Replace pd.as_matrix by pd.values

See GH18458（pandas-dev/pandas#18458). Since as_matrix is deprecated for pd.DataFrame and pd.Series, use data.values instead.

Author: atangfan

environment.py

@@ -82,7 +82,7 @@ def load_data(self):
         returns=pd.read_csv(self.returns, index_col=0)
         assets=np.array(returns.columns)
         dates=np.array(returns.index)
-        returns=returns.as_matrix()
+        returns=returns.values()
         return pd.DataFrame(prices, 
              columns = assets,
              index = dates
@@ -124,4 +124,4 @@ def local_portfolio(returns, weights):
         rew = np.array([rew] * len(self.data.columns))
 
         return np.dot(returns, weights), rew
-        
+