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Fig. 3.4 Modeling social network using graph and representing it using incidence and adjacency
matrix
Fig. 3.5 Directed and undirected unweighted graph of the one-mode social network and its
representation using binary matrices
Fig. 3.6 Directed and undirected weighted graph of the one-mode social network and its repre-
sentation using binary matrices
Fig. 3.7 Weighted and unweighted graph of the two-mode social network and its representation
using binary matrices
Using the previous paragraphs, we may distinguish between the matrices of one-
mode networks (all objects are of the same type, see Figs.
3.5
and
3.6
) and two-
mode networks (objects can be divided into two groups, see Fig.
3.7
).
The relation between objects can be considered (according to various needs) as
reflexive or not (if object A has relation to object B, has also the object B relation to
object A?). This leads to directed or undirected graphs (see left and right parts of
Figs.
3.5
and
3.6
).
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