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Franco,
As it was mentioned on this list there is some doubt ifMS
formula really represents the original,
so I encourage you to go to <A
href="">www.google.com and do some
searching.
Please do a web search it is really useful. I remember someone
asking me for linear regression
not too long ago. I typed "linear regression" in the Google
and in 3 top results I found
very reasonable references.
It is easy, quick and does not hurt.
When you find some nice description - I will write the
formula.
Best regards,Tomasz Janeczkoamibroker.com
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
Franco Fornari
To: <A title=amibroker@xxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Saturday, September 28, 20028:22
PM
Subject: Re: [amibroker] Re: countback
line
Tomasz,
thanks for your kind reply. I'll try to re-write
the formula in a more readable form and I'll send to you. If you will have a
spare moment, I will be happy, but if you have to spend too much time, never
mind, it's not a matter of life and death.
Thanks in advance and best regards,
Franco
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
Tomasz Janeczko
To: <A title=amibroker@xxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Saturday, September 28, 2002 8:00
PM
Subject: Re: [amibroker] Re: countback
line
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@xxxxxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Saturday, September 28, 2002
7:31 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 internallogic
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@xxxxxxxxxxxxxxx
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 in the 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@xxxxxx
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> > thanks for 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, September28,
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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