trophic_differences#

trophic_differences(G, weight='weight')[source]#

Compute the trophic differences of the edges of a directed graph.

The trophic difference $x_{i}j$ for each edge is defined in Johnson et al. [1] as:

$$x_{i}j=s_j-s_i$$

Where $s_i$ is the trophic level of node $i$.

Parameters:

GDiGraph

A directed networkx graph

Returns:

diffsdict

Dictionary of edges with trophic differences as the value.

References

[1]

Samuel Johnson, Virginia Dominguez-Garcia, Luca Donetti, Miguel A. Munoz (2014) PNAS “Trophic coherence determines food-web stability”