Any questions from newcomers on MQL4 and MQL5, help and discussion on algorithms and codes - page 1148

[Roman Sharanov]

Why is it that the quotes are 5 digits, but the indicator gives out values of 4 digits? There is no rounding or anything

[Artyom Trishkin]

Roman Sharanov:
Why is it that the quotes are 5 digits, but the indicator gives out values of 4 digits? There is no rounding or anything

IndicatorSetInteger(INDICATOR_DIGITS,Digits());

[Roman Sharanov]

Artyom Trishkin:

thank you

[Alexandr Sokolov]

Why the function ...

PositionsTotal()

... ...sometimes returns 0 when there is actually one open position? MQL5

The logic of its operation depends on it

if(trade_p && PositionsTotal() == 0 && trade_o && OrdersTotal() > 0)
     {
      if(Order_Close()) ExpertRemove();
     }

... here is proof

[DariyaHr]

Good afternoon, could you please tell me how to disable auto-scrolling graphics on android? ( Meta Treder 4)

[Aliaksei Karalkou]

Hello.

I'm having a hard time. I can not set in the logic of the indicator Bolingeer Bunds rule to draw lines from the previous day's close.

The function iClose("USDCHF",PERIOD_D1,0) seems to be suitable, but not quite. When recalculating the cycle on the hourly chart everything breaks immediately.

//+------------------------------------------------------------------+
//|                                                       Клюква.mq4 |
//|                                              Алексей Корольков . |
//|                            https://www.mql5.com/ru/users/alekkar |
//+------------------------------------------------------------------+
#property copyright   "2020 Алексей Корольков ."
#property link        "https://www.mql5.com/ru/users/alekkar"
#property description "Клюква"
#property strict

#include <MovingAverages.mqh>

#property indicator_chart_window
#property indicator_buffers 3
#property indicator_color1 LightSeaGreen
#property indicator_color2 LightSeaGreen
#property indicator_color3 LightSeaGreen
//--- indicator parameters
input int    InpBandsPeriod=20;      // Bands Period
input int    InpBandsShift=0;        // Bands Shift
input double InpBandsDeviations=2.0; // Bands Deviations
input string SimbolUSD="USDIDX..";
//--- buffers
double ExtMovingBuffer[];
double ExtUpperBuffer[];
double ExtLowerBuffer[];
double ExtStdDevBuffer[];
double Drv,DrvIn,min,max,minIn,maxIn,xx,xIn,natr,natrIn,ma1,ma2,bid1,bid2,R1,R2,R01,R02;
int tm,mn;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit(void)
  {
//--- 1 additional buffer used for counting.
   IndicatorBuffers(4);
   IndicatorDigits(Digits);
//--- middle line
   SetIndexStyle(0,DRAW_LINE);
   SetIndexBuffer(0,ExtMovingBuffer);
   SetIndexShift(0,InpBandsShift);
   SetIndexLabel(0,"Bands SMA");
//--- upper band
   SetIndexStyle(1,DRAW_LINE);
   SetIndexBuffer(1,ExtUpperBuffer);
   SetIndexShift(1,InpBandsShift);
   SetIndexLabel(1,"Bands Upper");
//--- lower band
   SetIndexStyle(2,DRAW_LINE);
   SetIndexBuffer(2,ExtLowerBuffer);
   SetIndexShift(2,InpBandsShift);
   SetIndexLabel(2,"Bands Lower");
//--- work buffer
   SetIndexBuffer(3,ExtStdDevBuffer);
//--- check for input parameter
   if(InpBandsPeriod<=0)
     {
      Print("Wrong input parameter Bands Period=",InpBandsPeriod);
      return(INIT_FAILED);
     }
//---
   SetIndexDrawBegin(0,InpBandsPeriod+InpBandsShift);
   SetIndexDrawBegin(1,InpBandsPeriod+InpBandsShift);
   SetIndexDrawBegin(2,InpBandsPeriod+InpBandsShift);
//--- initialization done
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| Bollinger Bands                                                  |
//+------------------------------------------------------------------+
int OnCalculate(const int rates_total,
                const int prev_calculated,
                const datetime &time[],
                const double &open[],
                const double &high[],
                const double &low[],
                const double &close[],
                const long &tick_volume[],
                const long &volume[],
                const int &spread[])
  {
   int i,pos;
//---
   if(rates_total<=InpBandsPeriod || InpBandsPeriod<=0)
      return(0);
//--- counting from 0 to rates_total
   ArraySetAsSeries(ExtMovingBuffer,false);
   ArraySetAsSeries(ExtUpperBuffer,false);
   ArraySetAsSeries(ExtLowerBuffer,false);
   ArraySetAsSeries(ExtStdDevBuffer,false);
   ArraySetAsSeries(close,false);
//--- initial zero
   if(prev_calculated<1)
     {
      for(i=0; i<InpBandsPeriod; i++)
        {
         ExtMovingBuffer[i]=EMPTY_VALUE;
         ExtUpperBuffer[i]=EMPTY_VALUE;
         ExtLowerBuffer[i]=EMPTY_VALUE;
         
        }
     }
//--- определение АТР  
for(i=InpBandsPeriod-1; i>=0; i--)
        {
         xx=High[i]-Low[i];
         Drv+=xx;
         if(min>xx) min=xx;
         if(max<xx) max=xx;
         xIn=iHigh(SimbolUSD,NULL,i)-iLow(SimbolUSD,NULL,i);
         DrvIn+=xIn;
         if(minIn>xIn) minIn=xIn;
         if(maxIn<xIn) maxIn=xIn; 
        }   
 Drv/=InpBandsPeriod;
 DrvIn/=InpBandsPeriod;
 natr=((Drv-min)/(max-min))*100; //тут определяем пройденное значение атр инструментом на графике
 natrIn=((DrvIn-minIn)/(maxIn-minIn))*100; //тут определяем пройденное значение атр инструментом на индексе доллара
 //средние АТР
 ma1=iMA(NULL,0,InpBandsPeriod,0,2,1,0);
 ma2=iMA(SimbolUSD,0,InpBandsPeriod,0,2,1,0); 
 //определяем знак АТР
 bid1=MarketInfo(NULL,MODE_BID);
 bid2=MarketInfo(SimbolUSD,MODE_BID);
 if (bid1-ma1<0) Drv=Drv*(-1); // если цена падает значит минус
 if (bid2-ma2<0) DrvIn=DrvIn*(-1); // если цена падает значит минус
 
 // а теперь сама она родная 
 //где Drv инструмент графика,а DrvIn индекс доллара
 //расчёт индекса волатильности для инструмента
 R01 = (1-(1+Drv)/(1+max))*100;//используем для движения вверх
 R02 = (1-(1-Drv)/(1+max))*100;//используем для движения вниз
 //расчёт индекса волатильности для доллара
 R1 = (1-(1+DrvIn)/(1+maxIn))*100;// 
 R2 = (1-(1-DrvIn)/(1+maxIn))*100;//используем для движения вниз 
 // далее сам расчёт
 
 
         
     
//--- начальный расчет
   if(prev_calculated>1)
      pos=prev_calculated-1;
   else
      pos=0;
//--- главный цикл
   for(i=pos; i<rates_total && !IsStopped(); i++)
     { 
      //--- средняя линия
      ExtMovingBuffer[i]=SimpleMA(i,InpBandsPeriod,close);
      //--- рассчитайте и запишите со стандартным отклонением
      ExtStdDevBuffer[i]=StdDev_Func(i,close,ExtMovingBuffer,InpBandsPeriod); // тут наверно смогу разместить код 
      //--- верхняя линия указывает зону перекупленности
     // -- тут хотел параметр ExtMovingBuffer[i] заменить на  iClose("USDCHF",PERIOD_D1,0)
      ExtUpperBuffer[i]=ExtMovingBuffer[i]+(max)*(R01+R2)/2; //Print("Drv ",Drv,",DrvIn",DrvIn,", R1", R1,", R2 ", R2);
      //--- нижняя линия указывает зону перепроданности
      ExtLowerBuffer[i]=ExtMovingBuffer[i]+(-max)*(R02+R1)/2; 
      //---
     }
//---- OnCalculate done. Return new prev_calculated.
   return(rates_total);
  }
//+------------------------------------------------------------------+
//| Calculate Standard Deviation                                     |
//+------------------------------------------------------------------+
double StdDev_Func(int position,const double &price[],const double &MAprice[],int period)
  {
//--- variables
   double StdDev_dTmp=0.0;
//--- check for position
   if(position>=period)
     {
      //--- calcualte StdDev
      for(int i=0; i<period; i++)
         StdDev_dTmp+=MathPow(price[position-i]-MAprice[position],2);
      StdDev_dTmp=MathSqrt(StdDev_dTmp/period);
     }
//--- return calculated value
   return(StdDev_dTmp);
  }
//+------------------------------------------------------------------+

Thanks for the help

[Yurij Kozhevnikov]

Good afternoon.

There's a question about binary files: is there any way to trim their tails?

[[Deleted]]

Yurij Kozhevnikov:

Good afternoon.

Here's a question about binary files: is there any way to trim their tails?

filename = "эта@с_хвостом.bin";

filename = "a_et@tailless";

)))

Or which tail did you mean?

[Yurij Kozhevnikov]

Сергей Таболин:

filename = "эта@с_хвостом.bin";

filename = "a_ta@no_tail";

)))

Or which tail were you referring to?

You can move the pointer around the binary files, read and write from any place. Is there any way to delete, clear, from the current point to the end of the file? Is it possible to write a sign of the end of the file? Can it be reduced? Without overwriting.

[Igor Makanu]

Yurij Kozhevnikov:

Good afternoon.

There is such a question on binary files: is it possible somehow to trim their tail?

you can't

Look for a topic in section 4. There was such a question about a week ago and someone suggested a solution with WinAPI call (.dll)