{Ninjascript} NT8 / isFirstBarOfSession

[fscabrera03]

Dear all, hope you are fine.
Im having trouble, next code should return "First Bar Of Session" one time on the first bar of the session but returns "First Bar Of Session" 3 times every first bar of session.
My code:

Calculate = Calculate.OnEachTick;

protected override void OnBarUpdate()
{
if(IsFirstTickOfBar)
{

if(Bars.IsFirstBarOfSession)
{
Print("First Bar Of Session");
}

}

}

The code is printing "First Bar Of Session" in the 3 first bars (please find attached).
Should print one time, only in the first bar of the session. Can the calculate mode affect this? I need to use OnEachTick.

Thank you somuch

[bltdavid]

Are you loading any additional data series in your script?

Try also printing the value of BarsInProgress inside your Print statement.

[NinjaTrader_PaulH]

Hello fscabrera03,

Thanks for your post.

As member bltdavid asked, do you have additional data series in your script?

What bar type are you apply the script to?

[nandocabrera87]

Hello, Im fscabrera03 (i cannot reset my password).
Im using :
playback connection
Im not using data series
Im using renko bars.

Thank you

[NinjaTrader_PaulH]

Hello nandocabrera87 / fscabrera03,

Thanks for your reply.

Here is a link to reset your password: https://ninjatrader.com/support/forum/lostpw Please note that you would have to complete registration by replying to the activation e-mail.

I've been able to recreate your observations and we are looking into this further. I will update this thread when I have further information.

[fscabrera03]

Thank you! I recovered the account.
It´s great if you can recreate that.
I await your comments.
Regards

[NinjaTrader_PaulH]

Hello fscabrera03,

Thanks for your patience.

The Renko bars use RemoveLastBar() method which means that once the bar has finished its price movement it is removed and redrawn as the final bar. This removal and redraw triggers the first tick and first bar of the session multiple times, as you have observed. You would not see this behavior in time-based bars or any bar that does not use IsRemoveLastBar.

https://ninjatrader.com/support/helpGuides/nt8/?isremovelastbarsupported.htm

What we recommend would be to use your own bool that will change state the first time the condition occurs. You would also need to reset that bool for the session, at a later point.

if (Bars.IsFirstBarOfSession && IsFirstTickOfBar && doitonce)
{
doitonce = false; // to prevent multiple first bar of session
// your other once a session stuff here
}

You will need to come up with another condition to reset the bool doitonce back to true such as a specific time before the end of the session

[fscabrera03]

Hello Paul, how are you?
There are some kind of bar id? or some atribute that refers to a specific bar.
I want to use this to store bar id on doitonce and ask every time that this specific bar is executed only one time.
Thank you!

[bltdavid]

Use CurrentBar.

This number is unique for each bar on a per chart basis.

Each new bar just gets the next number. That is, the value
of CurrentBar advances by 1 for each newly closed bar.

This is an automatic thing.

Meaning each time your OnBarUpdate is called, the value
of CurrentBar will be +1 compared to the last time, assuming
Calculate is 'OnBarClose'.

[NinjaTrader_PaulH]

Hello fscabrera03,

Thanks for your post.

Member bltdavid has advised using CurrentBar which is the systems bar counter.

Reference: https://ninjatrader.com/support/help...currentbar.htm