# ordneighbors: Nearest Neighbors Plotted in Ordination Space In labdsv: Ordination and Multivariate Analysis for Ecology

## Description

For each sample unit in an ordination, for each of n nearest neighbors, draws an arrow from the sample unit to its n neighbors.

## Usage

 1 ordneighbors(ord,dis,numnbr=1,ax=1,ay=2,digits=5,length=0.1)

## Arguments

 ord an ordination object of class ‘dsvord’ from pca, pco, nmds, fso dis an object of class dist numnbr the number (order) of nearest neighbors to plot ax the dimension t plot on the X axis ay the dimension to plot on the y axis digits the number of digits to report length the length of the arrowhead

## Value

Additional information is plotted on an existing ordination and summary information is printed. Returns an (invisible) list of summary values.

## Note

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

If numnbr = 1 and there are ties the function plots arrows for all tied values. If n > 1 the function draws arrows for all values with rank <= n.

## References

http://ecology.msu.montana.edu/labdsv/R/labs/lab9/lab9.html

## Examples

 1 2 3 4 5 6 7 data(bryceveg) # produces a vegetation data.frame 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 plot(pco.bc) ordneighbors(pco.bc,dis.bc)

labdsv documentation built on Aug. 4, 2019, 5:03 p.m.