search for: twinspan

...munity ecology analyses and have a couple of questions that I've not been able to answer via faqs or docs. 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&...

...ting functions for: > > a) Bray-Curtis (polar) ordination? I've written a DOS program some years ago and I've reworked the core code, following E.Beals, 1984. > b) non-metric multidimensional scaling (NMDS)? > c) canonical correlation analyses (CCA and DCA)? > d) TWINSPAN (doubtful...)? I've the sources of twinspan (I should search them ...). For the other I've some matlab code, the code developed by Legendre. However I think the right way would be to port the ADE-4 (http://pbil.univ-lyon1.fr/ADE-4/ADE-4.html) programs to R. I know that the source code is...

.... I hope this is of some interest and it does raise the general point that programming literate ecologists don't seem to have yet fully embraced S-Plus or R. Having only recently found S-Plus and R myself I had rather hoped that some of the common ecological statistical tools such as CCA, Twinspan and Decorana, plus the miscellaneous tools described in Krebs (1989) might have found there way into an R package. Krebs, CJ (1989) Ecological Methodology, Harper & Row. Now as a 2nd edition 1995?) Cheers, Graham S -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-...

Is there an R function that does canonical correspondence analysis. Can it be done using the VR function corresp()? If not, how hard it be to write R code to do it? I am a population biologist with long but patchy programming experience in C, Smalltalk, Java and other languages. Thanks, Patrick Foley patfoley at csus.edu