacing C or C++ as you
can work more easily in native R types. Since the tutorial, I have formally
adopted Rcpp, reworked the installation and documentation, and made a new
release on CRAN -- see either one of
http://dirk.eddelbuettel.com/code/rcpp.html
http://cran.r-project.org/web/packages/Rcpp/index.html
Hope this helps, Dirk
|
| On Sun, 16 Nov 2008, Rainer M Krug wrote:
|
| > Hi
| >
| > I would like to implement the "Earth Movers Distance" into R and found
| > the code in C on the following page:
| >
| > http://www.cs.duke.edu/~tomasi/software/emd.htm
| >
| > Unfortunately, I don't know much (nearly nothing) about C and how to
| > call it from R.
| > As far as I have seen, the calling of the code from R should be rather
| > straight forward, but there are still several things I don't
| > understand.
| >
| > Could somebody please help me in calling the code from R?
| >
| > Thanks,
| >
| > Rainer
| >
| > P.S: if the code works nicely, I would like to either put it into a
| > package or add it to one.
| >
| > --
| > Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
| > Biology, UCT), Dipl. Phys. (Germany)
| >
| > Centre of Excellence for Invasion Biology
| > Faculty of Science
| > Natural Sciences Building
| > Private Bag X1
| > University of Stellenbosch
| > Matieland 7602
| > South Africa
| >
| > ______________________________________________
| > 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, [EMAIL PROTECTED]
| 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.
--
Three out of two people have difficulties with fractions.
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