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Hello,
As for variable periods:
Hold, StDev, StdErr, LinRegSlope, CCI could be rewritten
relatively fast.
ADX, MDI, PDI are a little bit more difficult (not from my
point of view
but from the users' point of view - every function that uses
inside
recursive-type of smoothing is prone to some "overshoot"
effect
if the period (or smoothing factor) changes fast instead of
slow.
Zig/Peak/Trough ?
No period here! Do you mean variable percentage ?
If yes this is very bad idea. Why ? Because Zig/Peak/Trough
work
on unequal number of bars and as it constructs the lag it uses
the percentage
to find the swing end. Therefore the percentage has to be
constant
for all swing length. If you change it somewhere the swing
will
represent the percentage only at the swing point (and will not
represent
percentages at other points).
You may experiment with these formulas:
<A
href="">http://www.amibroker.com/library/formula.php?id=242<A
href="">http://www.amibroker.com/library/formula.php?id=241
to find out what happens if variable period is
used.
ValueWhen?
Do you really mean ValueWhen ? It is not period-based! (the
Nth (last param) is not a PERIOD but the occurence
and it does not refer to bars)
By the way: it seems that there is a little demand for
those features.
As far as I remember I got 2 requests (from you and one more
person).
So it will probably need to wait a little (I am currently
adding things requested by *much*
larger group of FT users)
Best regards,Tomasz
Janeczkoamibroker.com
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
CS
To: <A title=amibroker@xxxxxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Wednesday, February 19, 2003 6:23
AM
Subject: Re: [amibroker] Need Help
Excellent.
How about:
ADX
MDI
PDI
LinRegSlope
StdErr
StDev
LinearReg
ValueWhen
Hold
Peak
Trough
Zig
CCI.........
Thanks,
-CS
----- Original Message -----
<BLOCKQUOTE
>
<DIV
>From:
Tomasz Janeczko
To: <A title=amibroker@xxxxxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Tuesday, February 18, 2003 8:45
AM
Subject: Re: [amibroker] Need
Help
Hello,
It is NOT like Metastock.
In fact lots of AFL functions accept variable
periods:
MA,
AMA,
AMA2,
WMA,
TEMA,
DEMA,
Sum,
Ref,
HHV,
HHVBars,
LLV,
LLVBars
These are basic building blocks that allow to code other
indicators that use variable period.
For example dynamic MACD could be coded as
follows:
slowperiod = ..your dynamic period
fastperiod = ..your dynamic period
ff = 2/(fastperiod+1);
sf = 2/(slowperiod+1);
DynMACD = AMA( Close, ff ) - AMA( Close, sf
);
Best regards,Tomasz Janeczkoamibroker.com
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
CS
To: <A
title=amibroker@xxxxxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Tuesday, February 18, 2003 5:27
PM
Subject: Re: [amibroker] Need
Help
Unfortunately, most of the functions within AFL require
a static or constant input parameter for PERIODS. Like
MetaStock.
There are a few, such as MA(ARRAY, PERIODS) which will
allow for a dynamic (changing) Periods parameter.
I suspect that the programming and array memory overhead
is increased, which is why TJ hasn't converted over to dynamic parameter
input.
I have had excellent results using dynamic parameters.
It allows me to create systems that change their own input parameters
mid-stream according to specific market events. Unfortunately, I also
had to drop everything for a few months to learn and translate code into
vb script.
-CS
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
Jim
Hutchison
To: <A
title=amibroker@xxxxxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Tuesday, February 18, 2003
6:35 AM
Subject: RE: [amibroker] Need
Help
Thank you!Could you tell me why this is
needed.Jim Hutchison-----Original Message-----From:
Anthony Faragasso [mailto:ajf1111@xxxxxxxx] Sent: Tuesday, February
18, 2003 9:03 AMTo: <A
href="">amibroker@xxxxxxxxxxxxxxxSubject:
Re: [amibroker] Need HelpJim,After your RS=IIf(Trend ==
1,14,IIf(Trend == 2,7, 4)); statement add
thefollowing:RS=lastvalue(RS);Best
wishesAnthonyPost AmiQuote-related
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