The strategy doesn't execute

[analyticray]

I have sample data as follows:

I would like to execute the buy when StartTrade is > 0 and close the position (sell) when endTrade >0. However, the strategy doesn't execute all (no trades) when I execute the following code:

class SmaCross(Strategy):

def init(self):
    # Precompute the two moving averages
    self.starTrade = self.data.starTrade 
    self.EndTrade = self.data.EndTrade 

def next(self): 
    if (self.starTrade[-1] > 0): 
        self.position.close()
        self.buy()

    elif (self.position and self.EndTrade[-1] > 0): 
        self.position.close()
        self.sell()

Can you please advise on what went wrong?

Thanks.

[kernc]

If you print(self.starTrade), you'll see its length isn't incremented throughout the run, rather it stays the initial size. However, print(self.data.starTrade) would show incremented in next() since Strategy.data is.

Therefore, either of these should work:

    def init(self):
        # Make it an indicator. Indicators' lengths are auto-incremented
        self.starTrade = self.I(lambda: self.data.starTrade)

or:

    def next(self):
        # Strategy.data is auto-incremented
        if self.data.starTrade[-1] > 0:
            ...

And the same for the other one.