iCustom applied price: new bar value modify the previous one?

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Hi,

while developing a non banal custom indicator I met a strange behaviour which I cannot grasp fully. The indicator is intended not to be calculated for the open bar. In other words, it is supposed to calculate position J only when position J+1 appears (= bar J completed)

Below you can find the main loop which should allow for that.

My problem is: price[J]  value doesn't get frozen when a new bar appears (rates_total > prev_calculated) but it assumes a avalue which:

                    a) does not match the value plotted on the chart

                    b) it gets its final value only 1-2 ticks after the new bar appearance

I wish to understand better the logic beneath in order to code properly


double  Buf[];

int OnInit()
 {
  SetIndexBuffer(0,Buf,INDICATOR_DATA);

  return(INIT_SUCCEEDED);
 }
//--------------------------------------------------------
int OnCalculate(const int rates_total,const int prev_calculated,const int begin,const double &price[])
 {
  int J,jSTART;

// NO NEW BAR -> RETURNS (**))
  if(rates_total==prev_calculated) return(rates_total);

// FIRST CALL OR NEW BARS -> EXEC CALCULATIONS 
  if(prev_calculated==0)
   {
    jSTART=prev_calculated;   // 1st call: starts from bar 0 
   }     
  else                  
   {
    jSTART=prev_calculated-1; // other calls: starts from the bar before the open bar (see **)  
   } 
  
// MAIN CALCULATING CYCLE 
  for(J=jSTART;J<(rates_total-1);J++) //calculation stops before the open bar
   {        
    Buf[J]=......;   
   }

   Buf[rates_total-1]=EMPTY_VALUE; //Empties open bar value 

  return(rates_total);
 }
 
Paolo: My problem is: price[J]  value doesn't get frozen when a new bar appears (rates_total > prev_calculated) but it assumes a avalue which:

                    a) does not match the value plotted on the chart

                    b) it gets its final value only 1-2 ticks after the new bar appearance

Price[J] is the problem, but you don't show it.

Do you really expect an answer? There are no mind readers here and our crystal balls are cracked. Always post all relevant code.
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          Be precise and informative about your problem

We can't see your broken code.

Fix your broken code.

With the information you've provided — we can only guess. And you haven't provided any useful information for that.

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