This is a Swing Filter, the function is to remind you that you do not need to trade during the neutral period, only buy or long when the series is higher than the high-level you set, when the series is lower than the low-level you set, you need to short or hedge. Hope your to use it happily. In a larger time frame, the length can be set smaller, the default value is 100.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in publication is governed by House rules. You can favorite it to use it on a chart.
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