Question: IsFirstBarOfSessionByIndex()

[misova]

Hi,
I tested, how method Bars.IsFirstBarOfSessionByIndex() works,
but it seems it does not work, but returns true for each bar.

I tested on M15 timeframe, with this simple code:

 
[FONT="Courier New"]protected override void OnBarUpdate()
{
      /[SIZE="2"][COLOR="DimGray"]/ Check, if current bar is first bar of session[/COLOR][/SIZE]
      Value[0] = Bars.I[COLOR="Red"]sFirstBarOfSessionByIndex(0)[/COLOR] ? 1 : 0;
}[/FONT]

Result is, that all values are 1 = that means, it says each bar is first bar of session,
which is wrong obviously.

When I replace it with IsFirstBarOfSession, then it works fine.

 
[FONT="Courier New"]protected override void OnBarUpdate()
{
      Value[0] = Bars.[COLOR="Green"]IsFirstBarOfSession [/COLOR]? 1 : 0;
}[/FONT]

Can you explain, why the IsFirstBarOfSessionByIndex(idx) method does not work
and return value 'true' everytime ?

[ren37]

Try this

protected override void OnBarUpdate()
{
      // Check, if current bar is first bar of session
      Value[0] = Bars.IsFirstBarOfSessionByIndex(CurrentBar) ? 1 : 0;
}

http://ninjatrader.com/support/helpG...ionbyindex.htm

[misova]

Thank you ren37,
you are completely right.

Documentation is quite insufficient / misleading.
It suggests using indexes, but do not tell from which side

Standard and clear vocabulary should be used across whole documentation,
to clearly differentiate, between indexing from left side vs right side of the data-series.

Now, it is mixed up. Everything is just some indexing, but requirements differ across various methods and properties. Maybe there is some system, but it is not clear for me from the docs...