Bugfix - Correct plot and is_connected

Fix betweenness_distribution (and therefore docs)
Also correct is_connected with nngt backend.

.build.yml

@@ -6,7 +6,7 @@ secrets:
     - 0b249c79-8eaf-4b82-b1d1-f3c38c7eae4b
 tasks:
     - check: |
-        mv .coveralls.yml NNGT/.coveralls.yml 2>/dev/null
+        mv .coveralls.yml NNGT/.coveralls.yml || true
         cd NNGT
         python3 extra/check_headers.py
     - setup: |

nngt/core/nngt_graph.py

@@ -491,19 +491,19 @@ def is_connected(self, mode="strong"):
             Whether to test connectedness with directed ("strong") or
             undirected ("weak") connections.
         '''
-        num_nodes = g.node_nb()
+        num_nodes = self.node_nb()
 
         # get adjacency matrix
-        A = g.adjacency_matrix()
+        A = self.adjacency_matrix()
 
-        if mode == "weak" and g.is_directed():
+        if mode == "weak" and self.is_directed():
             A = A + A.T
 
         visited = _dfs(A, 0)
 
         if len(visited) != num_nodes:
             return False
-        elif mode == "strong" and g.is_directed():
+        elif mode == "strong" and self.is_directed():
             visited = _dfs(A.T, 0)
 
             if len(visited) != num_nodes:

nngt/plot/plt_properties.py

@@ -320,7 +320,7 @@ def betweenness_distribution(
         axes = [ax1.twinx()]
 
         if num_axes == 2:
-            ax2 = ax.twiny()
+            ax2 = ax1.twiny()
             axes.append(ax2)
             ax1.grid(False, axis='x')
             ax1.yaxis.tick_right()