plot.vf {ecodist} | R Documentation |
Add vector fitting arrows to an existing ordination plot.
## S3 method for class 'vf': plot(x, pval = 1, cex = 0.8, ascale = 0.9, ...)
x |
an object of S3 class vf , created by vf() |
pval |
optional, critical p-value for choosing variables to plot |
cex |
text size |
ascale |
optional, proportion of plot area to use when calculating arrow length |
... |
optional, other graphics parameters |
Adds arrows to an existing ordination plot. Only arrows with a p-value less than pval are added. By default, all variables are shown.
Sarah Goslee, Sarah.Goslee@ars.usda.gov
## Not run: # Example of multivariate analysis using built-in iris dataset data(iris) iris <- iris[seq(1, 150, by=3),] iris.md <- distance(iris[,1:4], "mahal") # Minimum-stress 2-dimensional nonmetric multidimensional scaling configuration # Uses small number of separate ordinations (5) to increase speed of example. # Use more for final analysis. iris.nmds <- nmds(iris.md, mindim=2, maxdim=2, nits=3) iris.nmin <- nmds.min(iris.nmds) # Plot NMDS result with symbols denoting species plot(iris.nmin, pch=as.numeric(iris[,5])) # Fit vectors for the main variables to the NMDS configuration iris.vf <- vf(iris.nmin, iris[,1:4], nperm=10) plot(iris.vf, col="blue") ## End(Not run)