indicator of a multiintrument

[nightriderx]

I am trying to set up a strategy in which one of the checks is to see if the price is greater than to lower Bollinger Band. However when i call on the Bollinger (or just SMA) it is giving me crazy results as it uses the input of all instruments. Can you please advise?
thx!

[nightriderx]

*this Bollinger check is being done inside another indicator

[NinjaTrader_RyanM1]

Hello nightriderx,

You can see a sample multi instrument implementation through Tools > Edit NinjaScript > Strategy.

If you can share the code snippet you're working with, we can take a look and offer input.

[nightriderx]

ok so for example to get the closing price of the first instrument i would have:

Closes[0][0]

...of the second instrument...

Closes[1][0]

How can I see if Closes[1][0] is > than the Lower Bollinger Band of instrument [1]

[NinjaTrader_RyanM1]

You can use BarsArray [ ] in the Bollinger expression.

if (Closes[1][0] > Bollinger(BarsArray[1], 13, 3).Lower[0])

[nightriderx]

tried it but am now getting:

Error on calling 'OnBarUpdate' method for indicator '_' on bar 1: 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.

using:
Print ("wma 50-10: "+ WMA(BarsArray[0],50)[10]);

I know in a strategy I have to increase the look back period, how do I fix this in an indicator, which as I understood should start plotting/returning data once enough bars are gathered?

thx!

[NinjaTrader_RyanM1]

You need to follow principles here:
Make sure you have enough bars in the data series you are accessing

You may need a check similar to

if (CurrentBar < 10) return;

If you need this check for another series, it's with CurrentBars [ ] and then an index value indicating the series.

http://www.ninjatrader.com/support/helpGuides/nt7/currentbars.htm