docs: fix doctests

Author: alexfikl

nodepy/graph.py

@@ -43,7 +43,13 @@ def rk_dependency_graph(rkm):
     s = len(rkm)
     K = np.zeros((s+1,s+1))
     K[:,:-1] = np.vstack((rkm.A,rkm.b))
-    G = nx.from_numpy_matrix(np.abs(K.T)>0,nx.DiGraph())
+
+    try:
+        G = nx.from_numpy_matrix(np.abs(K.T)>0,nx.DiGraph())
+    except AttributeError:
+        # NOTE: networkx v3.0 removed from_numpy_matrix
+        G = nx.from_numpy_array(np.abs(K.T)>0, create_using=nx.DiGraph)
+
     return G
 
 def _longest_paths(G):

nodepy/low_storage_rk.py

@@ -46,7 +46,7 @@
     >>> myrk = lsrk.load_low_storage('DDAS47')
     >>> print(myrk)
     DDAS4()7[2R]
-    2R Method of Tselios \& Simos (2007)
+    2R Method of Tselios & Simos (2007)
      0.000 |
      0.336 | 0.336
      0.286 | 0.094  0.192

nodepy/runge_kutta_method.py

@@ -204,14 +204,14 @@ def latex(self):
                 >>> print(merson.latex())
                 \begin{align}
                 \begin{array}{c|ccccc}
-                    &  &  &  &  & \\
+                 &  &  &  &  & \\
                 \frac{1}{3} & \frac{1}{3} &  &  &  & \\
                 \frac{1}{3} & \frac{1}{6} & \frac{1}{6} &  &  & \\
                 \frac{1}{2} & \frac{1}{8} &  & \frac{3}{8} &  & \\
                 1 & \frac{1}{2} &  & - \frac{3}{2} & 2 & \\
                 \hline
-                    & \frac{1}{6} &  &  & \frac{2}{3} & \frac{1}{6}\\
-                    & \frac{1}{10} &  & \frac{3}{10} & \frac{2}{5} & \frac{1}{5}
+                 & \frac{1}{6} &  &  & \frac{2}{3} & \frac{1}{6}\\
+                 & \frac{1}{10} &  & \frac{3}{10} & \frac{2}{5} & \frac{1}{5}
                 \end{array}
                 \end{align}
         """