[R] various ordinations

Michael Camann camann at babylon.cnrs.humboldt.edu
Tue Aug 22 08:03:51 CEST 2000


I'm developing a library of functions for community ecology analyses and
have a couple of questions that I've not been able to answer via faqs or

1) Are there existing functions for:

    a) Bray-Curtis (polar) ordination?
    b) non-metric multidimensional scaling (NMDS)?
    c) canonical correlation analyses (CCA and DCA)?
    d) TWINSPAN (doubtful...)?

2) If not, does anyone have these functions already?

3) I'm having difficulty figuring out how to dyn.load C object files in a
windows environment, which I admittedly know little about.  I'm using the
Cygwin/Gnu compiler, no difficulty compiling or (I think) producing
.dll's, but I always get an error when I try to dyn.load the .dll's that
says a file is missing.  Sorry, I can't reproduce the exact error mesg
from this machine, so let me know if it's critical-- nonetheless the mesg
is something to the effect that an important file is missing.  I'm running
R 1.0, so if this is a version problem it'll go away when I update, any
day now....  As the text above suggests, I'm also not entirely certain
that I'm producing the .dll's correctly and the 1.0.0 win-faq is a bit vague on
this point.  Could someone familiar with this please post brief
instructions or reply directly?  I didn't see anything in the (recent) help archives.

Unfortunately, I will need to work this in a MSWindows environment in
order to coordinate with the University's computing platforms.  I can post
code fragments, compiler output, and R output later if necessary, but I
thought it might be more useful to insure that I understand the process
fully before cluttering the list further.


--Mike C.

Michael A. Camann                                  Voice: 707-826-3676
Assistant Professor of Zoology                       Fax: 707-826-3201
Institute for Forest Canopy Research     Email: mac24 at axe.humboldt.edu
Department of Biology                            ifcr at axe.humboldt.edu
Humboldt State University           
Arcata, CA 95521


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