ThreeNodeChains: Three-node chains

In cheddar: Analysis and Visualisation of Ecological Communities

Three-node chains

Description

Enumerates every three-node chain in a food web.

Usage

ThreeNodeChains(community, exclude.loops=FALSE, node.properties=NULL, 
                chain.properties=NULL)

Arguments

community	an object of class Community.
exclude.loops	logical - should loops A -> B -> A be included?
node.properties	the names of the node properties to return. Should meet the criteria of the properties parameter of NPS.
chain.properties	the names of chain properties to return.

Details

Enumerates every three-node chain in the food-web and returns a data.frame containing the columns bottom, intermediate and top and any requested node and trophic-link columns.

Value

A data.frame.

Author(s)

Lawrence Hudson

See Also

TLPS, TrophicChains

Examples

data(TL84)

nrow(ThreeNodeChains(TL84))
nrow(ThreeNodeChains(TL84, exclude.loops=TRUE))

# bottom, intermediate and top
head(ThreeNodeChains(TL84))

# bottom, intermediate, top, bottom.M, intermediate.M and top.M
head(ThreeNodeChains(TL84, node.properties='M'))

# As above with the addition of bottom.N, intermediate.N and top.N
head(ThreeNodeChains(TL84, node.properties=c('M','N')))

cheddar documentation built on Sept. 1, 2022, 5:06 p.m.