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Bernard,
C<Ref(C,-4) gives ==1 when C is smaller than Ref(C,-4) and gives ==0
when not.
CUM(C < Ref(C,-4)) gives the sum of all 1 from the beginning of your
data, since
CUM : SYNTAX cum( ARRAY )
RETURNS ARRAY
FUNCTION Calculates a cumulative sum of the ARRAY from the first
period in the chart
SUM needs a period, since
SUM : SYNTAX sum( ARRAY, periods )
RETURNS ARRAY
FUNCTION Calculates a cumulative sum of the ARRAY for the specified
number of lookback periods (including today).
Example:
CD=SUM(C < Ref(C,-4),30);
will add all 1 occurred the last 30 days.
Take care of Ref(C,4), it looks 4 days forward in the future.
If you want 4 days ago, use only Ref(c,-4).
Hope this help.
Dimitris Tsokakis
--- In amibroker@xxxx, Bernard Bourée <bernard@xxxx> wrote:
> Hello
>
> I'm trying to code some lines in order to find
> how many consecutive bars where closing prices are lower than 4
bars ago.
>
> Should I code CD = SUM(C < Ref(C, 4)
> or CD = CUM(C < Ref(C,-4) ?
>
> Thanks
>
>
> Bernard Bourée
> bernard@xxxx
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