def merge(self, cluster_ids=None, to=None):
        """Merge the selected clusters."""
        if cluster_ids is None:
            cluster_ids = self.selected
        if len(cluster_ids or []) <= 1:
            return
        self.clustering.merge(cluster_ids, to=to)
        self._global_history.action(self.clustering)
def merge ( self , cluster_ids = None , to = None ) : if cluster_ids is None : cluster_ids = self . selected if len ( cluster_ids or [ ] ) <= 1 : return self . clustering . merge ( cluster_ids , to = to ) self . _global_history . action ( self . clustering )
Merge the selected clusters.