midtownsk8rguy

Truncated Bandpass Filter and Bandpass Filter - Dr. John Ehlers

With the arrival of the blessed gifts of arrays from TV, I now present the REAL "Truncated Bandpass Filter" indicator employing PSv4.0 upon initial release, originally formulated by the magnificent mathemagician Dr . John Ehlers for TASC - July 2020 Traders Tips. Don't be bamboozled by the other incorrect truncated bandpass filters found on TV, those published with an erroneous haste that preceded Pine array availability. More information about these bandpass filters can be acquired with a simple search for this indicator's white paper, entitled "TRUNCATED INDICATORS by John F. Ehlers", on his site in the educational reference section.

This actually contains two indicators, one being the truncated bandpass, the other being a two pole bandpass which is also found in my Voss implementation. The two pole bandpass is primarily for comparison of both types, but as you can see, they share common code within both, one being truncated and the other not. I modified Ehlers' original truncation formulation by allowing the capability to alter the truncation period using two distinct methods. I will explain very briefly that the purpose of a truncated "infinite impulse response" filter is to dampen it's response. Truncation techniques aren't limited to only bandpass filters, "some" other IIR filters, but not all, may benefit from this as well.

Lastly this is a miniature starter lesson by example of how the new native Pine array functions may be used, along with other various methods such as `var` to improve computational efficiency on the cloud servers. Yep, native Pine arrays just doubled the "Power of Pine" by exponential magnitudes of power into the dimension of what I would now term as the "Immense Power of Pine". The next generation capability of programming extremely advanced indicators has now successfully arrived on mothership Earth, right on TradingView's front lawn. Who would of known?? This is brought to you in part by the devoted voluntary efforts of the most skilled poetic programmers on TV, the likes of which most extraterrestrial alien programmers would fear. Ladies and Gents , YOU KNOW WHO YOU ARE. Wink, wink!

NOTICE: You have absolute freedom to use this source code any way you see fit within your new Pine projects. You don't have to ask for my permission to reuse these functions in your published scripts, simply because I have better things to do than answer requests for the reuse of the tbpf() and bpf() functions. Sufficient accreditation regarding this script and compliance with "TV's House Rules" regarding code reuse, is as easy as copying the functions in their entirety as is. Fair enough? Good!

Features List Includes:
Dark Background - Easily disabled in indicator Settings->Style for "Light" charts or with Pine commenting
AND a few more... Why list them, when you have the source code to explore!

When available time provides itself, I will consider your inquiries, thoughts, and concepts presented below in the comments section, should you have any questions or comments regarding this indicator. When my indicators achieve more prevalent use by TV members , I may implement more ideas when they present themselves as worthy additions. Have a profitable future everyone!
오픈 소스 스크립트

진정한 TradingView의 정신에 따라, 이 스크립트의 작성자는 스크립트를 오픈소스로 게시했기에 거래자들이 이해하고 확인할 수 있습니다. 작가님께 건배! 스크립트를 무료로 사용할 수 있지만, 게시물에서 이 코드를 재사용하는 것은 하우스룰을 따릅니다. 당신은 스크립트를 차트에 사용하기 위해 그것을 즐겨찾기 할 수 있습니다.

차트에 이 스크립트를 사용하시겠습니까?

코멘트

I also really like to double plot the (style=plot.style_area) with (style=plot.style_line)
It makes the area plot much more pronounced !!! and easier to read :)
Thank you for the publication
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Wow pure gold here. Amazing indicator.
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great indicator! thanks for sharing another Ehlers indicator:D
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Could someone explain the function of this indicator and how to utilize it ? And possibly how to use his VOSS predictor also, please.
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That's amazing! And it gives so few false signals. Thank you for sharing :)
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Is line 25 (array.fill()) not redundant? Or is it supposed to be zero-ing out the array elements on every bar/function-call?
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