# Falling-Rising Filter

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Introduction

This is a modification of an old indicator i made. This filter aim to adapt to market trend by creating a smoothing constant using highest and lowest functions. This filter is visually similar to the edge-preserving filter, this similarity can make this filter quite good for MA cross strategies.

On The Filter Code

a = nz (a) + alpha*nz(error) + beta*nz(error)

The first 3 terms describe a simple exponential filter where error = price - a, beta introduce the adaptive part. beta is equal to 1 when the price is greater or lower than any past price over length period, else beta is equal to alpha, someone could ask why we use two smoothing variable (alpha, beta) instead of only beta thus having :

a = nz (a) + beta*nz(error)

well alpha make the filter converge faster to the price thus having a better estimation.

In blue the filter using only beta and in red the filter using alpha and beta with both length = 200, the red filter converge faster to the price, if you need smoother results but less precise estimation only use beta.

Conclusion

I have presented a simple indicator using rising/falling functions to calculate an adaptive filter, this also show that when you create an exponential filter you can use more terms instead of only a = a + alpha*(price - a). I hope you find this indicator useful.

Release Notes: Fixed a redundant error, thanks to @aaahopper for pointing it out.
Skript med en öppen källkod

I sann TradingView-anda har författaren till detta skript publicerat det som öppen källkod, så att handlare kan förstå och verifiera det. Skål för författaren! Du kan använda den gratis men återanvändning av den här koden i en publikation regleras av våra Ordningsregler. Du kan göra den till favorit för att använda den i ett diagram.

Vill du använda det här skriptet i ett diagram?
Patreon: https://www.patreon.com/alexgrover

You can also check out some of the indicators I made for luxalgo : https://www.tradingview.com/u/LuxAlgo/#published-scripts

## Kommentarer

excellent work thanks
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kumarasami
@kumarasami, Thanks for your comment :)
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it was perfect ! thanks
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elvisforex
@elvisforex, Thanks for the support :)
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Hi @alexgrover
How would you change the script to have an opposite line?
I noticed by having a large length you can create lines similar to a band on which you can pick tops and bottoms for quick trades.
Could you assist?
Thanks
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aaahopper
@aaahopper, Hi aahopper, thanks for commenting, the closest script i have for what you are asking is the flagging band indicator. But i can try to tweak the code for what you want.
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alexgrover
Hi @alexgrover,

I found this line a lot smoother and direction of trend :).
I can't thank you enough for such great work.
You are amazing:)
(Note: Could you check my separate comment below)
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aaahopper
@aaahopper, You are very welcome, and thank you so much for pointing the line 7 redundancy problem, i will upgrade the code right now, i'm feeling really bad recently and my condition have some repercussion on my codes.
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Hi @alexgrover
Thank you again for a great indicator. Just Brilliant :).
Question:
Why is "close" in line 7, not the src?
Thanks
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Very neat! Thanks, friend!
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