How To Explain the difference between this indicators draw and the line chart

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#property indicator_chart_window 
#property indicator_buffers 1 
#property indicator_plots   1 
//--- indicator buffers 
double         MABuffer[]; 
//+------------------------------------------------------------------+ 
//| Custom indicator initialization function                         | 
//+------------------------------------------------------------------+ 
void OnInit() 
  { 
//--- Bind the Array to the indicator buffer with index 0 
   SetIndexBuffer(0,MABuffer,INDICATOR_DATA); 
//--- Set the line drawing 
   PlotIndexSetInteger(0,PLOT_DRAW_TYPE,DRAW_LINE); 
//--- Set the style line 
   PlotIndexSetInteger(0,PLOT_LINE_STYLE,STYLE_DOT); 
//--- Set line color 
   PlotIndexSetInteger(0,PLOT_LINE_COLOR,clrRed); 
//--- Set line thickness 
   PlotIndexSetInteger(0,PLOT_LINE_WIDTH,1); 
//--- Set labels for the line 
   PlotIndexSetString(0,PLOT_LABEL,"Moving Average"); 
//--- 
  } 
//+------------------------------------------------------------------+ 
//| 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[]) 
  { 
//---  
   for(int i=prev_calculated;i<rates_total;i++) 
     { 
      MABuffer[i]=close[i]; 
     } 
//--- return value of prev_calculated for next call 
   return(rates_total); 
  }






It is starting good but at the end this indicator draw with 1 shift ahead Why ?



Thanks for your interest.

Files:
Question.png  31 kb
  
for(int i=(int)MathMax(0,prev_calculated-1); i<(int)MathMax(1,rates_total); i++)
prev_calculate==rates_total most of the time, that's why it's not updating the last bar after the first tick of it so it looks like it's shifted (actually it shows the open, not the close)
 
kypa:
A function call on each iteration is not efficient. Better to use variables.
 
Doesn't 'for' function calculate start and end values only once at the beginning? I could be wrong, of course, I'm often wrong.
 
kypa:
Doesn't 'for' function calculate start and end values only once at the beginning? I could be wrong, of course, I'm often wrong.

Right for the start, but this condition is evaluated on each iteration :

i<(int)MathMax(1,rates_total)
 

I'm totally wrong.

This:

int prev_total_calculated_rates(int index, int value)
  {
   Print(IntegerToString(index));
   return(value);
  }

instead of rates_total and prev_calculated if what I though is right shouldn't print more than once but it does.

About the second condition - I don't remember the reason I wrote it so, but it's not really necessary, just i<rates_total should be fine.


The fix for OP's test should be this:

int rates_zero=(int)MathMax(0,prev_calculated-1);
for(int i=rates_zero; i<rates_total; i++)
 
kypa:

I'm totally wrong.

This:

instead of rates_total and prev_calculated if what I though is right shouldn't print more than once but it does.

About the second condition - I don't remember the reason I wrote it so, but it's not really necessary, just i<rates_total should be fine.


The fix for OP's test should be this:

Okey, let me try it 

 
kypa:

I'm totally wrong.

This:

instead of rates_total and prev_calculated if what I though is right shouldn't print more than once but it does.

About the second condition - I don't remember the reason I wrote it so, but it's not really necessary, just i<rates_total should be fine.


The fix for OP's test should be this:

It's working thanks

 
Alain Verleyen:
A function call on each iteration is not efficient. Better to use variables.

thanks for your interest 

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