output file header uses element symbols

Author: tang070205

src/measure/rdf.cu

@@ -214,10 +214,22 @@ void RDF::postprocess(
 
   FILE* fid = fopen("rdf.out", "a");
 
+  std::vector<std::string> type_symbols(rdf_para.num_types);
+  for (int a = 0; a < rdf_para.num_types; a++) {
+    int type_idx = rdf_para.type_index[a];
+    for (int n = 0; n < atom.number_of_atoms; n++) {
+      if (atom.cpu_type[n] == type_idx) {
+        type_symbols[a] = atom.cpu_atom_symbol[n];
+        break;
+      }
+    }
+  }
+
   fprintf(fid, "#radius total");
   for (int a = 0; a < rdf_para.num_types; a++) {
     for (int b = a; b < rdf_para.num_types; b++) {
       fprintf(fid, " type_%d_%d", rdf_para.type_index[a], rdf_para.type_index[b]);
+      fprintf(fid, " %s-%s", type_symbols[a].c_str(), type_symbols[b].c_str());
     }
   }
   fprintf(fid, "\n");