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Hello,
As I mentioned in the other post of mine there are
TWO INDEPENDENT areas:
1. Make input data array available for functions like RSI
2. Make second argument (period) accept array too (variable period).
Somehow people mix those 2 areas.
Fred speaks that he wants all functions to cover at least
area (1).
The posts of Mark refer to area (2).
Let me show you example:
RSI( period ) - this function has no input data array (uses CLOSE array
indirectly) and accepts static period
(1) RSIa( ARRAY, period ) - this function accepts input data array but accepts
only static period
(2) RSIa( ARRAY, dynamic_period ) - this function accepts input data array
and accepts both static and dynamic_period.
(NOTE: Current version of AB does NOT support this RSIa 'flavour' yet)
As to (1): implementation of this is relatively easy.
There is one caveat however: many analytical functions
in fact use MORE than one input array. For example Stochastics use
Close, Open and High arrays as inputs.
ATR too needs OHLC, not only close.
As to (2): not every function is suitable for this kind of operation. Although
theoretically it is possible to rewrite every function to accept such 'variable
periods' the practice shows that transformations that are recurrent in nature
(exponential averages for example) are extremely 'sensitive' if parameter(s)
change to fast. A kind of "frequency modulation" effect appears that may produce
distortions therefore one should be careful working with adaptive systems
using recurrency-based transformations.
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: <uenal.mutlu@xxxxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Friday, April 18, 2003 5:28 PM
Subject: Re: [amibroker] Dynamic Indicators Poll -- VOTE AGAIN, PLEASE
> And IMHO also
> LINEARREG, LINREGSLOPE, TSF
> should be removed from your list. Please
> check the remaining too... Test it in AFL editor (it will inform you
> via a small hint window about the params after you type the opening brace).
> UM
>
> ----- Original Message -----
> From: <uenal.mutlu@xxxxxxxxxxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Friday, April 18, 2003 5:21 PM
> Subject: Re: [amibroker] Dynamic Indicators Poll -- VOTE AGAIN, PLEASE
>
>
> > Hi mark,
> > can you clarify BBANDBOT and BBANDTOP;
> > IMHO they both already do accept user defined arguments
> > for all the 3 possible parameters to them.
> > UM
> >
> >
> > ----- Original Message -----
> > From: "markf2" <feierstein@xxxxxxxxx>
> > To: <amibroker@xxxxxxxxxxxxxxx>
> > Sent: Friday, April 18, 2003 4:03 PM
> > Subject: [amibroker] Dynamic Indicators Poll -- VOTE AGAIN, PLEASE
> >
> >
> > > In Message 38132, Tomasz pointed out that HHV, LLV, HHVBars, LLVBars,
> > > DEMA, TEMA, MA, WMA, REF, and SUM already work with dynamic
> > > parameters. When I updated the poll to reflect this, ALL votes were
> > > lost so please vote again if you're still interested, LOL.
> > >
> > > http://groups.yahoo.com/group/amibroker/surveys?id=1071266
> > >
> > > I apologize for the confusion. The fact that the above indicators and
> > > functions accept dynamic parameters was reflected in release notes but
> > > not in the 4.30 users guide that I used to make the poll. The fact
> > > that so many of you voted for them shows you didn't know either, and
> > > I've asked Tomasz to include this information in the next
> > > documentation update.
> > >
> > > Mark
> > >
> > > "No good deed goes unpunished."
> > > --Steve Karnish
>
>
>
>
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>
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