fix standard functions

StdDev/StdDev.mq4

@@ -57,17 +57,17 @@ int OnCalculate(const int rates_total, const int prev_calculated, const datetime
 	double dAPrice, dAmount, dMovingAverage;
 	
 	//---- insufficient data
-	if (Bars <= ExtStdDevPeriod)
+	if (rates_total <= ExtStdDevPeriod)
 		return(0);
 
 	//---- bars count that does not changed after last indicator launch.
-	nCountedBars = IndicatorCounted();
+	nCountedBars = prev_calculated;
 
 	//----Standard Deviation calculation
-	i = Bars - ExtStdDevPeriod - 1;
+	i = rates_total - ExtStdDevPeriod - 1;
 	
 	if (nCountedBars > ExtStdDevPeriod)
-		i = Bars - nCountedBars;
+		i = rates_total - nCountedBars;
 
 	while (i >= 0)
 	{