fixing sigma calc on empty period.
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@ -45,7 +45,7 @@ func (ema EMASeries) Len() int {
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// GetSigma returns the smoothing factor for the serise.
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func (ema EMASeries) GetSigma() float64 {
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return 2.0 / (float64(ema.Period) + 1)
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return 2.0 / (float64(ema.GetPeriod()) + 1)
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}
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// GetValue gets a value at a given index.
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