[amibroker] Re: If(C<PREV,StLong,Max(StLong,PREV));

["Thomas Ludwig" <Thomas.Ludwig@xxxxxx>]

--- In amibroker@xxxxxxxxxxxxxxx, "Herman van den Bergen" 
<psytek@xxxx> wrote:
> This comes up a million times and is a constant frustration for ex-
MS users;
> the collective number of hours lost on this by new-comers must be 
in the
> thousands.
> 
> Can somebody write an MS-type Prev() in afl and add it to the afl 
library?

Herman,

I don't think that's possible. According to the Metastock Formula 
Primer "PREV is a special value that refers to the current formulas' 
value for the previous period". The AFL translation below covers only 
the AMA-type case. IMHO there are other cases where this translation 
doesn't fit.

Greetings, Thomas

> 
> // PREV
> Z =(A*B)+(C*PREV);
> 
> can be written in AFL as:
> 
> Z = AMA2( A(array), B, C );
> 
> also:
> 
> xx = FactorA * Close + (FactorB * PREV(xx)); // metastock
> 
> translates to:
> 
> xx = AMA2( Close, FactorA, FactorB );
> 
> best regards,
> herman.
> 
>   -----Original Message-----
>   From: gunovanengel [mailto:gunovanengel@x...]
>   Sent: Monday, April 04, 2005 3:11 AM
>   To: amibroker@xxxxxxxxxxxxxxx
>   Subject: [amibroker] If(C<PREV,StLong,Max(StLong,PREV));
> 
> 
> 
>   How do I change this to AmiBroker code
> 
>   Thanks
>   Guno
> 
>   If(C<PREV,StLong,Max(StLong,PREV));
> 
> 
> 
> 
> 
>   Please note that this group is for discussion between users only.
> 
>   To get support from AmiBroker please send an e-mail directly to
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> 
> 
> 
> 
> 
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