Bug in Ninjatrader7?

[baqer110]

Hi!
Try this indicator named 'ninjaBug'

// This namespace holds all indicators and is required. Do not change it.
namespace NinjaTrader.Indicator
{

[Description("Ninja -Bug Exposed")]
public class ninjaBug : Indicator
{
#region Variables

private DataSeries mydataseries;
#endregion


protected override void Initialize()
{
Overlay = true;
mydataseries = new DataSeries(this);
}

protected override void OnBarUpdate()
{
if (CurrentBar < 10)
return;
mydataseries.Set(High[0] - Low[0]);

if (mydataseries[-1] > mydataseries[0] && mydataseries[2] > mydataseries[1])


DrawArrowDown(mydataseries[0].ToString(), true, 0, High[0] + TickSize, Color.Red);
Simple code. No compilation error. Apply this indicator on your chart
NINJATRADER WILL CRASH!!
Now re-phrase if condition like this

if (mydataseries[2] > mydataseries[1] && mydataseries[-1] > mydataseries[0])

it is one and same but shuffled. Compile it. and apply indicator - It will work and plot arrow

[NinjaTrader_PatrickH]

baqer110,

So this is what you refer to in your previous thread: http://www.ninjatrader.com/support/f...ad.php?t=81865

I would not recommend accessing -1 in the DataSeries, it has no values yet. While this may work on historical bars, in real-time this is going to cause issues like crashing.

Refer to my other response to you on accessing values ahead of the current bar: http://www.ninjatrader.com/support/f...ad.php?t=81780
You will notice in the sample I completely ignored your idea of using negative indexes and went back the required or needed number of bars (2 for the index in that example).

[baqer110]

baqer110,

So this is what you refer to in your previous thread: http://www.ninjatrader.com/support/f...ad.php?t=81865

I would not recommend accessing -1 in the DataSeries, it has no values yet. While this may work on historical bars, in real-time this is going to cause issues like crashing.

Refer to my other response to you on accessing values ahead of the current bar: http://www.ninjatrader.com/support/f...ad.php?t=81780
You will notice in the sample I completely ignored your idea of using negative indexes and went back the required or needed number of bars (2 for the index in that example).

Thanks a lot and I really do appreciate your valuable time given to me
My point was that both "if statements are one and same" Only difference is in one "if" condition [-] index is used first and applied to chart and NT crashes. In second one [-] applied in the 2nd condition and applied to chart. It worked well and NT didn't crash.
You are right. I was applying [-] to find short/medium term/long term high low. For short term no problem. For medium term I had to use loop to separate short term high from the private series. Look back loop worked ok but look forward had to use negative [-] . Compilation no error but NT was crashing.
The code you have sent me I imported to NT and applied to chart. Its not plotting anything. No compilation error. I am studying the to find out the problem. Can you please apply at your end and guide me?
Once again I do appreciate your valuable time

[NinjaTrader_PatrickH]

Hello baqer110,

Thank you for your response.

The behavior that you see would somewhat be unexpected no matter as the negative index on a DataSeries is not really accurate in this case. So it may work or it may not. I will follow up on the other post.