Considerations for Calculate.OnPriceChange

[Shansen]

NT Team,

What considerations are required when restructuring an Indicator from Calculate.OnEachTick to Calculate.OnPriceChange?
Where the Indicator:
- DataSeries type = Minute (i.e. bar type is not set up to remove the last bar on a chart) (NinjaTrader 8),
- does not deal with volume or tick counting (NinjaTrader 8), and
- has references to the most recently completed bar (i.e. Bar[1]).

I am attempting to improve the performance, as per NT8 performance tips (NinjaTrader 8). Noting, "When set to Calculate OnPriceChange, the OnBarUpdate() method is ONLY called when the price has changed which does not necessarily occur the end of the close of the bar" (NinjaTrader 8).

As I understand the above links, under OnPriceChange, OnBarUpdate is only called where price has changed.
The attached Indicator and video (https://www.screencast.com/t/YYb5U68OKO) shows my understanding is wrong.
It appears as though the Indicator OnPriceChange is behaving as I'd expect from OnEachTick.

Any insight is apprecaited.
Thanks
Shannon






However, under Playback, it appearsSo,

[NinjaTrader_BrandonH]

Hello Shansen,

Thank you for your post.

Even if the price has not changed we will still get new OnBarUpdate() iterations for new bar formations when Calculate is set to OnPriceChange. New ticks will create a new bar, not price changes, so OnBarUpdate will be called for the formation of the new bar.

Please let us know if we may assist further.

[Shansen]

Brandon,

Thank you for your quick response.

If I understand you correctly, under Calculate.OnPriceChange OnBarUpdate() occurs:
- at a change in price (i.e. not at a tick of the same price), and
- at the first tick of a new bar.

Your response appears to be in direct conflict with the NT8 HelpGuide: "When set to Calculate OnPriceChange, the OnBarUpdate() method is ONLY called when the price has changed which does not necessarily occur the end of the close of the bar" (NinjaTrader 8).

Please advise where my understanding of the NT8 HelpGuide has gone awry.
I should say, I am happy NT8 conforms to your stated sequence of events.

[NinjaTrader_BrandonH]

Hello Shansen,

Thank you for your note.

You are understanding correctly. When Calculate is set to OnPriceChange, OnBarUpdate will occur when there is a change in price or for the first tick of a new bar.

We will be updating the Help Guide documentation so that the information explains this more clearly.

Please let us know if we may assist further.