DonchianChannel problem

[oldboy]

Hello. I'm newbie in writing ninjascript. I have created a very simple to learn more. But when I apply it to the chart, it cannot come out any result. Would anyone please kindly help to tell me what's wrong in the script. many thanks.

// Condition set 1
if (High[0] > DonchianChannel(14).Upper[25])
{
DrawDot("My dot" + CurrentBar, true, 0, Low[0] + -5 * TickSize, Color.Blue);
}


I just want it to plot a dot when the high of current bar is higher than the highest of 14 bars with starting from 25 bars ago.

[NinjaTrader_RyanM1]

Hello oldboy,

Thanks for the post and welcome to the NinjaTrader forums. You will likely see an error on the log tab of the control center for this.

Please see here for most likely reason why your indicator does not draw:

http://www.ninjatrader.com/support/forum/showthread.php?t=3170

To resolve, add something like this to prevent processing for the first so many bars.
if (CurrentBar < 25) return;

[oldboy]

Dear Ryan,

many thanks for your speedy reply. I read the post and edit my code. I have tried three ways but unfortunately the error in log still exist. Here is those I have tried.

1.
protected override void OnBarUpdate()
{
if(CurrentBar<25)
return;
// Condition set 1

if (High[0] > DonchianChannel(14).Upper[25])
{
DrawDot("My dot" + CurrentBar, true, 0, Low[0] + -5 * TickSize, Color.Blue);
}
}

2.
protected override void OnBarUpdate()
{
// Condition set 1

if (High[0] > DonchianChannel(14).Upper[25][Math.Min(CurrentBar,25)])
{
DrawDot("My dot" + CurrentBar, true, 0, Low[0] + -5 * TickSize, Color.Blue);
}
}

3.
protected override void OnBarUpdate()
{
if(CurrentBar<25)
return;
// Condition set 1

if (High[0] > DonchianChannel(14).Upper[25][Math.Min(CurrentBar,25)])
{
DrawDot("My dot" + CurrentBar, true, 0, Low[0] + -5 * TickSize, Color.Blue);
}
}

[NinjaTrader_RyanM1]

What is the error message you get in log tab? After making any code changes did you also Right Click > Reload NinjaScript from your chart?

[oldboy]

I have reload after each change. And the error is the same like this.

"Error on calling 'OnBarUpdate' method for strategy 'MyCustomStrategy': Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index,"

Many thanks.

[NinjaTrader_RyanM1]

I'm not sure. I copy-pasted exactly using your approach #1 and I'm able to see dots.

What are the details of the chart you're applying this to?

• Instrument
• Interval
• Data Provider
• Days to load

If it helps, I attached the script I'm using here. Can import it using File > Utilties > Import NinjaSCript.

[oldboy]

Dear Ryan,

The script is created on NT 6.5. And I upgrade to 7.0 and recreate again. It works. Cheers.