Can't input DataSeries to custom JMA

[poseidon_sthlm]

Hi! I have migrated my custom indicators to NT7b14 and it went rather smooth. But I have a problem with a custom JMA indicator, JMA(int Length, int Phase), that I use alot. I have finally figured out that the probelm occurs when one use a DataSeries as input to the JMA indicator . i.e. JMA(Close, Length, Phase). It then throws the error message:
"Error on calling 'OnBarUpdate' method for indicator 'JMA' on bar 31: You are accessing an index with a value that is invalid since its out of range. I.E. accessing a series [barsAgo] with a value of 5 when there are only 4 bars on the chart."

This worked fine in NT 6.5. What could cause this problem in NT7?

/Regards

[NinjaTrader_Brett]

Do you have the code to check to make sure you have enough bars in JMA as this is what this error points too.

http://www.ninjatrader-support2.com/vb/showthread.php?t=3170

Is JAM a MultiSeries indicator? Also, do you use arrays in JAM as these will also need to be checked live the above example.

[NinjaTrader_JoshP]

poseidon_sthlm,

If your indicator uses data points older than 256 bars you will want to be sure to create your DataSeries as one that uses Infinite bars lookback instead of using the new memory optimization features that limit it to 256.

myDataSeries = new DataSeries(this, MaximumBarsLookBack.Infinite);

Please be sure to also run the UI option when you add the indicator for max bars look back to infinite as well.

[poseidon_sthlm]

Thanks for your reply. I have isolated the problem with try- catch blocks and adjusted the code. The problem was that a DataSeries variable with index [1] was used when asigning another variable although no value had yet been asigned to the DataSeies variable. The indicator did also asign values to DataSeries variables directly without a set method.

if (i > 30)
{
  dataSeries[0] = var1;
   var2 = dataSeries[0]  + dataSeries[1]; // On bar 31 yet no value has been asigned to dataSeries[1]
}

How come that this code didn't throw an error message in NT 6? And why does this code work in NT7 if you add the indicator to a primary barseries but not if you input a DataSeries variable to the indicator?

Is it sufficient to use the stament
(MaximumBarsLookBack = MaximumBarsLookBack.Infinite in the Initialize method
or do you have to use the MaximumBarsLookBack.Infinite argumnet when initializing a new DataSeries too?
(myDataSeries = new DataSeries(this, MaximumBarsLookBack.Infinite);

/Regards

[NinjaTrader_Brett]

Hello,

Just wanted to let you know that we recieved your note and you will get a response from me or another NinjaScript support team member soon.

Thank you for your patience.

[NinjaTrader_JoshP]

You will have to use the new DataSeries(this, MaximumBarsLookBack.Infinite) if you are trying to use infinite for your DataSeries.

In 6.5 and 7, either of them, you would want to be checking that you have actually set values otherwise you will get invalid values anyways.