Error with DataSeries

[neo_trader]

Hi,

I am trying to use Bollinger Bands for my custom made MA. However, I get an error saying the 'Values[0]' does not exist in the current context. I have defined them in properties as per the Indicator code of Bollinger Bands :

[Browsable(false)]
[XmlIgnore()]
public DataSeries Lower
{
get { return Values[0]; }
}

/// <summary>
/// Get the upper value.
/// </summary>
[Browsable(false)]
[XmlIgnore()]
public DataSeries Upper
{
get { return Values[0]; }
}


Can you please tell me why I am getting this error for Values[0] ?

Thanks,

Neo

[NinjaTrader_RyanM1]

Hello Neo_trader,

One issue with the snippet you posted is the Values index[ ] needs to be incremented by one for each series defined.

/// Get the upper value.
/// </summary>
[Browsable(false)]
[XmlIgnore()]
public DataSeries Upper
{
get { return Values[[COLOR=red][B]1[/B][/COLOR]]; }
}

However you shouldn't need to code in properties for Bollinger Band in a strategy. The indicator and all associated properties are called automatically.

Let us know what you're trying to do with Bollinger and we can assist further. If you wanted a moving average of bollinger bands for example, you could write:
SMA(Bollinger(2, 14).Upper, 14)[0]

[neo_trader]

What I am trying to do is use Bollinger on a Spread Value (between two instruments). So I want to create an entry based on the Spread value crossing the Bollinger Upper, Lower and Middle values. How can I use these three values in my strategy using the Bollinger (Spread,Period) function. Please assume the Spread here is a DataSeries.

Neo

[NinjaTrader_RyanM1]

Neotrader,

Bollinger can take a dataseries as input. Below snippet will plot based on the three elements of Bollinger, accepting spread as data series input:

Plot0.Set(Bollinger(spread, 2, 14)[0]);
Plot1.Set(Bollinger(spread, 2, 14).Upper[0]);
Plot2.Set(Bollinger(spread, 2, 14).Lower[0]);

http://www.ninjatrader-support.com/HelpGuideV6/Bollinger.html