[blackcat] L2 Ehlers Decycler

Level: 2


John F. Ehlers introuced Decycler in his "Cycle Analytics for Traders" chapter 4 on 2004.


The concept of a decycler is really pretty simple. The cyclic components are removed by the process of cancellation. If the high-pass filter output is subtracted from the input data, the residual only contains the low-frequency components. The decycler is a one-pole filter because the denominator contains only a first-order polynomial. By examination, the decycler must closely follow the input data because there is no difference term in the numerator of the transfer response.

Key Signal

Decycler ---> Decycler Indicator fast line
Trigger ---> Decycler Indicator slow line

Pros and Cons

100% John F. Ehlers definition translation of original work, even variable names are the same. This help readers who would like to use pine to read his book. If you had read his works, then you will be quite familiar with my code style.


The 36th script for Blackcat1402 John F. Ehlers Week publication.


In real life, I am a prolific inventor. I have successfully applied for more than 60 international and regional patents in the past 12 years. But in the past two years or so, I have tried to transfer my creativity to the development of trading strategies. Tradingview is the ideal platform for me. I am selecting and contributing some of the hundreds of scripts to publish in Tradingview community. Welcome everyone to interact with me to discuss these interesting pine scripts.

The scripts posted are categorized into 5 levels according to my efforts or manhours put into these works.

Level 1 : interesting script snippets or distinctive improvement from classic indicators or strategy. Level 1 scripts can usually appear in more complex indicators as a function module or element.

Level 2 : composite indicator/strategy. By selecting or combining several independent or dependent functions or sub indicators in proper way, the composite script exhibits a resonance phenomenon which can filter out noise or fake trading signal to enhance trading confidence level.

Level 3 : comprehensive indicator/strategy. They are simple trading systems based on my strategies. They are commonly containing several or all of entry signal, close signal, stop loss, take profit, re-entry, risk management, and position sizing techniques. Even some interesting fundamental and mass psychological aspects are incorporated.

Level 4 : script snippets or functions that do not disclose source code. Interesting element that can reveal market laws and work as raw material for indicators and strategies. If you find Level 1~2 scripts are helpful, Level 4 is a private version that took me far more efforts to develop.

Level 5 : indicator/strategy that do not disclose source code. private version of Level 3 script with my accumulated script processing skills or a large number of custom functions. I had a private function library built in past two years. Level 5 scripts use many of them to achieve private trading strategy.
Phát hành các Ghi chú: Based on @sgrabowski15 recommendations, I change another way to display buy and sell labels.
Gỡ bỏ khỏi Script Ưa thích Thêm vào Script Ưa thích
"Win$ & Donate w/ This" Address:

BTC / USDT(OMNI): 3DsouvyXoT4T2u8qdWvs9TXVD4hUozAKTc

ETH / ERC20 Coin: 0xfE2240fb97F11d81A324C6d3881de43E09EadEF9

LTC: LchnDmA2rnZ5ULdqbr9UbnTX4fFcP2yrJf

TRX: TEeUzBUvfYbqb8LyL7iGZbJewr9tWnxEuF

EOS: blackcatjust

Bình luận

I have been using this script for 3 weeks and it's amazing! I really appreciate your works and i feel very lucky to find your works, please keep going :) I have been using this script with RSI, CCI and Money Flow to find out overbougt or oversold areas for short and long positions. Well, it works almost perfect for 1 HR and 4 HR. Thank you in advance.
+1 Phản hồi
@tra4suc, glad to hear that, also i like this one very much as well. Dr. Ehlers have large numbers of inidcators, but which one could be helpful that really need your own efforts to find out. thanks for your feedback, i will try on 4H as well, and typically i use it on 30mins :D
Phản hồi
tra4suc blackcat1402
@blackcat1402, i have been trying it for 15 mins, 1 HR and 4 HR. The best results is 4HR so far. But after your reply, i will try it for 30 mins too :)
+1 Phản hồi
Another great script sir! Keep up the amazing work; I'm a big fan! :) I have spotted a small issue with this script relating to the BUY/SELL signals. I haven't had time to check your other recent scripts - with Buy/Sell signals - to see if this is an isolated problem with this script or not. Just as an example of the problem, If you look at a BTC/USD chart on the 1D TF between the 12th and 24th April 2020, you will notice that no BUY signal appears where it should. I have noticed this on other rare occasions too, but most of the time there is no issue, and a majority of the Buy/Sell signals work flawlessly. Very strange. Hope this helps :)
+1 Phản hồi
sgrabowski15 sgrabowski15
Edit: I think the problem occurs whenever the Fast and Slow lines cross twice within two/three bars. I can't see it happen in any other situation as far as I can see. Hope this helps :)
+1 Phản hồi
blackcat1402 sgrabowski15
@sgrabowski15, thanks for your reminding on this! I think this may happen with current label generation, i will try other label generatio scheme according for main chart.
Phản hồi
sgrabowski15 blackcat1402
@blackcat1402, A pleasure and thanks for the shout out :)
+1 Phản hồi
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