small bug fix

python/mlmc_mppy.py

@@ -89,7 +89,7 @@ class MLMCMpp(Mpp):
     def parse_mlmc_table(self, log_content):
         float_pattern = self.create_float_pattern()
 
-        columns = ["eps", "value", "MLMC cost", "MC cost", "l", "M"]
+        columns = ['eps', 'value', 'MLMC cost', 'MC cost', 'l', 'M']
         df = pd.DataFrame(columns=columns)
 
         ctr = 0
@@ -219,8 +219,8 @@ class MLMCMpp(Mpp):
             self.plot_convergence_table(df, axes, label)
 
         if plot_name is not None:
-            path = self.PROJECT_PY_DATA_DIR + 'Convergence_{}_{}.png'.format(plot_name,
-                                                                             self.now)
+            path = self.PROJECT_PY_DATA_DIR + '/Convergence_{}_{}.png'.format(plot_name,
+                                                                              self.now)
             plt.savefig(path)
         else:
             plt.show()
@@ -264,7 +264,7 @@ class MLMCMpp(Mpp):
         return df
 
     def print_convergence_table(self, df=None):
-        self.create_convergence_table_from_log(df)
+        df = self.create_convergence_table_from_log(df)
         self.prepare_pd_table()
         print(df)
 
@@ -274,10 +274,10 @@ class MLMCMpp(Mpp):
         print(df)
 
     def save_convergence_table(self, df=None, table_name=None):
-        self.create_convergence_table_from_log(df)
-        path = self.PROJECT_PY_DATA_DIR + 'Convergence_{}_{}.csv'.format(table_name,
-                                                                         self.now)
-        df.to_csv(path)
+        df_ = self.create_convergence_table_from_log(df)
+        path = self.PROJECT_PY_DATA_DIR + '/Convergence_{}_{}.csv'.format(table_name,
+                                                                          self.now)
+        df_.to_csv(path)
 
     def save_mlmc_table(self, df, table_name=None):
         self.create_mlmc_table(df)