Recursive indicator

[BT.chuck]

Hi there,

I am new to bt and need some help. I want self.move to be a trend indicator, and want its value always be the last non-zero value after triggering.

    def __init__(self):

        # keep track of close price in the series
        self.data_close = self.datas[0].close


        # keep track of pending orders/buy price/buy commission
        self.order = None
        self.price = None
        self.comm = None
        self.move = bt.LineNum(0.0)

        # add Bollinger Bands indicator and track the buy/sell signals
        self.b_band = bt.ind.BollingerBands(self.data_close, period=self.p.period, devfactor=self.p.devfactor)
        self.upbot = bt.ind.CrossOver(self.data_close, self.b_band.lines.bot)
        self.downtop = bt.ind.CrossOver(self.data_close, self.b_band.lines.top)
        self.move = bt.If(self.upbot>0, 1, bt.If(self.upbot<0, -2, bt.If(self.downtop<0, -1, self.move(-1))))

Currently, it returns the following result to me

uptop: -1.0, downtop: 0.0, move: -2.0
uptop: 1.0, downtop: 0.0, move: 1.0
uptop: 0.0, downtop: 0.0, move: 0.0
uptop: 0.0, downtop: 0.0, move: 0.0

What I wanted is

uptop: -1.0, downtop: 0.0, move: -2.0
uptop: 1.0, downtop: 0.0, move: 1.0
uptop: 0.0, downtop: 0.0, move: 1.0
uptop: 0.0, downtop: 0.0, move: 1.0

Please help! Thank you in advance!