Table 2

Brief overview of different types of network concepts.

Input Matrix
Type of Concept
Example: Connectivity

A - I
fundamental
Connectivityi(A - I) = ∑jiaij
ACF - I = CF CFτ - diag(CF2)
CF-based
Connectivityi(ACF - I) = CFijiCFj
ACF,app = CF CFτ
approximate CF-based
Connectivityi(ACF,app) = CFijCFj

A network concept arises by evaluating a network concept function on a special type of input matrix. We assume that the diagonal elements of the matrix A - I are 0.

Dong and Horvath BMC Systems Biology 2007 1:24   doi:10.1186/1752-0509-1-24