Sunday, September 20, 2015

Custom Labels for Ordination Diagram

Here is how you do custom labels, hull, spider in a vegan ordination diagram: 


library(vegan)

### data on 35 species of Oribatid mites
### data description at: http://cc.oulu.fi/~jarioksa/softhelp/vegan/html/mite.html
data(mite)

### ...and environmental variables
data(mite.env)

### the factor which you wish to use for labeling the displayed sites
### in the ordination diagramm:
fac<-mite.env$Topo
sol<-metaMDS(mite)

windows(9,5)
par(mfrow=c(1,2))

### graph with "spider":
plot(sol,type="n")
points(sol, display = "sites", cex=0.65, select=which(fac=="Hummock"),
       pch = 21,col="black", bg="black")
points(sol, display = "sites", cex=0.65, select=which(fac=="Blanket"),
       pch = 21,col="black", bg="white")
ordihull(sol,group=fac,show.groups="Hummock")
ordihull(sol,group=fac,show.groups="Blanket",lty=3)
orditorp(sol, dis = "sp", pcex=0,air=0.85,col="grey35",cex=0.8 ,font=3)

### graph with "hull":
plot(sol,type="n")
points(sol, display = "sites", cex=0.65, select=which(fac=="Hummock"),
       pch = 21,col="black", bg="black")
points(sol, display = "sites", cex=0.65, select=which(fac=="Blanket"),
       pch = 21,col="black", bg="white")
ordispider(sol,group=fac,show.groups="Hummock")
ordispider(sol,group=fac,show.groups="Blanket",lty=3)
orditorp(sol, dis = "sp", pcex=0,air=0.85,col="grey35",cex=0.8 ,font=3)

R package ‘vegan’ citation: Jari Oksanen, F. Guillaume Blanchet, Roeland Kindt, Pierre Legendre,
R. B. O'Hara, Gavin L. Simpson, Peter Solymos, M. Henry H. Stevens
and Helene Wagner (2011). vegan: Community Ecology Package. R package
version 1.17-9. http://CRAN.R-project.org/package=vegan

See also:
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