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change ema21 direction as signal?

Indicators/Strategies/Analyzers

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M
marketmaker last edited by
hi guys,
I would like to have a buy signal when ema21 change it's direction (stop falling, starts rising). is there any quick way to do it or do I need to access previous day ema21 to compare values if there is a direction change?

I have this but it doesn't work as expected:
```
ema21 = bt.ind.EMA(period=21)
self.ema21up = bt.indicators.UpDay(ema21)
```
thank you...
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