Vertex Clustering Coefficient

For a vertex of a simple, connected Undirected Graph:

$$cc(v):=\{\begin{array}{ll}\frac{m_v}{\left(\begin{array}{c}{n}_v\\ 2\end{array}\right)}=\frac{2m_v}{n_v\left(n_v-1\right)}& \text{ if }\delta (v)>1\\ \text{ undefined }& \text{ otherwise }\end{array}$$