Universe indicator automatic update or manual update?

Hi Li Cheng,
When using the helper function to create an indicator, the indicator is created and hooked to automatic updates at the given resolution. Refer to the following docs for more information. We also recommend going through the following example algorithm.
Best,
Varad Kabade

Hi Varad, thanks for answering my question! I've tried to use the automatic update function for a basic MACD strategy for SPY, for some reason, the algorithm isn't placing any trades. I've tried to debug it with self.Debug(self.macd[symbol].Current.Value) in OnData but no value shows up, can you advise me on what changes I should make to the algorithm?

Hi Li Cheng

The indicator warm-up and auto-update subscription is correctly set up. The reason for no trade in this backtest is because there is no symbol returned from FineSelectionFunction:

• CoarseSelectionFunction must return Symbol object
• Symbol object is not the same as symbol string, which has to be fetched by Symbol.Value
• "SPY" has no fundamental data

The following should work for SPY, we also included a backtest using AAPL for the same mechanism.

# initialize
self.userlist = ["SPY"]      #User list
self.AddUniverse(self.CoarseSelectionFunction)

def CoarseSelectionFunction(self, coarse):
   symbols = [x.Symbol for x in coarse if x.Symbol.Value in self.userlist]
   return symbols

Best
Louis

Hi Louis, thanks for the reply! 

I was dumb, should've noticed that no symbols were returned from Fine selection and that SPY didn't have fundamentals. But I learned something new from your reply, that only symbols with fundamentals are returned from Fine selection, and that coarse selection allows the return of symbols even if they didn't have fundamentals.

I suppose that another way to do this with SPY would be to use the AddEquity function for SPY in initialize.

Hi Li Cheng,
Yes, you are right; we can manually add spy in the Initialize method; also as we are not doing any fine filtering we can just use the coarse filter function suggested by Louis which will also add spy in the universe.
Best,
Varad Kabade

Hi Varad, really appreciate the clarification! Thanks a bunch!