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Ken,
Marek has added his
http://www.amibroker.com/library/formula.php?id=138
since 2001-12-20
His code could work with periods=Param(...
Dimitris
--- In amibroker@xxxxxxxxxxxxxxx, "Ken Close" <closeks@xxxx> wrote:
> I pulled the Aroon indicator, written by Tomasz, from the library.
> While you can see it in its entirety there, let me reproduce one
part of
> it in order to ask my question.
>
> Here is the indicator (one half of it), AroonUp:
>
> H14 = HHV( High, 14 );
>
> AroonUp =
> 100 * ( 14 - ( ( IIf(Ref(H ,-1) == H14 ,1 ,
> IIf(Ref(H ,-2 ) == H14 ,2,
> IIf(Ref(H ,-3 ) == H14 ,3,
> IIf(Ref(H ,-4 ) == H14 ,4 ,
> IIf(Ref(H ,-5 ) == H14 ,5 ,
> IIf(Ref(H ,-6 ) == H14 ,6 ,
> IIf(Ref(H ,-7 ) == H14 ,7 ,
> IIf(Ref(H ,-8 ) == H14 ,8 ,
> IIf(Ref(H ,-9 ) == H14 ,9 ,
> IIf(Ref(H ,-10 ) == H14 ,10 ,
> IIf(Ref(H ,-11 ) == H14 ,11 ,
> IIf(Ref(H ,-12 ) == H14 ,12 ,
> IIf(Ref(H ,-13) == H14 ,13 ,
> IIf(Ref(H ,-14 ) == H14 ,14 ,0 ) ) ) ) ) )
> ) ) ) ) ) ) ) ) ) ) ) / 14;
>
> Now, putting in a Parameter statement for the HHV length of 14 is
> obviously meaningless because the ArronUp statement has 14 IIf
> comparisons.
>
> My question for those loop writers who are more experienced than me
is
> this: how do you construct a loop structure which increase the
> comparison sections as the lookback period increases or decreases
the
> comparison sections as the lookback period decreases.
>
> Tomasz wrote this Aroon structure in the days (2001) before
Amibroker
> had loops and functions etc. So how could it be written today in
order
> to easily change the lookback period without massive changes to the
IIf
> comparisons?
>
> I hope the question is clear; if not, ask and I will attempt another
> explanation.
>
> Any ideas?
>
> Thanks,
>
> Ken
>
> PS: I have looked at this indicator before (outside of Amibroker)
but
> was stimulated by a recent article in the Ensign Newsletter that has
> this to say about using the Aroon indicator. BTW, a parameter
screen
> from the article showed a 6 period lookback which is what got me
> thinking about how to change the AB Aroon indicator.
>
> Ah, the text is too long to put in here. Better, if you are
interested,
> is to go to the following address where you can read all of the
Ensign
> Newsletters, which sometimes contain useful info apart from the
Ensign
> program.
>
> http://www.ensignsoftware.com/tips/newsletter.htm
>
> The Aroon discussion is in the Sept Newsletter, the second section
about
> half way down the page.
>
>
> ---
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