Three Hundred - Forty-Four Commit: Implement directed-graph-demo

Author: AAdewunmi

Section_12(Graphs)/(1)_graph.py

@@ -85,7 +85,7 @@ def edges_print(self):
     def outdegree(self, v):
         count = 0
         for j in range(self._vertices):
-            if self._adjacent_matrix[v][j] != 0:
+            if not self._adjacent_matrix[v][j] != 0:
                 count = count + 1
         return count
 

Section_12(Graphs)/directed-graph-demo.py

@@ -0,0 +1,25 @@
+from graph import Graph
+
+G = Graph(4)
+G.display_adjacent_matrix()
+print('Vertices:', G.vertex_count())
+print('Edges:', G.edge_count())
+G.edges_print()
+G.insert_edge(0,1)
+G.insert_edge(0,2)
+G.insert_edge(1,2)
+G.insert_edge(2,3)
+G.display_adjacent_matrix()
+print('Vertices:', G.vertex_count())
+print('Edges:', G.edge_count())
+G.edges_print()
+print('Edge 1 - 3', G.exist_edge(1,3))
+print('Edge 1 - 2', G.exist_edge(1,2))
+print('Indegree 2', G.indegree(2))
+print('Outdegree 2', G.outdegree(2))
+print('Graph Adjacency Matrix')
+G.display_adjacent_matrix()
+G.remove_edge(1,2)
+print('Graph Adjacency Matrix')
+G.display_adjacent_matrix()
+print('Edges between 1--2:', G.exist_edge(1,2))

Section_12(Graphs)/graph.py

@@ -39,7 +39,7 @@ def edges_print(self):
     def outdegree(self, v):
         count = 0
         for j in range(self._vertices):
-            if self._adjacent_matrix[v][j] != 0:
+            if not self._adjacent_matrix[v][j] != 0:
                 count = count + 1
         return count