[R] How can I change characteristics of a cca biplot in R

[Gavin Simpson]

On Mon, 2009-09-07 at 12:49 +0300, Rousi Heta wrote:
> 
> Hi,
> 
> I´m doing cca for a community data set in R and I have made a biplot
> for my data. Otherwise everything seems to be allright but the biplot
> is so messy I can´t read it well enough or publish it. I would like to
> get the row numbers out of the plot: I want the species position and
> the environmental variables in it as vectors but not the station
> numbers. How do I get them out? 

Is this in vegan? If so, if obj contains your fitted cca model, then

plot(obj, display = c("species","bp"))

(or, if you have centroids for factor variables as well)

plot(obj, display = c("species","bp","cn"))

If you only want to plot the points rather than the labels, add argument
'type' to the call setting it to "p", e.g.:

plot(obj, display = c("species","bp"), type = "p")

> 
> I have a raw species data set and a raw environmental data set and I
> don´t have station names or numbers in the data set but R puts the row
> names in anyway. I understand they are necessary but I just don´t want
> to show them in the biplot.

All of this (and more) is explained in ?plot.cca (if you are talking
about vegan::cca)

You might also like to look at ?orditkplot (which allows you to move the
labels around yourself to get a clear plot) and ?orditorp with which you
can set a priority for certain sites to be labelled with text whilst
points are used for those sites that would cause text labels to overlap.

HTH

G

> 
> Thank you!
> 
> Yours sincerely 
> Heta Rousi ( Finnish environment institute, Marine center)
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