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src/topupopt/problems/esipp/network.py

@@ -1256,6 +1256,31 @@ class Network(nx.MultiDiGraph):
 
             return nx.is_tree(network_view)
 
+    # *************************************************************************
+    # *************************************************************************
+    
+    def has_selected_antiparallel_arcs(self) -> bool:
+        "Returns True if any two nodes have selected arcs in both directions."
+        return len(self.find_selected_antiparallel_arcs()) != 0
+
+    # *************************************************************************
+    # *************************************************************************
+    
+    def find_selected_antiparallel_arcs(self) -> list:
+        """Returns True if any two nodes have (selected) forward and reverse arcs."""
+        
+        # check the existence of forward and reverse arcs in the same segment
+        arcs = [  # get the arcs selected
+            arc_key[0:2]
+            for arc_key in self.edges(keys=True)
+            if True in self.edges[arc_key][Network.KEY_ARC_TECH].options_selected
+        ]
+        arcs = [  # get the selected arcs that exist both ways
+            arc_key
+            for arc_key in arcs
+            if (arc_key[1], arc_key[0]) in arcs
+        ]
+        return arcs
 
 # *****************************************************************************
 # *****************************************************************************