ExponentialMovingAverage(EMA)

[hhh ggg]

Does anyone know:
What is multiplier value in the default EMA function?
How to set the multiplier in the EMA function?

EMA = Closing price x multiplier + EMA (previous day) x (1-multiplier)

https://www.backtrader.com/docu/indautoref/#exponentialmovingaverage

[run-out]

Have a look at the code it might help.

class ExponentialMovingAverage(MovingAverageBase):
    '''
    A Moving Average that smoothes data exponentially over time.
    It is a subclass of SmoothingMovingAverage.
      - self.smfactor -> 2 / (1 + period)
      - self.smfactor1 -> `1 - self.smfactor`
    Formula:
      - movav = prev * (1.0 - smoothfactor) + newdata * smoothfactor
    See also:
      - http://en.wikipedia.org/wiki/Moving_average#Exponential_moving_average
    '''
    alias = ('EMA', 'MovingAverageExponential',)
    lines = ('ema',)

    def __init__(self):
        # Before super to ensure mixins (right-hand side in subclassing)
        # can see the assignment operation and operate on the line
        self.lines[0] = es = ExponentialSmoothing(
            self.data,
            period=self.p.period,
            alpha=2.0 / (1.0 + self.p.period))

        self.alpha, self.alpha1 = es.alpha, es.alpha1

        super(ExponentialMovingAverage, self).__init__()

[hhh ggg]

@run-out Thank you!!! :)