100% in the market strategy

[blonc]

I seem to be having a hard time building a strategy that is long/short 100% of the time. I will try to give as much info as I can think of that is needed for help, if you need more info just let me know.

       #this is called to place first order, i put one , but it still places 2 trades (see logs
        if self.position.size == 0:
            if self.buy_sig:
                self.buy(size=1)
            elif self.sell_sig:
                self.sell(size=1)

        #signal to buy
        if self.position.size <= 0:
            if self.buy_sig:
                self.buy()
        #signal to sell
        if self.position.size >= 0:
            if self.sell_sig:
                self.sell()

I am using a sizer to reverse the order:
cerebro.addsizer(bt.sizers.FixedReverser, stake=1)

this is what the output log looks like to better help describe the needed results:

2016-01-06, Buy Sig nan Sell Sig nan Position 0
2016-01-06, Buy Sig 1.0 Sell Sig 0.0 Position 0
2016-01-06, Buy Sig 1.0 Sell Sig 0.0 Position 2
2016-01-06, Buy Sig 1.0 Sell Sig 0.0 Position 2
2016-01-07, Buy Sig 1.0 Sell Sig 0.0 Position 2
2016-01-07, Buy Sig 0.0 Sell Sig 0.0 Position 2
2016-01-07, Buy Sig 0.0 Sell Sig 0.0 Position 2
2016-01-07, Buy Sig 0.0 Sell Sig 1.0 Position 2
2016-01-07, Buy Sig 0.0 Sell Sig 1.0 Position 0
2016-01-07, Buy Sig 0.0 Sell Sig 1.0 Position -2
2016-01-07, Buy Sig 0.0 Sell Sig 1.0 Position -2
2016-01-07, Buy Sig 0.0 Sell Sig 1.0 Position -2
2016-01-07, Buy Sig 0.0 Sell Sig 1.0 Position -2

the problems

• when i enter my first trade, even with size set it still places a size order of 2, trying to reverse the order
  *when looking at the logs you can see we have a position of +2 and when the sell signal comes in it skips a 'line' then places the trade the next line. what is needed to be done to get that to flip from +2 to -2 in the same line?

[ab_trader]

For buy signal your code issues buy order twice - in the first if and in the second if. This is a reason why you have position equal 2. In order to avoid this you need to make it as follows:

       #this is called to place first order, i put one , but it still places 2 trades (see logs
        if self.position.size == 0:
            if self.buy_sig:
                self.buy(size=1)
            elif self.sell_sig:
                self.sell(size=1)

        #signal to buy
        if self.position.size < 0:
            if self.buy_sig:
                self.buy()
        #signal to sell
        if self.position.size > 0:
            if self.sell_sig:
                self.sell()

[blonc]

that solved both problems, i see the mistake now. silly clearly. thank you for the help =)

2016-01-06, Buy Sig nan Sell Sig nan Position 0
2016-01-06, Buy Sig nan Sell Sig nan Position 0
2016-01-06, Buy Sig nan Sell Sig nan Position 0
2016-01-06, Buy Sig 1.0 Sell Sig 0.0 Position 0
2016-01-06, Buy Sig 1.0 Sell Sig 0.0 Position 1
2016-01-06, Buy Sig 1.0 Sell Sig 0.0 Position 1
2016-01-06, Buy Sig 1.0 Sell Sig 0.0 Position 1
2016-01-07, Buy Sig 0.0 Sell Sig 0.0 Position 1
2016-01-07, Buy Sig 0.0 Sell Sig 0.0 Position 1
2016-01-07, Buy Sig 0.0 Sell Sig 1.0 Position 1
2016-01-07, Buy Sig 0.0 Sell Sig 1.0 Position -1
2016-01-07, Buy Sig 0.0 Sell Sig 1.0 Position -1
2016-01-07, Buy Sig 0.0 Sell Sig 1.0 Position -1
2016-01-07, Buy Sig 0.0 Sell Sig 1.0 Position -1
2016-01-07, Buy Sig 0.0 Sell Sig 1.0 Position -1
2016-01-07, Buy Sig 0.0 Sell Sig 1.0 Position -1