help using indicators

[Wayne Filkins]

I'm trying to figure out how to use indicators, specifically Fractals(). How do we know how many arguments to use and what to use as arguments for each indicator? I tried

self.fractalTest = bt.studies.Fractal(self.dataclose)

but got an error: AttributeError: 'Lines_LineSeries_LineSeriesStub' object has no attribute 'high'

Even if I do get it working, when I look at the Fractals class, I don't understand what to pass as parameters. I tried this with indicators which I have used successfully like sma and I don't understand where the parameters get used and how to figure out how many and what to set them as?

[run-out]

@Wayne-Filkins Try passing in the full datas line, so:

def __init__(self):
    self.myfrac = bt.studies.Fractal(self.datas[0])

And call the values like this.

def next(self):
    self.log(
        f"Bearish {self.myfrac.fractal_bearish[0]:9.2f}, Bullish {self.myfrac.fractal_bullish[0]:9.2f}"
    )