ordcomp {labdsv}R Documentation

Ordination to Dissimilarity Comparison

Description

Plots the distribution of pair-wise distances of all points in an ordination to the distances in the dissimilarity or distance matrix the ordination was calculated from. Prints the correlation between the two on the graph.

Usage

ordcomp(x,y,dim=2,xlab="Computed Distance",ylab="Ordination Distance",
            title="",pch=1)

Arguments

x an object of class dist
y an ordination object from pca, pco, nmds, fso
dim the number of dimensions in the ordination to use (default=2)
xlab the X axis label for the graph
ylab the Y axis label for the graph
title a title for the plot
pch the symbol to plot

Value

a plot is created on the current graphics device

Note

Ordinations are low dimensional representations of multidimensional spaces. This function attempts to portray how well the low dimensional solution approximates the full dimensional space.

Author(s)

David W. Roberts droberts@montana.edu http://ecology.msu.montana.edu/droberts

References

http://ecology.msu.montana.edu/labdsv/R

Examples

data(bryceveg) # produces a vegetation dataframe
dis.bc <- dsvdis(bryceveg,'bray/curtis') # creates a Bray/Curtis dissimilarity matrix
pco.bc <- pco(dis.bc,2) # produces a two-dimensional Principal Coordinates Ordination object
ordcomp(pco.bc,dis.bc)

[Package labdsv version 1.2-2 Index]