%%%
%%% node_activity
%%%
\myprogram{{node\_activity.py}}
          {compute the activity of the nodes of a multiplex, i.e. the
            number of layers where each node is not isolated.}
          {$<$layer1$>$ [$<$layer2$>$ ...]}

\mydescription{Compute and print on output the activity of the nodes
  of a multiplex network, whose layers are given as input in the files
  \textit{layer1}, \textit{layer2}, etc.
  
  Each file contains the (undirected) edge list of a layer, and each
  line is in the format:
  
  \hspace{0.5cm}\textit{src\_ID} \textit{dest\_ID}
  
  where \textit{src\_ID} and \textit{dest\_ID} are the IDs of the two
  endpoints of an edge.}

\myreturn{A list of lines, where the n-th line is the value of activity
  of the n-th node, starting from \textbf{0}.}

\myreference{\refcorrelations}