(self, idx)
return self._graph.subgraph(self[idx])
Get the subgraph belonging to a given cluster.

        Precondition: the vertex set of the graph hasn't been modified since the
        moment the cover was constructed.

        @param idx: the cluster index
        @return: a copy of the subgraph
Get the subgraph belonging to a given cluster.
Get the subgraph belonging to a given cluster .
def subgraph(self, idx):
        """Get the subgraph belonging to a given cluster.

        Precondition: the vertex set of the graph hasn't been modified since the
        moment the cover was constructed.

        @param idx: the cluster index
        @return: a copy of the subgraph
        """
        return self._graph.subgraph(self[idx])
def subgraph ( self , idx ) : return self . _graph . subgraph ( self [ idx ] )