NormalizeDouble in MT5 strategy tester

[Timothy Smith]

Hi MQL community,

I'm trying to normalize the bollinger band values into 5 digits from 6.

I tested using an alert and the value had been normalized correctly. However, when I run my EA in the strategy tester, it still shows 6 digits.

P.S. I have included a MQL4 to MQL5 converting file in the header.

Here is the test I ran:

Is this a known bug in the MT5 strategy tester?

Thanks, Tim

#property copyright "Copyright 2018, Tim Smith"
#property link      "https://www.mql5.com"
#property version   "1.00"

//#include <MT4orders.mqh>
#include <mql4compat.mqh>
//#include<mql4compat.mqh>
//#include <MT4Orders.mqh>
//+------------------------------------------------------------------+
//| Script program start function                                    |
//+------------------------------------------------------------------+
void OnStart()
  {
  
double LowerBB= NormalizeDouble(iBandsMQL4(NULL,0,20,2,0,6,MODE_LOWER,0),5);
Alert(LowerBB);
  
  }
//+------------------------------------------------------------------+

[Sergey Golubev]

I found few threads about NormalizeDouble - 

--------------------

Error in normalizing prices  

MY EA DOES NOT EXECUTE PARABOLIC STOP AND REVERSE (PSAR) CODE ON FOREXTIME, BUT IT DOES ON INSTATRADER

[kypa]

https://www.mql5.com/en/docs/convert/doubletostring

[William Roeder]

timothysmith78: I'm trying to normalize the bollinger band values into 5 digits from 6. it still shows 6 digits.

1. Floating point has infinite number of decimals, it's your not understanding floating point and that some numbers can't be represented exactly. (like 1/10.)
             Double-precision floating-point format - Wikipedia, the free encyclopedia

   See also The == operand. - MQL4 and MetaTrader 4 - MQL4 programming forum

   Print out your values to the precision you want with DoubleToString - Conversion Functions - MQL4 Reference.

2. Do NOT use NormalizeDouble, EVER. For ANY Reason. It's a kludge, don't use it. It's use is usually wrong, as it is in this case.
   • Print out your values to the precision you want with DoubleToString - Conversion Functions - MQL4 Reference.
   • SL/TP (stops) need to be normalized to tick size (not Point.) (On 5Digit Broker Stops are only allowed to be placed on full pip values. How to find out in mql? - MQL4 and MetaTrader 4 - MQL4 programming forum) and abide by the limits Requirements and Limitations in Making Trades - Appendixes - MQL4 Tutorial and that requires understanding floating point equality Can price != price ? - MQL4 and MetaTrader 4 - MQL4 programming forum
   • Open price for pending orders need to be adjusted. On Currencies, Point == TickSize, so you will get the same answer, but it won't work on Metals. So do it right: Trailing Bar Entry EA - MQL4 and MetaTrader 4 - MQL4 programming forum or Bid/Ask: (No Need) to use NormalizeDouble in OrderSend - MQL4 and MetaTrader 4 - MQL4 programming forum
   • Lot size must also be adjusted to a multiple of LotStep and check against min and max. If that is not a power of 1/10 then NormalizeDouble is wrong. Do it right.