iBands function for a specific Bar


I want to get the result of the iBands() indicator function on the bar which I like, for example the third bar from the recent bars on the chart that my EA is attached.

How can I get that?

How can I accomplish that?

the following: just returns the latest number of the iBands for the latest price on the chart:

double myVar;

   myVar=(iBands(NULL,0, 20, 2, 0, PRICE_CLOSE, MODE_MAIN, 0));

someone please help me!

double  iBands(
   string       symbol,           // symbol
   int          timeframe,        // timeframe
   int          period,           // averaging period
   double       deviation,        // standard deviations
   int          bands_shift,      // bands shift
   int          applied_price,    // applied price
   int          mode,             // line index
   int          shift             // shift

Alain Verleyen
  myVar=iBands(NULL,0, 20, 2, 0, PRICE_CLOSE, MODE_MAIN, 3);