Difference between State.DataLoaded and State.Historical

[germanf]

Hi everyone,
I've already read the guide regarding this two states, but I don't have it clear enough...
Lets suppose I want to add two EMA that will be used in my script in OnBarUpdate section, so I write the following code in State.DataLoaded. In that way, the script works as expected, but, is it also necessary or recommended to set them in State.Historical? Will it suppose any difference?

.......
else if (State == State.DataLoaded)
{
EMA1 = EMA(Close, 5);
EMA2 = EMA(Close, 10);
}

else if (State == State.Historical)
{
EMA1 = EMA(Close, 5);
EMA2 = EMA(Close, 10);
}
......

Thanks in advance for your support.

[NinjaTrader_BrandonH]

Hello germanf,

Thanks for your post.

The best practice is to instantiate indicators in OnStateChange() when the State == State.DataLoaded. State.DataLoaded will be called one time after ALL data series have been loaded. This is the state where you should use logic that needs to access data-related objects like Bars, Instruments, BarsPeriod, TradingHours or instantiating indicators.

State.Historical is called once an object is processing historical data. For example, this state is called once when running an object in real-time. This is the state that notifies you that the object is processing historical data.

See this help guide page for more information: https://ninjatrader.com/support/help...tatechange.htm

Let me know if I may further assist

[germanf]

Hi Brandon, thanks for your prompt response.

So, if I understood well, instantiating the indicators only have to be done in State.DataLoaded.
Instantiating them in State.Historical is not necessary, no matter working in real time or if I just want to have a look what the indicators have done in the loaded bars of the chart.

Then, my code would be just like this...

else if (State == State.DataLoaded)
{
EMA1 = EMA(Close, 5);
EMA2 = EMA(Close, 10);
}
protected override void OnBarUpdate()
{
if (EMA1 < EMA2){ do something }
}

Am I right?

[NinjaTrader_BrandonH]

Hello germanf,

Thanks for your note.

That would be correct. Indicators would only need to be instantiated in State.DataLoaded as seen in the code you shared.

Let me know if you have any further questions.