MQL5 : How to get the highest value of an indicator at specific time

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Hello everyone

Now i am making an indicator with MQL5

I tried to get the highest value of RSI in the last 100 candle like what happen in this article


William Roeder  2010.09.30 01:14        EN 
for(int i = limit-1; i>=0; i--) // Count down for one pass 
     RSI_Buffer[i]=iRSI(NULL,0,periodoRSI,PRICE_CLOSE,i);
     a1_Buffer[i] = ArrayMaximum(RSI_Buffer, 20, i);

 

but it was with MQL4

I did this with MQL5 but it dose not work!


any ideas please?

 
Ahmed Abd El Aziz: but it was with MQL4. I did this with MQL5 but it dose not work!

In MQL5, the function iRSI() returns a handle (not a value), and then you need to use CopyBuffer() to get the values. Please read the documentation for further details.

 
Ahmed Abd El Aziz:


An example of get values from the iRSI indicator

How to start with MQL5
How to start with MQL5
  • 2020.07.05
  • www.mql5.com
This thread discusses MQL5 code examples. There will be examples of how to get data from indicators, how to program advisors...
 
Thanks MR Fernando Carreiro
You are the best because you helping people


BUT I HAVE NO IDEA ABOUT HOW  TO USE CopyBuffer() 


As you see in the picture i want to determine the Resistance of RSI between (candle 0 and candle 20) , if it >  Resistance of RSI between (candle 20 and candle 28) i want to open sell


I will gives you an indicator below and you will correct this for me :)


 

Files:
FER.png  16 kb
 
Fernando Carreiro #:

In MQL5, the function iRSI() returns a handle (not a value), and then you need to use CopyBuffer() to get the values. Please read the documentation for further details.

//+------------------------------------------------------------------+
//|                                 Indicator: Fernando Carreiro.mq5 |
//|                                                                  |
//|                                                                  |
//+------------------------------------------------------------------+
#property version   "1.00"
#property description ""

//--- indicator settings
#property indicator_chart_window
#property indicator_buffers 2
#property indicator_plots 2

#property indicator_type1 DRAW_ARROW
#property indicator_width1 3
#property indicator_color1 0xFFAA00
#property indicator_label1 "Buy"

#property indicator_type2 DRAW_ARROW
#property indicator_width2 3
#property indicator_color2 0xFF00F7
#property indicator_label2 "Sell"

//--- indicator buffers
double Buffer1[];
double Buffer2[];

datetime time_alert; //used when sending alert
input bool Send_Email = true;
double myPoint; //initialized in OnInit
int RSI_handle;
double RSI[];
double Low[];
double High[];

void myAlert(string type, string message)
  {
   if(type == "print")
      Print(message);
   else if(type == "error")
     {
      Print(type+" | Fernando Carreiro @ "+Symbol()+","+IntegerToString(Period())+" | "+message);
     }
   else if(type == "order")
     {
     }
   else if(type == "modify")
     {
     }
   else if(type == "indicator")
     {
      if(Send_Email) SendMail("Fernando Carreiro", type+" | Fernando Carreiro @ "+Symbol()+","+IntegerToString(Period())+" | "+message);
     }
  }

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit()
  {   
   SetIndexBuffer(0, Buffer1);
   PlotIndexSetDouble(0, PLOT_EMPTY_VALUE, EMPTY_VALUE);
   PlotIndexSetInteger(0, PLOT_ARROW, 241);
   SetIndexBuffer(1, Buffer2);
   PlotIndexSetDouble(1, PLOT_EMPTY_VALUE, EMPTY_VALUE);
   PlotIndexSetInteger(1, PLOT_ARROW, 242);
   //initialize myPoint
   myPoint = Point();
   if(Digits() == 5 || Digits() == 3)
     {
      myPoint *= 10;
     }
   RSI_handle = iRSI(NULL, PERIOD_CURRENT, 14, PRICE_CLOSE);
   if(RSI_handle < 0)
     {
      Print("The creation of iRSI has failed: RSI_handle=", INVALID_HANDLE);
      Print("Runtime error = ", GetLastError());
      return(INIT_FAILED);
     }
   
   return(INIT_SUCCEEDED);
  }

//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
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 limit = rates_total - prev_calculated;
   //--- counting from 0 to rates_total
   ArraySetAsSeries(Buffer1, true);
   ArraySetAsSeries(Buffer2, true);
   //--- initial zero
   if(prev_calculated < 1)
     {
      ArrayInitialize(Buffer1, EMPTY_VALUE);
      ArrayInitialize(Buffer2, EMPTY_VALUE);
     }
   else
      limit++;
   datetime Time[];
   
   if(BarsCalculated(RSI_handle) <= 0) 
      return(0);
   if(CopyBuffer(RSI_handle, 0, 0, rates_total, RSI) <= 0) return(rates_total);
   ArraySetAsSeries(RSI, true);
   if(CopyLow(Symbol(), PERIOD_CURRENT, 0, rates_total, Low) <= 0) return(rates_total);
   ArraySetAsSeries(Low, true);
   if(CopyHigh(Symbol(), PERIOD_CURRENT, 0, rates_total, High) <= 0) return(rates_total);
   ArraySetAsSeries(High, true);
   if(CopyTime(Symbol(), Period(), 0, rates_total, Time) <= 0) return(rates_total);
   ArraySetAsSeries(Time, true);
   //--- main loop
   for(int i = limit-1; i >= 0; i--)
     {
      if (i >= MathMin(350000-1, rates_total-1-100)) continue; //omit some old rates to prevent "Array out of range" or slow calculation   
      
      //Indicator Buffer 1
      if(??????????????????????????????????????????????????
      ??????????????????????????????????????????????????
      ??????????????????????????????????????????????????
      ??????????????????????????????????????????????????
      ??????????????????????????????????????????????????
      ??????????????????????????????????????????????????
      ??????????????????????????????????????????????????
      
      )
        {
         Buffer1[i] = Low[i]; //Set indicator value at Candlestick Low
         if(i == 1 && Time[1] != time_alert) myAlert("indicator", "Buy"); //Alert on next bar open
         time_alert = Time[1];
        }
      else
        {
         Buffer1[i] = EMPTY_VALUE;
        }
      //Indicator Buffer 2
      if(??????????????????????????????????????????????????
      ??????????????????????????????????????????????????
      ??????????????????????????????????????????????????
      ??????????????????????????????????????????????????
      ??????????????????????????????????????????????????
      ??????????????????????????????????????????????????
      ??????????????????????????????????????????????????
      
      )
        {
         Buffer2[i] = High[i]; //Set indicator value at Candlestick High
         if(i == 1 && Time[1] != time_alert) myAlert("indicator", "Sell"); //Alert on next bar open
         time_alert = Time[1];
        }
      else
        {
         Buffer2[i] = EMPTY_VALUE;
        }
     }
   return(rates_total);
  }
//+------------------------------------------------------------------+
 
  1. Ahmed Abd El Aziz #: BUT I HAVE NO IDEA ABOUT HOW  TO USE CopyBuffer() 

    1. MT4: Learn to code it.
      MT5: Begin learning to code it.

      If you don't learn MQL4/5, there is no common language for us to communicate. If we tell you what you need, you can't code it. If we give you the code, you don't know how to integrate it into your code.

    2. or pay (Freelance) someone to code it. Top of every page is the link Freelance.
                Hiring to write script - General - MQL5 programming forum (2019)

    We're not going to code it for you (although it could happen if you are lucky or the problem is interesting.) We are willing to help you when you post your attempt (using CODE button) and state the nature of your problem.
              No free help (2017)

  2. Perhaps you should read the manual, especially the examples.
       How To Ask Questions The Smart Way. (2004)
          How To Interpret Answers.
             RTFM and STFW: How To Tell You've Seriously Screwed Up.

    They all (including iCustom) return a handle (an int). You get that in OnInit. In OnTick/OnCalculate (after the indicator has updated its buffers), you use the handle, shift and count to get the data.
              Technical Indicators - Reference on algorithmic/automated trading language for MetaTrader 5
              Timeseries and Indicators Access / CopyBuffer - Reference on algorithmic/automated trading language for MetaTrader 5
              How to start with MQL5 - General - MQL5 programming forum - Page 3 #22 (2020.03.08)
              How to start with MQL5 - MetaTrader 5 - General - MQL5 programming forum - Page 7 #61 (2020.07.05)
              How to call indicators in MQL5 - MQL5 Articles (12 March 2010)

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