[R-sig-eco] vegan RDA triplot species arrows

[Gavin Simpson]

On Wed, 2011-05-04 at 15:44 -0400, Tyler Smith wrote:
> Hi,
> 
> Why does vegan not plot species as arrows in plot? I know how to use
> scores() and arrows() to create my own arrows, but it seems odd that
> this feature is not built in. Is there ever a situation where species
> *should* be plotted as points rather than arrows?
> 
> I checked ?plot.cca, vegan-decision, and google, but I didn't find
> anything, (excepting the possibility of using biplot.rda, but only for
> unconstrained analyses).

I don't know, but it might having something to do with Jari's aversion
to using linear methods for species data ;-)

More seriously, perhaps this hasn't/didn't occur to the developers,
despite being the author of biplot.rda() I never got round to doing a
triplot() generic and method...

If you would care to offer some code it would be appreciated, otherwise
I might get to take a look later in May.

G

> Thanks,
> 
> Tyler
> 
> _______________________________________________
> R-sig-ecology mailing list
> R-sig-ecology at r-project.org
> https://stat.ethz.ch/mailman/listinfo/r-sig-ecology

-- 
%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%
 Dr. Gavin Simpson             [t] +44 (0)20 7679 0522
 ECRC, UCL Geography,          [f] +44 (0)20 7679 0565
 Pearson Building,             [e] gavin.simpsonATNOSPAMucl.ac.uk
 Gower Street, London          [w] http://www.ucl.ac.uk/~ucfagls/
 UK. WC1E 6BT.                 [w] http://www.freshwaters.org.uk
%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%