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help to use "Indicators: Linear Regression Channel " as a sub program function for mt4 in mql4 - page 2

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Alexey Volchanskiy:
Where is bars or candles in chart?

file you attached work , and i modified mine as same as it, but still dont work.

as you can see in last pic.i posted above, the time OR CANDLE IS true,

but the value for price, that must be equal to " LR_line[] " is always zero.

Mehrdad Shiri:
stil same problem.

Try to specify ArrayResize and ArraySetAsSeries for variables LR_line [], Sup_line [] and Res_line [].

void LinearRegressionChannel(bool Use_Close,int barsToCount,datetime q, double w  )
   {
    Use_Close = true;
    barsToCount=50;
    double LR_line[];
    double Sup_line[];
    double Res_line[];
    ArrayResize(LR_line,50);
    ArrayResize(Sup_line,50);
    ArrayResize(Res_line,50);
    ArraySetAsSeries(LR_line,false);
    ArraySetAsSeries(Sup_line,false);
    ArraySetAsSeries(Res_line,false);
    // variables
    double a,b,c,
           sumy=0.0,
           sumx=0.0,
           sumxy=0.0,
           sumx2=0.0,
           h=0.0,l=0.0;   
    int x;
    // calculate linear regression
    for(int i=0; i<barsToCount; i++)
       {
        sumy+=Close[i];
        sumxy+=Close[i]*i;
        sumx+=i;
        sumx2+=i*i;
       }
    c=sumx2*barsToCount-sumx*sumx; 
    if(c==0.0)
      {
       Alert("Error in linear regression!");
       return;
      }
    // Line equation    
    b=(sumxy*barsToCount-sumx*sumy)/c;
    a=(sumy-sumx*b)/barsToCount;
    // Linear regression line in buffer
    for(x=0;x<barsToCount;x++)
        LR_line[x]=a+b*x;
    // Use PRICE_CLOSE for support-resistance
    if (Use_Close)
     for(x=0;x<barsToCount;x++)
     {
      if(Close[x]-LR_line[x] > h) h = Close[x]-LR_line[x];
      if(LR_line[x] - Close[x]> l) l = LR_line[x] - Close[x];
     }   
    // Use HIGH - LOW
    else
     for(x=0;x<barsToCount;x++)
     {
      if(High[x]-LR_line[x] > h) h = High[x]-LR_line[x];
      if(LR_line[x] - Low[x]> l) l = LR_line[x] - Low[x];
     }
    
    // Drawing support - resistance lines   
   if (h>l)
   {
     for(x=0;x<barsToCount;x++)
     {
       Sup_line[x]=a-h+b*x;
       Res_line[x]=a+h+b*x;
     } 
   }
   else
   {
     for(x=0;x<barsToCount;x++)
     {
       Sup_line[x]=a-l+b*x;
       Res_line[x]=a+l+b*x;
     }
   }
   /*
   LR_line[x]  = 0.0;
   Sup_line[x] = 0.0;
   Res_line[x] = 0.0;
   */
   
   q=Time[49];
   w=LR_line[49];

   /* chart can't have two or more objects with same name
      these are two decisions for resolve this problem
      1. Create LRC in OnInit and set coordinats Time[49],LR_line[49],Time[1],LR_line[1]
      by call ObjectSetDouble() here
      2. Delete LRC  before it create
   */   
   ObjectDelete(0, "LRC"); // method 2    
   if(!ObjectCreate(0,"LRC",OBJ_TREND,0,Time[49],LR_line[49],Time[1],LR_line[1]))
        { Print(" can not draw LRC: ", GetLastError());};
   return;
   }

// also delete line in OnDeinit
void OnDeinit(const int reason)
  {
  ObjectDelete(0, "LRC"); // method 2    
   
  }


   
int OnInit()
  {
   return(INIT_SUCCEEDED);
  }

:-)

what a mistake, problem solved, thank you,

thank for all freind's help.

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