Is it possible to scale in and scale out of trades

• 10/07/2025 at 7:54 AM #252227
  Mellstock

  I want to write a program where I build up a number of short positions say 5. (Sellshort)

  When CountOfPosition = say 5 start buying them back.
  Boolean variable BuybackMode = False during build up of short position
  BuybackMode = True once CountOfPosition = 5 and stays True whilst positions bought back.

  The issue I am having is that I can build up the sellshort positions according to criteria 1 through 5 ok.

  The issue I am having although I specify Buy 1 Contract back at a time the first time the first buy criteria is met the whole
  position, all 5 contracts are bought back.

  So trades entered using Sellshort singlely 1 through 5
  Plan to exit them singlely using Buy.

  My question is of concept in the first instance.

  “Is it possible to scale in and scale out of trades in PRT?”

  

  Mellstock

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  10/07/2025 at 8:16 AM #252231
  PeterSt

  Sure, but in your example you must ExitShort (or Sell when your position is Long).
  This works only with Market Orders. But beware, Backtesting allows it with Pending Orders as well – hence don’t use them accidentally.

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  Iván

  

  PeterSt

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  10/07/2025 at 11:58 AM #252240
  robertogozzi

  Try this one (not tested):

  ONCE MaxPositions = 5 IF Not OnMarket THEN BuyBack = 0 ENDIF IF MyShortConditions AND abs(CountOfPosition) < MaxPositions AND Not BuyBack THEN SELLSHORT 1 Contract at Market ENDIF IF MyBuyBackConditions AND ShortOnMarket THEN EXITSHORT at Market BuyBack = 1 ENDIF

  1 2 3 4 5 6 7 8 9 10 11

  ONCE MaxPositions = 5 IF Not OnMarket THEN    BuyBack = 0 ENDIF IF MyShortConditions AND abs(CountOfPosition) < MaxPositions AND Not BuyBack THEN    SELLSHORT 1 Contract at Market ENDIF IF MyBuyBackConditions AND ShortOnMarket THEN    EXITSHORT at Market    BuyBack = 1 ENDIF

   

   

  

  robertogozzi

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  10/08/2025 at 9:49 AM #252328
  robertogozzi

  I realized that the above snippet closes ALL the positions, you might prefer this line 9:

  EXITSHORT 1 Contract at Market

  1	EXITSHORT 1 Contract at Market

   

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  Mellstock

  

  robertogozzi

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  10/08/2025 at 11:25 AM #252337
  Mellstock

  Thank you.

  I have my code working now in Demo.

  I worked out, having been given the heads up about ExitShort, the correct syntax.

  Thanks again

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  robertogozzi

  

  Mellstock

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