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As are most of the functions in ABTool. There's not a whole lot of
diff between loading a one dimensional array in AB/AFL and loading a
multidimensional array or table in ABTool. Is there really ? Is
that the kind of thing we're classifying as black box ?!
PS I can't tell you how many emails it actually took me some number
of months ago to get TJ to actually add that description to DEMA.
--- In amibroker@xxxxxxxxxxxxxxx, Nigel Rowe <rho@xxxx> wrote:
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> Given that Tomasz *HAS* documented (see
> http://www.amibroker.com/guide/afl/afl_view.php?name=DEMA)
> DEMA(c,20) as being equivelant to
>
> Len = 20;
> Factor = 2/(Len+1);
>
> e1 = AMA( Close, Factor );
> e2 = AMA( e1, Factor );
> Plot( DEMA( Close, Len ), "Built-in DEMA", colorRed );
> Plot( 2*e1 - e2, "AMA-implemened DEMA", colorBlue );
>
> 5 minutes with google, I find
> http://www.tradestationworld.com/EL_library/studies/tema.shtm, and
a few
> minutes more with AB, gives
>
> Len = 20;
> Factor = 2/(Len+1);
>
> e1 = AMA( Close, Factor );
> e2 = AMA( e1, Factor );
> e3 = AMA( e2, Factor );
> Plot( TEMA( Close, Len ), "Built-in TEMA", colorRed );
> Plot( 3*e1 - 3*e2 + e3, "AMA-implemened TEMA", colorBlue );
>
> Not a very Black box.
>
> I think you will find that most of the functions that Tomasz has
put in
> AmiBroker are standard ones from the trading literature (eg TA S&C).
>
> Nigel
>
>
> On Thu, 10 Jul 2003 03:06 pm, Fred wrote:
> > Steve,
> >
> > To some degree this is nonsense when it comes to the functions of
> > ABTool. Unless you have looked at all the C++ code that Tomasz
has
> > written the indicators therein are to a large extent as much of
black
> > box as the functions in ABTool. Do you know what TEMA does ? or
half
> > the other things in the list ?
> >
>
>
> - --
> Nigel Rowe
> rho@xxxx
>
>
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