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FIR Hann Window Indicator (Ehlers)

From Ehlers' Windowing article:

"A still-smoother weighting function that is easy to program is called the Hann window. The Hann window is often described as a “sine squared” distribution, although it is easier to program as a cosine subtracted from unity . The shape of the coefficient outline looks like a sinewave whose valleys are at the ends of the array and whose peak is at the center of the array. This configuration offers a smooth window transition from the smallest coefficient amplitude to the largest coefficient amplitude."

Ported from: { TASC SEP 2021 FIR Hann Window Indicator } (C) 2021 John F. Ehlers
Stocks & Commodities V. 39:09 (8–14, 23): Windowing by John F. Ehlers
Original code found here: https://traders.com/Documentation/FEEDbk...
FIR Chart: https://traders.com/Documentation/FEEDbk...
ROC Chart: https://traders.com/Documentation/FEEDbk...

Ehlers style implementation mostly maintained for easy verification.
Added optional ROC display.

Style and efficiency updates + Hann windowing as a function coming soon.

Indicator added twice to chart show both FIR and ROC .
开源脚本

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 a publication is governed by House Rules. You can favorite it to use it on a chart.

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