NvMConvexHull {cheddar} | R Documentation |
NvMConvexHull
Description
Compute the convex hull around log-transformed $N$ versus $M$ data.
Usage
NvMConvexHull(community)
Arguments
community |
an object of class |
Details
Returns the points and area of the minimum convex hull (a polygon in log10-transformed numerical abundance versus log10-transformed body mass space) that bounds all the species within the community.
Value
A list
containing the values
nodes |
The names of the nodes that make up the convex hull. |
points |
A matrix containing columns ‘x’ and ‘y’ that contain the coordinates of the points that make up the convex hull. |
area |
The area within the convex hull. |
Author(s)
Lawrence Hudson
References
Leaper, R. and Raffaelli, D. (1999) Defining the abundance body-size constraint space: data from a real food web. Ecology Letters 2, 3, 191–199.
See Also
Examples
data(TL84)
# Compute convex hull
convex.hull <- NvMConvexHull(TL84)
# The nodes that form the hull
convex.hull$nodes
# The area of the hull
convex.hull$area
# Plot the hull in red around the nodes
PlotNvM(TL84)
polygon(convex.hull$points, lwd=2, border='red')
[Package cheddar version 0.1-639 Index]