Fixed issues in the prepare_chunk logic

catalyst/examples/simple_loop.py

@@ -20,7 +20,7 @@ def handle_data(context, data):
         context.asset,
         fields='price',
         bar_count=15,
-        frequency='1d'
+        frequency='1m'
     )
     rsi = talib.RSI(prices.values, timeperiod=14)[-1]
     print('got rsi: {}'.format(rsi))
@@ -31,7 +31,7 @@ run_algorithm(
     capital_base=250,
     start=pd.to_datetime('2017-08-01', utc=True),
     end=pd.to_datetime('2017-9-30', utc=True),
-    data_frequency='daily',
+    data_frequency='minute',
     initialize=initialize,
     handle_data=handle_data,
     analyze=None,