--- a/c/Motion.cpp	Fri Dec 16 11:34:07 2011 -0500
+++ b/c/Motion.cpp	Tue Dec 20 00:31:37 2011 -0500
@@ -217,12 +217,16 @@
   return featureGroups;
 }
 
-string FeatureGraph::informationString(void) {
+string FeatureGraph::informationString(void) const {
   stringstream ss;
   ss << num_vertices(graph) << " vertices, " << num_edges(graph) << " edges";
   return ss.str();
 }
 
+int FeatureGraph::getNVertices(void) const { return num_vertices(graph);}
+
+int FeatureGraph::getNEdges(void) const  { return num_edges(graph);}
+
 void FeatureGraph::computeVertexIndex(void) {
   graph_traits<FeatureGraph::UndirectedGraph>::vertex_iterator vi, vend;
   graph_traits<FeatureGraph::UndirectedGraph>::vertices_size_type cnt = 0;