cleaner printing

gtsam/hybrid/HybridFactor.cpp

@@ -98,8 +98,12 @@ void HybridFactor::print(const std::string &s,
       std::cout << (discreteKeys_.size() > 0 ? "; " : "");
     }
   }
-  for (auto &&discreteKey : discreteKeys_) {
-    std::cout << " " << formatter(discreteKey.first);
+  for (size_t d = 0; d < discreteKeys_.size(); d++) {
+    std::cout << formatter(discreteKeys_.at(d).first);
+    if (d < discreteKeys_.size() - 1) {
+      std::cout << " ";
+    }
+    
   }
   std::cout << "]";
 }