34 lines
595 B
Go
34 lines
595 B
Go
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package indicator
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// SMMA Smoothed Moving Average (SMMA)
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type SMMA struct {
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MABase
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sma *SMA
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age int
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bFirst bool
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}
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func NewSMMA(winLen int) *SMMA {
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sm := new(SMMA)
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sm.winLen = winLen
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sm.sma = NewSMA(sm.winLen)
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sm.bFirst = true
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return sm
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}
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func (sm *SMMA) Update(price float64) {
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if sm.bFirst {
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nLen := sm.age + 1
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if nLen < sm.winLen {
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sm.sma.Update(price)
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} else if nLen == sm.winLen {
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sm.sma.Update(price)
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sm.result = sm.sma.Result()
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sm.bFirst = false
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}
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sm.age++
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} else {
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sm.result = (sm.result*float64(sm.winLen-1) + price) / float64(sm.winLen)
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}
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}
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