Lookback loop help please

This topic has 16 replies, 3 voices, and was last updated 3 years ago by robertogozzi.

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01/15/2021 at 4:03 PM #157950

robdav

I am trying to write an indicator which looks back 10 bars (for example) for the first condition.

e.g. variable A = 7

I then want it to look for a secondary condition from that bar onwards but within the original lookback period of 10 bars.

So, let’s say eight bars back A = 7 and five bars back A = 6, I want to be able to highlight both conditions with an arrow of a different colour, for testing purposes.

However, I’m struggling with the code and would be grateful if someone could point me in the right direction. I think I need a second FOR loop maybe?

This is what I have so far.

Lookback = 10

FOR i = 0 TO lookback DO
IF A[i] = 7 THEN
DRAWARROWDOWN(Barindex[i],High[i]) COLOURED(255,0,0)
IF i > 0 AND i < lookback AND A[i] =< 6 THEN
DRAWARROWDOWN(Barindex[i],High[i]) COLOURED(0,0,255)
ENDIF
ENDIF
NEXT

Lookback = 10

FOR i = 0 TO lookback DO

IF A[i] = 7 THEN

DRAWARROWDOWN(Barindex[i],High[i]) COLOURED(255,0,0)

IF i > 0 AND i < lookback AND A[i] =< 6 THEN

DRAWARROWDOWN(Barindex[i],High[i]) COLOURED(0,0,255)

ENDIF

Thanks

Rob

robdav

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01/15/2021 at 4:15 PM #157951

Vonasi

Perhaps something like this (not tested):

Lookback = 10

flag = 0
FOR i = 0 TO lookback DO
IF A[i] = 7 THEN
DRAWARROWDOWN(Barindex-i,High[i]) COLOURED(255,0,0)
flag = 1
for b = i to lookback
IF A[b] =< 6 THEN
DRAWARROWDOWN(Barindex-i+b,High[i+b]) COLOURED(0,0,255)
break
ENDIF
next
ENDIF
if flag then
break
endif
NEXT

Lookback = 10

flag = 0

FOR i = 0 TO lookback DO

IF A[i] = 7 THEN

DRAWARROWDOWN(Barindex-i,High[i]) COLOURED(255,0,0)

flag = 1

for b = i to lookback

IF A[b] =< 6 THEN

DRAWARROWDOWN(Barindex-i+b,High[i+b]) COLOURED(0,0,255)

break

ENDIF

if flag then

break

endif

robdav

Vonasi

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01/15/2021 at 6:38 PM #157972

robdav

Thanks Vonasi, I will play around with this and see if I can get there!

robdav

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01/15/2021 at 8:09 PM #157987

Vonasi

I edited line 10 in my post as it should have been High[i+b].

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robdav

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01/16/2021 at 11:50 AM #158048

robdav

I still can’t quite get there, but using flags to debug has helped.

It seems to be the second FOR loop I’m struggling with, it seems to kick in at the same time as the first FOR loop.

I have updated the code so this could be used with any indicator, I think. In this case I have used Momentum as an example only.

I don’t just want to see if Mom[5] < Mom[10] if you see what I mean, as I need to use variable lookback periods and possibly test more complicated conditions.

Here is where I am at the moment, and should allow for testing.

It seems Flagk activates as soon as Flagj does and I only want it to activate after the first condition has been met but in the same lookback period.

Thanks again, Rob.

A = Momentum[12]

Lookback = 10

Flagj = 0
Flagk = 0

FOR j = 0 TO lookback DO
IF A[j] >= 30 THEN
TestAj = A[j]
//DRAWARROWDOWN(Barindex-j,High[j]) COLOURED(255,0,0)
Flagj = 1
FOR k = j TO Lookback
IF (A[k]) > 2 AND (A[k] < 23) THEN
TestAk = A[k]
Flagk = 1
//DRAWARROWDOWN(Barindex-k,High[k]) COLOURED(0,0,255)
BREAK
ENDIF
NEXT
ENDIF
IF Flagj THEN
BREAK
ENDIF
NEXT

RETURN A as "A", TestAj as "Test A j", Flagj as "Flag j", TestAk as "Test A k", Flagk as "Flag k"

A = Momentum[12]

Lookback = 10

Flagj = 0

Flagk = 0

FOR j = 0 TO lookback DO

IF A[j] >= 30 THEN

TestAj = A[j]

//DRAWARROWDOWN(Barindex-j,High[j]) COLOURED(255,0,0)

Flagj = 1

FOR k = j TO Lookback

IF (A[k]) > 2 AND (A[k] < 23) THEN

TestAk = A[k]

Flagk = 1

//DRAWARROWDOWN(Barindex-k,High[k]) COLOURED(0,0,255)

BREAK

ENDIF

IF Flagj THEN

BREAK

ENDIF

RETURN A as "A", TestAj as "Test A j", Flagj as "Flag j", TestAk as "Test A k", Flagk as "Flag k"

robdav

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01/16/2021 at 12:31 PM #158055

Vonasi

Try something like this:

A = momentum[12]

Lookback = 10

Flagj = 0
Flagk = 0

FOR j = 0 TO lookback DO
IF A[j] >= 30 THEN
//DRAWARROWDOWN(Barindex-j,High[j]) COLOURED(255,0,0)
Flag = 1
break
ENDIF
NEXT

if flag = 1 then
FOR k = j+1 TO Lookback
IF (A[k]) > 2 AND (A[k] < 23) THEN
DRAWARROWDOWN(Barindex-k,High[k]) COLOURED(0,0,255)
BREAK
ENDIF
NEXT
endif

RETURN

A = momentum[12]

Lookback = 10

Flagj = 0

Flagk = 0

FOR j = 0 TO lookback DO

IF A[j] >= 30 THEN

//DRAWARROWDOWN(Barindex-j,High[j]) COLOURED(255,0,0)

Flag = 1

break

ENDIF

if flag = 1 then

FOR k = j+1 TO Lookback

IF (A[k]) > 2 AND (A[k] < 23) THEN

DRAWARROWDOWN(Barindex-k,High[k]) COLOURED(0,0,255)

BREAK

ENDIF

endif

RETURN

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robdav

Vonasi

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01/16/2021 at 2:15 PM #158065

robdav

Thanks Vonasi

Although it works in this situation, it’s not quite what I need yet but I will work on it.

Many thanks

Rob

robdav

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01/16/2021 at 3:03 PM #158071

robertogozzi

Try this (not tested):

Lookback = 10
Flag1 = 0
Flag2 = 0 
FOR i = 0 TO lookback DO
   IF A[i] = 7 Then
      Flag1 = i
      For j = i DOWNTO 0
         IF A[j] = 6 Then
            Flag2 = j
            Break
         Endif
      Next
      Break
   ENDIF
NEXT
If Flag1 AND Flag2 then
   DRAWARROWDOWN(Barindex[Flag1],High[Flag1]) COLOURED(255,0,0)
   DRAWARROWDOWN(Barindex[Flag2],High[Flag2]) COLOURED(0,0,255)
Endif

Lookback = 10

Flag1 = 0

Flag2 = 0

FOR i = 0 TO lookback DO

IF A[i] = 7 Then

Flag1 = i

For j = i DOWNTO 0

IF A[j] = 6 Then

Flag2 = j

Break

Endif

Break

ENDIF

If Flag1 AND Flag2 then

DRAWARROWDOWN(Barindex[Flag1],High[Flag1]) COLOURED(255,0,0)

DRAWARROWDOWN(Barindex[Flag2],High[Flag2]) COLOURED(0,0,255)

Endif

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ZeroCafeine,

robdav

robertogozzi

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01/16/2021 at 3:45 PM #158079

robdav

Thanks Roberto

That looks great!

Cheers

Rob

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robertogozzi

robdav

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01/29/2021 at 12:04 PM #159799

robdav

Hi Roberto

I’m trying to test the High of the candle after ‘IF A[j] = 6 Then’ but I can’t seem to reference the candle correctly.

‘j – 1’ marks the candle but I can’t test it that way. What am I doing wrong please?

A = momentum[12]

Lookback = 10

Flag1 = 0
Flag2 = 0

FOR i = 0 TO lookback DO
   IF A[i] = 7 Then
     Flag1 = i
     For j = i DOWNTO 0
        IF A[j] = 6 Then
           Flag2 = j
           Break
           IF High[j-1] > 8870 THEN
              DRAWARROWDOWN(Barindex,High) COLOURED(0,0,0)
           ENDIF
        Endif
     Next
     Break
   ENDIF
NEXT

If Flag1 AND Flag2 then
   DRAWARROWDOWN(Barindex[Flag1],High[Flag1]) COLOURED(255,0,0)
   DRAWARROWDOWN(Barindex[Flag2],High[Flag2]) COLOURED(0,0,255)
Endif

RETURN

A = momentum[12]

Lookback = 10

Flag1 = 0

Flag2 = 0

FOR i = 0 TO lookback DO

IF A[i] = 7 Then

Flag1 = i

For j = i DOWNTO 0

IF A[j] = 6 Then

Flag2 = j

Break

IF High[j-1] > 8870 THEN

DRAWARROWDOWN(Barindex,High) COLOURED(0,0,0)

ENDIF

Endif

Break

ENDIF

If Flag1 AND Flag2 then

DRAWARROWDOWN(Barindex[Flag1],High[Flag1]) COLOURED(255,0,0)

DRAWARROWDOWN(Barindex[Flag2],High[Flag2]) COLOURED(0,0,255)

Endif

RETURN

Many thanks

Rob

robdav

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01/29/2021 at 12:14 PM #159806

Vonasi

The BREAK needs to be below the test otherwise the test will never be carried out.

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robertogozzi

Vonasi

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01/29/2021 at 12:35 PM #159811

robdav

Yes, I tried that but it doesn’t like the test of

‘ High[j–1]’

It fails with “A positive integer field is expected with”, I think because it doesn’t like the minus – sign in the High test.

That’s why I think I need to reference the candle after the ‘IF A[j] = 6 Then’ test another way but can’t work out how to get the candle after it.

Thanks.

Rob

robdav

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01/29/2021 at 12:42 PM #159814

robertogozzi

Make sure line 15 doesn’t have a negative value:

IF High[max(0,j-1)] > 8870 THEN

1	IF High[max(0,j-1)] > 8870 THEN

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robdav

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01/29/2021 at 3:39 PM #159843

robdav

I need another test to make sure that between condition 1 “A[i] = 7″ and condition 2 “A[j] = 6″ that there hasn’t been close above (in this case) a close since condition 1 was met.

I think I need another FOR loop rather than and combined IF statement, correct?

I’ve tried this but it doesn’t work 🙁

A = momentum[12]
 
Lookback = 10
 
Flag1 = 0
Flag2 = 0
 
// 1st loop tests A = 7 and logs closing level
FOR i = 0 TO lookback DO
   IF A[i] = 7 Then
      Flag1 = i
      Closelevel = Close[i]

      // 2nd loop NEEDS to test that all closes between now and A equaling 6 are less than Closelevel variable

      FOR k = i DOWNTO j
         IF Close[k] < Closelevel THEN

            // 3rd loop to test A = 6
            For j = i DOWNTO 0

               IF A[j] = 6 Then
                  Flag2 = j
                  IF High[max(0,j-1)] > Closelevel THEN
                     Flag3 = max(0,j-1)
                     DRAWARROWDOWN(Barindex[Flag3],High[Flag3]) COLOURED(0,0,0)
                  ENDIF
                  Break
                  Endif

            Next
         ENDIF
      NEXT
      Break
   ENDIF
NEXT
 
If Flag1 AND Flag2 then
   DRAWARROWDOWN(Barindex[Flag1],High[Flag1]) COLOURED(255,0,0)
   DRAWARROWDOWN(Barindex[Flag2],High[Flag2]) COLOURED(0,0,255)
Endif
 
RETURN

A = momentum[12]

Lookback = 10

Flag1 = 0

Flag2 = 0

// 1st loop tests A = 7 and logs closing level

FOR i = 0 TO lookback DO

IF A[i] = 7 Then

Flag1 = i

Closelevel = Close[i]

// 2nd loop NEEDS to test that all closes between now and A equaling 6 are less than Closelevel variable

FOR k = i DOWNTO j

IF Close[k] < Closelevel THEN

// 3rd loop to test A = 6

For j = i DOWNTO 0

IF A[j] = 6 Then

Flag2 = j

IF High[max(0,j-1)] > Closelevel THEN

Flag3 = max(0,j-1)

DRAWARROWDOWN(Barindex[Flag3],High[Flag3]) COLOURED(0,0,0)

ENDIF

Break

Endif

ENDIF

Break

ENDIF

If Flag1 AND Flag2 then

DRAWARROWDOWN(Barindex[Flag1],High[Flag1]) COLOURED(255,0,0)

DRAWARROWDOWN(Barindex[Flag2],High[Flag2]) COLOURED(0,0,255)

Endif

RETURN

Thanks again, Rob

robdav

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01/29/2021 at 4:49 PM #159851

robertogozzi

At line 16 J has no value.

My first post was about a hypothetical use, without indicators.

You have added the MOMENTUM indicator, can you explain what exactly you want to detect.

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