BarDelta calculation- Delta Bar

[yosaam]

Hi all, i am not sure why when i calculate current bar delta using this code (barsType.Volumes[CurrentBar].BarDelta ) it gives me the correct number but when try to calculate one bar ago using this code (barsType.Volumes[1].BarDelta ) it doesn't give me the correct number? can you please advise?

[bltdavid]

Using '1' for 'one bar ago' is incorrect thinking.

The BarDelta value on the previous bar is this,

barsType.Volumes[CurrentBar-1].BarDelta

The documentation for Volumetric bars clearly states
that the index being used is not a BarsAgo reference,
so using an index of '1' is not appropriate here.

Scroll to the bottom of this page,

https://ninjatrader.com/support/helpGuides/nt8/NT%20HelpGuide%20English.html?language_reference_wip.htm

"Please note in the example above a CurrentBar
reference is used as index, and not a BarsAgo
reference."

[yosaam]

		Thank you bltdavid for your response. but when i tried the code it gave me the following exception: Error on calling 'OnBarUpdate' method on bar 0: Index was outside the bounds of the array.

can you please advise?

[NinjaTrader_ChelseaB]

Hello yosaam,

May I confirm you have a condition to confirm that CurrentBar is greater than 1?

if (CurrentBar < 1)
return;

Below is a link to a forum post on indexing errors.

https://ninjatrader.com/support/forum/forum/ninjatrader-8/indicator-development/1046200-indicator-that-calculate-in-different-chartime?p=1048513#post1048513

[yosaam]

Thank you so much Chelsea. it's working now after i added the:
if (CurrentBar < 1)
return;