Why error in log with NBarsUpEvent in for loop

[Lonneman]

Hi, I am trying to check if there was an NBarsUp or -Down event during the last 7 bars. I tried this, but it doesn't work and I get an error message in the log: "Error on calling 'OnBarUpdate' method [...] You are accessing an index with a value that is invalid since its out of range.":

  protected override void OnBarUpdate()
        {
            if (CurrentBar < 45)
                return;            
            
            bool bNBarsUpEvent = false;
            bool bNBarsDownEvent = false;
            
            for (int i = 0; i <= 7; i++)
            {
                double valueUp = NBarsUp(nBarsPeriod, true, true, true)[i]; 
                double valueDown = NBarsDown(nBarsPeriod, true, true, true)[i]; 

                if (valueUp == 1)                
                {
                    bNBarsUpEvent = true;    
                    BackColor = Color.Green;                        
                }                
                
                if (valueDown == 1)                
                {
                    bNBarsDownEvent = true;    
                    BackColor = Color.Red;                        
                }            
            }            
        }

I don't understand why it's not working.

[NinjaTrader_RyanM1]

Hello Lonneman,

I would first try using our built in method CountIf() for this. Example usage below- checks if there has been any occurrence of NBarsup 3 within the last 7 bars and marks with a diamond.


if (CountIf(delegate {return NBarsUp(3, true, true, true)[0] == 1;}, 7) > 0)
{
DrawDiamond("" + CurrentBar, true, 0, High[0], Color.Red);
}