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Franco,
MS has its PREV because in MS you can not write loops that
iterate through quotes.
In AmiBroker you can - in VBScript or JScript or
DLL.
As for MS formula you quoted it is VERY, VERY unreadable and
if you want me to write
VBScript I need some description of what it should in fact
do.
I don't have time to reverse-engineer MS wrestling with
PREV.
Best regards,Tomasz
Janeczkoamibroker.com
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
Franco Fornari
To: <A title=amibroker@xxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Saturday, September 28, 20027:31
PM
Subject: Re: [amibroker] Re: countback
line
Ken,
as I wrote in my first message, I don't have
forgotten what Tomasz said about PREV and AMA. They are not identical. AMA is
an adaptive moving average, PREV works with other functions allowing them
to refer to themselves.
About AMA, in fact its internal logic makes
inessential any function like PREV, but remains an adaptive moving average,
that's all. Metastock's CBL don't uses any average, it only refers to hard
values, and PREV have to do the same.
Best regards,
Franco
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
Ken Close
To: <A title=amibroker@xxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Saturday, September 28, 2002 6:58
PM
Subject: RE: [amibroker] Re: countback
line
<SPAN
class=480055716-28092002>Franco:
<SPAN
class=480055716-28092002>
Tomasz will
jump in here sometime and say that the AMA or ___? other function in
Amibroker does exactly what PREV does in MS and does it faster. I do not use
it and so do not have it committed to memory. You could search inthe
amibroker yahoo group for PREV or AMA or wait and perhaps Tomasz or someone
else will post a past message on this topic.
<SPAN
class=480055716-28092002>
<SPAN
class=480055716-28092002>Ken
<FONT face=Tahoma
size=2>-----Original Message-----From: Franco Fornari
[mailto:ffpsi@xxxx]Sent: Saturday, September 28, 2002 12:09
PMTo: amibroker@xxxxxxxxxxxxxxxSubject: Re:
[amibroker] Re: countback line
Hello,
yes, I know there isn't in AFL a function
equivalent to PREV. I tried to use a VB Script, but I'm not able
enough. Do you know if there is, somewhere on the WEB, the original Guppy's
formula?
Best regards,
Franco
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
<A title=nenapacwanfr@xxxx
href="">Stephane Carrasset
To: <A
title=amibroker@xxxxxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Saturday, September 28, 2002
4:51 PM
Subject: [amibroker] Re: countback
line
hello,there is not prev function in
Amibrokerprev is a recursive function, BUT you can defind it
with a scripting languagemy choise was since one year was C++but
there is jscript and vbscriptabout the cbl, I think the ms version
is not matching the guppy principles but only an adaptation .this
is not the best trailing stop...steph> > thanksfor
your reply. Maybe you are referring to the dll shared by Stephan.I
know it, but its logic seems rather different and I'd like to match it
against Metastock's CBL.> > Thanks again and best
regards> > Franco> ----- Original Message
----- > From: grant > To:
amibroker@xxxx > Sent: Saturday, September 28, 2002
4:14 PM> Subject: Re: [amibroker] countback
line> > > Franco,
> CBL has been converted
somewhere here before but I can't find it at the moment,
> maybe if you check AB website formular page. I have a
feeling it was also in one > of Steven's DLL's.
Sorry I'm not much help to you but at least you know it's here
> somewhere, I'll keep looking.
>
Grant > Franco Fornari wrote: >
> Hello Tomasz and All, sorry if I propose
the same question again, but I'd need to know if it's possible to
convert from Metastock language to AFL any formula containing PREV
function. Tomasz showed many times, in past, how work AMA and AMA2
but, if I'm not wrong, this case seems different, because in
"Countback line" Metastock formula, PREV doesn't refer to any averages
but to hard values. Is it possible to translate the following formula
to AFL? LowDays := Input("Enter # days to cover last LOW for CBL
calc'n:", 3, 55, 13); > If(LOW >
LLV(LOW, LowDays), {then ...} PREV, {previous CBLlo, else...}
If(Ref(H,-2) > Ref(H,-1) AND Ref(H,-2) > H AND Ref(H,-1) > H,
{then ...} Ref(H,-2), {2nd day back high,else...} If((Ref(H,-3)>
Ref(H,-2) AND Ref(H,-3) > Ref(H,-1) AND Ref(H,-3) > H) AND
(Ref(H,-2)> H OR Ref(H,-1) > H), {then ... } Ref(H,-3), {3rd day
back high,else...} If((Ref(H,-4)> Ref(H,-3) AND Ref(H,-4) >
Ref(H,-2) AND Ref(H,-4) > Ref(H,-1) AND Ref(H,-4) > H) AND
(Ref(H,-3)> H OR Ref(H,-2) > H OR Ref(H,-1) > H), {then... }
Ref(H,-4), {4th day back high,else...} If((Ref(H,-5)> Ref(H,-4) AND
Ref(H,-5) > Ref(H,-3) AND Ref(H,-5) > Ref(H,-2) AND Ref(H,-5)
> Ref(H,-1) AND Ref(H,-5) > H) AND (Ref(H,-4)> H OR Ref(H,-3)
> H OR Ref(H,-2) > H OR Ref(H,-1) > H), {then ...} Ref(H,-5),
{5th day back high,else...} PREV ))))) Any suggestion will be
wellcome. Best regards, Franco > > >
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