find out the food chain with shortest length among all food chains that are linked to a given species
not including self-loop (i.e., the node itself as a chain)
standard square graph matrix
the node/species you want to search
Youhua Chen <firstname.lastname@example.org>
Chen Y (2012) loop: an R package for performing decomposition of weighted directed graphs, food web analysis and flexible network plotting. Submitted.
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