dear R-friends,
i have a set of vegetation and environmental data:
veg <- read.table("http://www.alectoria.at/dl/rmalliveg.csv";,
header=TRUE, sep=";")
env <- read.table("http://www.alectoria.at/dl/rmallienv.csv";,
header=TRUE, sep=";")
with the library "vegan" i did a constrained correspondence analysis(cca):
rmcca <- cca(veg,env)
and with ordihull from "vegan" it is possible to draw a line or polygon around
manually
given group(s) - (groups = Factor giving the groups for which the graphical
item is drawn) - in the plot of the cca.
rmlab <- read.table("http://www.alectoria.at/dl/rmlabel.csv";)
attach(rmlab)
ordihull(rmcca, V1, display="sites")
my question in a (more general) way: is it may be possible to get the
centroid-coordinates from such
manually given groups of a cca or is it may be possible to draw the centroid of
such group(s)?
with greetings from austria
helli
> version
_
platform i386-pc-mingw32
arch i386
os mingw32
system i386, mingw32
status
major 2
minor 3.1
year 2006
month 06
day 01
svn rev 38247
language R
version.string Version 2.3.1 (2006-06-01)
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