middleDonchian

[rogerha]

Hi,

Could somebody please give me a brief explanation of barIndex in the context of below. I guess it isn't as simple as inputting -1 to get the last bar data rather than the current ? (Like offset)

middleDonchian( length [, source | sym() | inv()] [, barIndex] )

Thanks

Roger

[ACM]

Roger
In EFS2 you can create a series and then retrieve a specific value in that series. To do this you would first declare the object
var myMidDonchian = middleDonchian(20)
at which point you can retrieve a single value (for example the value of the middle Donchian of two bars ago)
var vMidDonch_2 = myMidDonchian.getValue(-2)
However you can also retrieve the value directly without creating the series. In that case you would write it as
var vMidDonch_2 = middleDonchian(20,-2)
where -2 is the barIndex
Alex

[rogerha]

Thanks Alex, I will investigate further then. I am actually looking at your most recent Ichimoku script, and I am trying make a few subtle changes (colours and alerts) which I can release here when I am successful with a full explanation.