Questions from Beginners MQL5 MT5 MetaTrader 5 - page 709

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Vladimir Karputov:

ArrayMinimum returns the INDEX of the element whose value is the lowest. Now we need to get the value itself from theLow array by the indexlow:

Low[low]

Nothing...

//+------------------------------------------------------------------+
//| Получим Low для заданного номера бара                            |
//+------------------------------------------------------------------+
double iLow(string symbol,ENUM_TIMEFRAMES timeframe,int do)
  {
   int low=0; double l=0;
   ArraySetAsSeries(Low,true);
   int copied=CopyLow(symbol,timeframe,0,do,Low);
   if(copied>0 && index<copied){ low=ArrayMinimum(Low);//ArrayMinimum(
   l = Low[low];
   }
   return(l);
  }
 
Top2n:

Nothing...

//+------------------------------------------------------------------+
//| Получим Low для заданного номера бара                            |
//+------------------------------------------------------------------+
double iLow(string symbol,ENUM_TIMEFRAMES timeframe,int index)
  {
   int low=0; double l=0;
   ArraySetAsSeries(Low,true);
   int copied=CopyLow(symbol,timeframe,0,index,Low);
   if(copied>0 && index<copied){ low=ArrayMinimum(Low);//ArrayMinimum(
   l = Low[low];
   }
   return(l);
  }


And who in your code isLow?
 
Vladimir Karputov:
What isLow in your code?
Low - Array contains Low prices from 0 toindex
 
Top2n:
Low - Array contains Low prices from 0 to do

Where do you see it? Put an array inside your function. Initialise variablel with "-1". In general, please use the Stylizer - your code is hard to read. Also you return something anyway, even if there was an error. That's not good.

Added: and why are you comparing like that:

if(copied>0 && index<copied)

You will never get a result that way.

//+------------------------------------------------------------------+
//| Получим Lowest для заданного промежутка                          |
//+------------------------------------------------------------------+
double iLowest(string symbol,ENUM_TIMEFRAMES timeframe,int bands)
  {
   double Low[];
   double result=-1;
   ArraySetAsSeries(Low,true);
   int copied=CopyLow(symbol,timeframe,0,bands,Low);
   if(copied==bands)
     {
      result=Low[ArrayMinimum(Low)];
     }
   return(result);
  }
 

Vladimir I think it's more universal

//+------------------------------------------------------------------+
//| Получим Lowest для заданного промежутка                          |
//+------------------------------------------------------------------+
double iLowest(
               string           symbol,          // символ
               int              timeframe,       // период
               int              count,           // число элементов
               int              start            // индекс
               )
  {
   double Low[];
   double result=-1;
   ArraySetAsSeries(Low,true);
   int copied=CopyLow(symbol,timeframe,start,count,Low);
   if(copied==start)
     {
      result=Low[ArrayMinimum(Low)];
     }
   return(result);
  }
 
but it's the full analogue of the function from the four
//+------------------------------------------------------------------+
//| Получим Lowest для заданного промежутка                          |
//+------------------------------------------------------------------+
double iLowest(
               string           symbol,          // символ
               int              timeframe,       // период
               int              type,            // идентификатор таймсерии
               int              count,           // число элементов
               int              start            // индекс
               )
  {
   double Low[];
   int copied=0.0;
   double result=-1;
   ArraySetAsSeries(Low,true);
   if(type==PRICE_CLOSE)copied=CopyClose(symbol,timeframe,start,count,Low);
   if(type==PRICE_OPEN)copied=CopyOpen(symbol,timeframe,start,count,Low);
   if(type==PRICE_HIGH)copied=CopyHigh(symbol,timeframe,start,count,Low);
   if(type==PRICE_LOW)copied=CopyLow(symbol,timeframe,start,count,Low);
   if(copied==start)
     {
      result=Low[ArrayMinimum(Low)];
     }
   return(result);
  }
//+------------------------------------------------------------------+
...
 
Vladimir Karputov:

Where do you see it? Put an array inside your function. Initialise variablel with "-1". In general, please use the Stylizer - your code is hard to read. Also you return something anyway, even if there was an error. This is not good.

Thank you!!!

 
I can't figure out how to add a standard trailing stop class to an EA, show me an example if you don't mind.
 
Kirill Andreev:
I can't figure out how to add a standard trailing stop class to an EA, show me an example if you don't mind.
Example: \MQL5\Experts\Examples\MACD\MACD Sample.mq5
 
Vladimir Karputov:
Example: \MQL5\Experts\Examples\MACD\MACD Sample.mq5
it doesn't work, that's too bad
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