How to define only the first correction after the start of a new trend

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03/21/2021 at 12:03 PM #164796 quote

tijuanataxi
Participant

New

How to define the exclusive output of the first correction after the start of a new trend?

Dear all!
Unfortunately I am still quite inexperienced and I have no idea how to solve this. I am asking for the output of the first correction after the start of a new trend in the screener.
Trend is defined as EMA 100 > EMA 200, as well as momentum higher timeframe. (that is clear)
Correction is to be defined by a negative histogram for uptrends or vice versa.

I want to avoid the output of further corrections in the trend, only the first correction should be relevant. I hope someone can possibly solve this. Many thanks in advance.

query-prorealcode.jpg

03/21/2021 at 12:48 PM #164799 quote
robertogozzi
Moderator

Master
I tested it and it seems to work as expected:
```
IF BarIndex <= 1 THEN
   CrossOver = 0
   Flag      = 0
ENDIF
Ema100 = average[100,1](close)
Ema200 = average[200,1](close)
MyMACD = MACD[12,26,9](close)
IF Ema100 CROSSES OVER Ema200 THEN
   CrossOver = 1
   Flag      = 0
ELSIF Ema100 CROSSES UNDER Ema200 THEN
   CrossOver = 0
   Flag      = 0
ENDIF
MacdCross = MyMacd CROSSES UNDER 0
IF Flag THEN
   MacdCross = 0
ELSIF CrossOver AND MacdCross THEN
   Flag = 1
ENDIF
SCREENER[MacdCross]
```
tijuanataxi thanked this post
03/21/2021 at 1:30 PM #164802 quote
tijuanataxi
Participant

New
wow, that was really fast, thanks a lot! But as far as I can see I’m not getting the results I want, I only changed the code slightly because I am using a very slow macd (30/60/25). e.g. usdhuf, tf 1 hour, is returned as hit, but there is already the 4th correction (macd negative). But anyway I got an idea how I can fix this. Thanks a lot

I used
```
IF BarIndex <= 1 THEN
CrossOver = 0
Flag      = 0
ENDIF
Ema100 = average[100,1](close[1])
Ema200 = average[200,1](close[1])
MyMACD = MACD[30,60,25](close[1])
IF Ema100 CROSSES OVER Ema200 THEN
CrossOver = 1
Flag      = 0
ELSIF Ema100 CROSSES UNDER Ema200 THEN
CrossOver = 0
Flag      = 0
ENDIF
MacdCross = MyMacd CROSSES UNDER 0
IF Flag THEN
MacdCross = 0
ELSIF CrossOver AND MacdCross THEN
Flag = 1
ENDIF
SCREENER[MacdCross]
```
macd-pro-real-code.jpg
03/21/2021 at 4:16 PM #164811 quote

tijuanataxi
Participant

New

I think i have to add a count so that the flags / histogram are counted while the trend is still present and an output only occurs when count = 1.

09/20/2021 at 1:42 PM #177977 quote

tijuanataxi
Participant

New

Hi guys, I haven’t dealt with this question for a while and would now like to try to get an answer. The above code does not give the desired results in the screener. The question would be the first correction defined as a MACD cross after the start of a trend, e.g. by an EMA cross. Unfortunately, my knowledge is not sufficient for this. Maybe someone has an idea.

trend-example.jpg

09/20/2021 at 3:04 PM #177979 quote
Swingueur
Participant

Average
Hello,
Indeed you may need a count. Though the code of @robertogozzi looks good, I would try something like this (not tested):
```
IF BarIndex <= 1 THEN
   CrossOver = 0
   Flag      = 0
ENDIF
Ema100 = average[100,1](close)
Ema200 = average[200,1](close)
MyMACD = MACD[12,26,9](close)
IF Ema100 CROSSES OVER Ema200 THEN
   CrossOver = 1
   Flag      = 0
ELSIF Ema100 CROSSES UNDER Ema200 THEN
   CrossOver = 0
   Flag      = 0
ENDIF
MacdCross = MyMacd CROSSES UNDER 0
IF CrossOver AND MacdCross THEN
   Flag = Flag+1
ENDIF
SCREENER[Flag=1]
```
09/20/2021 at 3:17 PM #177980 quote

tijuanataxi
Participant

New

Line 5 to line 17 makes perfect sense to me, but I don’t understand counting events logically.
The suggested code unfortunately does not work and gives no results. It seems that the counting does not work.
Thanks nevertheless!

09/21/2021 at 6:09 AM #178008 quote
Swingueur
Participant

Average
Hello,
To better know how the code works, you may start to develop an indicator to put on price that will show your signals. Then you will be able to screen more confidently I believe.
```
IF BarIndex <= 1 THEN
   CrossOver = 0
   Flag      = 0
ENDIF
Ema100 = average[100,1](close)
Ema200 = average[200,1](close)
MyMACD = MACD[12,26,9](close)
IF Ema100 CROSSES OVER Ema200 THEN
   CrossOver = 1
   Flag      = 0
ELSIF Ema100 CROSSES UNDER Ema200 THEN
   CrossOver = 0
   Flag      = 0
ENDIF
MacdCross = MyMacd CROSSES UNDER 0
IF CrossOver AND MacdCross THEN
   Flag = Flag+1
   DRAWARROWUP(barindex,low-1*AverageTrueRange[14])coloured(204,0,0)
   DRAWTEXT("N#Flag#",barindex,low-1.5*AverageTrueRange[14],SansSerif,Bold,11)coloured(0,0,0)
ENDIF
RETURN
```
PS: The screener may be SCREENER[CrossOver and MacdCross and Flag=1]
09/21/2021 at 7:09 AM #178012 quote

robertogozzi
Moderator

Master

My code is working as expected, with any MACD setting you choose, as from my pic.

Try increasing the units on your chart, an Ema200 will require many more bars than its periods to be correctly calculated. Use at least 1K bars.

x-13.jpg

09/21/2021 at 8:15 AM #178026 quote

tijuanataxi
Participant

New

I’m sorry, but I don’t think that’s the case.
Attached is the screener, as well as the results in 4 hours.
As an example USDCAD – it gives me every single correction, but only the very first is asked for.

chart-result.jpg screener-result.jpg

09/21/2021 at 8:20 AM #178032 quote

robertogozzi
Moderator

Master

Yes, you asked for the very first one in your first post “I am asking for the output of the first correction after the start of a new trend in the screener“.

09/21/2021 at 8:33 AM #178037 quote

tijuanataxi
Participant

New

Yes, indeed, and can write a code for a screener that gives me any correction, but I am not able to filter only the first correction after the start of a new trend – that is what I want to learn

09/21/2021 at 8:59 AM #178047 quote
robertogozzi
Moderator

Master
This one will allow you to detect a) the first correction only or b) all corrections:
```
IF BarIndex <= 1 THEN
   CrossOver = 0
   Flag      = 0
   FirstOnly = 1     //1=detect ONLY the first correction,  0=detect ALL corrections
ENDIF
Ema100 = average[100,1](close)
Ema200 = average[200,1](close)
MyMACD = MACD[30,60,25](close)
IF Ema100 CROSSES OVER Ema200 THEN
   CrossOver = 1
   Flag      = 0
ELSIF Ema100 CROSSES UNDER Ema200 THEN
   CrossOver = 0
   Flag      = 0
ENDIF
MacdCross = MyMacd CROSSES UNDER 0
IF Flag THEN
   MacdCross = 0
ELSIF CrossOver AND MacdCross THEN
   IF FirstOnly THEN
      Flag = 1
   ENDIF
ENDIF
SCREENER[MacdCross]
```
simply change 1 to 0 in line 4 to detect ALL corrections.
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