some more error handling

src/graphm/experiment.cpp

@@ -107,6 +107,11 @@ void experiment::run_experiment(graph &g, graph &h)
     int N2 =0;
     N2 = h.get_adjmatrix()->size1;
     // Matrix of local similarities between graph vertices
+    if ( N1==0)
+    	throw std::runtime_error("Error: graph g has adjacency matrix of 0 size \n");
+    if ( N2==0)
+    	throw std::runtime_error("Error: graph h has adjacency matrix of 0 size \n");
+
     gsl_matrix* gm_ldh=gsl_matrix_alloc(N1,N2);
 
 

src/graphmatch_rcpp.cpp

@@ -116,6 +116,7 @@ Rcpp::List run_graph_match(const RcppGSL::Matrix& A, const RcppGSL::Matrix& B, c
   try {
 
   	exp.run_experiment(graphm_obj_A, graphm_obj_B);
+  	Rcpp::Rcout <<"GM Experiments complete\n";
 
   	int exp_count = exp.get_algo_len();