(MQL4) How to code previous or first indicator data?

Get the RSI values into an array, use iMAonArray to get the MA of the RSI, find the cross.

Can I please any MQL SYNTAX example according to following image?

   int i;
   int limit;
   int counted_bars=IndicatorCounted();
   
   //---- check for possible errors
   if(counted_bars<0) return(-1);
   
   //---- last counted bar will be recounted
   if(counted_bars>0) counted_bars--;
   limit=Bars-counted_bars;
 
   //--- main loops 1 and 2
   for(i=0; i < limit; i++)
      {
        RSIBuffer[i]=iRSI(Symbol(),0,RSIPeriod,PRICE_CLOSE,i);
      }
  
   for(i=0; i < limit; i++)
      {
        MAofRSIBuffer[i]=iMAOnArray(RSIBuffer,0,MAofRSI,0,MA_method,i);
      }
 

search for cross means RSIBuffer[i+1]>MAofRSIBuffer[i+1] and RSIBuffer[i]<MAofRSIBuffer[i]

or    RSIBuffer[i+1]<MAofRSIBuffer[i+1] and RSIBuffer[i]>MAofRSIBuffer[i]

or

(RSIBuffer[i+1] - MAofRSIBuffer[i+1]) * (RSIBuffer[i] - MAofRSIBuffer[i]) < 0

or

bool wasAbove = RSIBuffer[i+1] > MAofRSIBuffer[i+1],
      isAbove = RSIBuffer[i]   > MAofRSIBuffer[i],
     isCross  = isAbove != wasAbove;

It doesn't work ! In my EA I have created the following function to check MA on RSI ARRAY. But I have only SELL signal.

Following there is my code. What I made wrong?

int CheckMaOnRsi()
{
   int i;
   int limit;
   int counted_bars=IndicatorCounted();
   double RSIBuffer[], MAofRSIBuffer[];   
   
   /* check for possible errors */
   if(counted_bars<0) return(-1);
   
   /* last counted bar will be recounted */
   if(counted_bars>0) counted_bars--;
   limit=Bars-counted_bars;
 
   /* main loops 1 and 2 */
   for(i=0; i < limit; i++)
      {
        RSIBuffer[i]=iRSI(Symbol(),0,ARRAY_RSI_PERIOD,ARRAY_RSI_PRICE,i);
        MAofRSIBuffer[i]=iMAOnArray(RSIBuffer,0,ARRAY_MA_PERIOD,0,ARRAY_MA_METHOD,i);
        if ((RSIBuffer[i+1] - MAofRSIBuffer[i+1]) * (RSIBuffer[i] - MAofRSIBuffer[i]) < 0) {return(-1);}
        if ((RSIBuffer[i+1] - MAofRSIBuffer[i+1]) * (RSIBuffer[i] - MAofRSIBuffer[i]) > 0) {return(1);}
        
        /*
        
        // OR
        
        if (RSIBuffer[i+1]>MAofRSIBuffer[i+1] && RSIBuffer[i]<MAofRSIBuffer[i]) {return(-1);}
        if (RSIBuffer[i+1]<MAofRSIBuffer[i+1] && RSIBuffer[i]>MAofRSIBuffer[i]) {return(1);}
        */
      }
   

return(0);
}

You cannot use Indicator code in an EA.  for example,  IndicatorCounted(),  from here:  https://docs.mql4.com/customind

 "These functions cannot be used in experts and scripts."

Hi RaptorUK, Should I create the separate indicator with the following code? And after create indicator should I use iCustom() funtion in order to use it in my EA ?

  int i;
   int limit;
   int counted_bars=IndicatorCounted();
   
   //---- check for possible errors
   if(counted_bars<0) return(-1);
   
   //---- last counted bar will be recounted
   if(counted_bars>0) counted_bars--;
   limit=Bars-counted_bars;
 
   //--- main loops 1 and 2
   for(i=0; i < limit; i++)
      {
        RSIBuffer[i]=iRSI(Symbol(),0,RSIPeriod,PRICE_CLOSE,i);
      }
  
   for(i=0; i < limit; i++)
      {
        MAofRSIBuffer[i]=iMAOnArray(RSIBuffer,0,MAofRSI,0,MA_method,i);
      }

That would probably be the simplest way.