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My BarsSinceN might help do what you want (which is not entirely
clear to me). I just figured it out for another purpose.
function BarsSinceN ( expression, n )
// Return number of bars since expression was true n times.
// If less than n, return value of BarIndex().
{
return (BarIndex() - Nz(ValueWhen ( expression, BarIndex(),
n )));
}
So if you want bars since the second to last time X happened, call
BarsSinceN( X, 2 ).
If you want the bar index when that happened, use BarIndex() -
BarsSinceN ( X, 2 ). If you want the value of another array, Y, when
that happened, use Ref ( Y, - BarsSinceN( X, 2 ) ), or more simply
ValueWhen( X, Y, 2 ), except ValueWhen will return null values before
the first 2 occurances.
--- In amibroker@xxxxxxxxxxxxxxx, "bernardedmond01"
<bernardedmond01@xxx> wrote:
>
> Hi
> If I were buying on an upward cross of RSI(15) but I wanted to use
as a
> reference point the previous cross, how would I refer to this
previous
> cross? I don't want to use the "Barssince" function because there
could
> be either zero or multiple crosses in my chosen timeframe - I just
> simply want to know when the last one occurred.
> Thanks
>
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