loop (version 1.1)

uniquepaths: enumerate all unique food chains that are linked to a given species/node

Description

the food chains can allow circles/loop. This function will return all unique food chains that involved the focused species as a node , and the duplicated chains are deleted. It is recommended to use rather than the function 'pathways'.

Usage

uniquepaths(gemat, sp)

Arguments

gemat

standard square graph matrix

sp

the species you want to search.

Value

return a list showing all food chains by presenting each node in that chain. Also, the weights for each link will be returned as well.

References

Chen Y (2012) loop: an R package for performing decomposition of weighted directed graphs, food web analysis and flexible network plotting. Submitted.

See Also

pathways

Examples

mat=matrix(c(0,5,3,7,0,5,0,8,0,4,3,8,0,1,6,7,0,1,0,2,0,4,6,2,0),5,5)
uniquepaths(mat,sp=2)