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If you are using AddToComposite to create your
index's, you use the Foreign() function to access it.
----- Original Message -----
Sent: Saturday, November 26, 2005 11:41
AM
Subject: [amibroker] Re: How to refer to
a custom formula in a system test?
Dan, I appreciate the effort, and if that crossover
indicator was all
I needed I'm sure it would work as you say.
Thank-you, and I'll
store away the idea for the
future.:)
Unfortunately, what I really need is access to the values of
the
custom index I created, as if it was another ticker symbol. In
fact,
I want to create a few more custom indices, representing different
stock portfolios.
In case I've been unclear about what I'm doing
and why, I want to be
able to run a portfolio-level system test where I
refer to the
portfolio equity in a "sell" rule, i.e., "sell the entire
portfolio
if the equity falls by -%5 from its peak." My thinking was
that if I
could re-create the portfolio as an index OUTSIDE of the system
test
and refer to it using "FOREIGN" I could avoid coding that was over my
head, and circular
references.
Luck,
Sebastian
--- In
amibroker@xxxxxxxxxxxxxxx, "Dan Clark" <dan_public@xxxx>
wrote:
>
> Sebastian,
>
>
>
>
Hi. A simple function might do the trick. Below is a
function
that I
> created that you can try out. Copy this into
a text file and save
it as
> some good sounding file name. For
example, "CrossHHV.afl". Save
it to the
>
"..\AmiBroker\Formulas\Systems\" folder. Contents of CrossHHV.afl
(before
> using include file) should look like:
>
>
>
> function CrossHHV()
>
> {
>
> RetValue =
Cross(Ref(HHV(C, 20), -1)*.95, C);
>
>
>
> return RetValue;
>
>
}
>
>
>
> Sell = CrossHHV();
>
>
Filter = Sell;
>
>
>
> AddColumn(HHV(C, 20),
"HHV(H, 20)", 1.2);
>
> AddColumn(Ref(HHV(C, 20), -1),
"Ref(HHV(H, 20), -1)", 1.2);
>
> AddColumn(Ref(HHV(C, 20),
-1)*.95, "Ref(HHV(H, 20), -1)*.95", 1.2);
>
>
>
>
>
> Open up the AA window, Pick "CrossHHV.afl", and click
"Explore".
You will
> see all symbols that meet that
criteria.
>
>
>
> Assuming that works, try
using an include file. An include file is
nothing
> more than
an AFL file that contains custom functions and procedures
that you
>
create. Typically, you store it in the folder
>
"..\AmiBroker\Formulas\Include\". To use the functions, you would
add to
> chart or exploration\backtest code: "#include" + file
name. For
example, if
> your include file was named,
"ABFunctions.afl, you would add this
to your
> charts, explorations,
etc:
>
>
>
>
#include <ABFunctions.afl>;
>
>
>
>
So, create a file called "ABFunctions.afl" in the
>
"..\AmiBroker\Formulas\Include\" folder. Now, move ONLY the
CrossHHV
> function code ONLY to the "ABFunctions.afl" file.
The contents of
the
> "ABFunctions.afl" file should look like:
>
>
>
> function CrossHHV()
>
> {
>
> RetValue =
Cross(Ref(HHV(C, 20), -1)*.95, C);
>
>
>
> return RetValue;
>
>
}
>
>
>
> Now make sure that the CrossHHV.afl
file has been modified. It
should look
> like this
(after using the include file):
>
> #include
<ABFunctions.afl>;
>
>
>
> Sell =
CrossHHV();
>
> Filter = Sell;
>
>
>
> AddColumn(HHV(C, 20), "HHV(H, 20)", 1.2);
>
>
AddColumn(Ref(HHV(C, 20), -1), "Ref(HHV(H, 20), -1)", 1.2);
>
>
AddColumn(Ref(HHV(C, 20), -1)*.95, "Ref(HHV(H, 20), -1)*.95", 1.2);
>
>
>
> Now, when you execute the CrossHHV.afl file,
the code in the
ABFunctions.afl
> will be "included" in the
CrossHHV.afl and you can execute the
function.
> This is a
convenient way of reusing code.
>
>
>
> I
hope this helps.
>
>
>
> Regards,
>
>
>
> Dan.
>
> _____
>
> From: amibroker@xxxxxxxxxxxxxxx
[mailto:amibroker@xxxxxxxxxxxxxxx]
On Behalf
> Of
sebastiandanconia
> Sent: Friday, November 25, 2005 2:59 PM
> To:
amibroker@xxxxxxxxxxxxxxx
> Subject: [amibroker] Re: How to refer to a
custom formula in a
system test?
>
>
>
>
Dan, I'm not sufficiently knowledgeable about this to know the
>
difference between a coded function and a complete indicator, LOL!
>
> In the custom indicator/index I created, I want to be able to refer
> to it in a system-test just as I would with RSI(), MACD(),EMA(),
> etc. As a specific example, I'd like to know when the current
index
> value sells off by 5% from its 20-day HHV, referring to it
along
the
> line of this:
>
> Sell=Cross(Ref(HHV("My
Custom Index",20),-1)*.95,"My Custom Index");
>
> I didn't use
AddtoComposite because I didn't think it would give me
> the weighting
method I wanted (equal dollar amounts in each
security
> instead of
simply adding the stock price of each security). (Maybe
> I've
got that wrong, too?)
>
> I don't really "get" #include yet (like
anyone else, some concepts
> come easy and some come hard). Is
#include what I should
concentrate
> on to get what I want, do you
think?
>
>
> Luck,
>
> Sebastian
>
>
> --- In amibroker@xxxxxxxxxxxxxxx, "Dan Clark"
<dan_public@xxxx>
wrote:
> >
> >
Sebastian,
> >
> >
> >
> > When
you said ".when I created a custom indicator, I could refer
to
> it
and
> > use it.", are you referring to a coded function or a complete
> indicator
> > (like an MA)?
> >
> >
> >
> > If the former, you can create
functions and add them to an
include
> file.
> > Then you
would use "#Include" with the file name in a chart of
> >
scan/exploration. For example, if you stored your functions in
> the file
> > "ABFunctions.afl", this is text you would add
to the top of your
> chart AFL
> > to refer to the
indicator:
> >
> >
> >
> >
#include <ABFunctions.afl>
> >
> >
>
>
> > If to the latter, you can create an indicator, save it to
an AFL
> text file
> > and then add it to a chart.
Typically, these custom indicator
> files are
> > saved to
".\Amibroker\Formulas\Custom\". They would then appear
> in
the
> > "Charts\Custom" list ("View --> Charts").
> >
> >
> >
> > Regards,
> >
>
>
> >
> > Dan.
> >
> >
> >
> >
> >
> >
>
>
> > _____
> >
> > From:
amibroker@xxxxxxxxxxxxxxx
[mailto:amibroker@xxxxxxxxxxxxxxx]
> On
Behalf
> > Of sebastiandanconia
> > Sent: Friday, November
25, 2005 10:44 AM
> > To: amibroker@xxxxxxxxxxxxxxx
> >
Subject: [amibroker] How to refer to a custom formula in a system
>
test?
> >
> >
> >
> > I created
the index referred to in this post:
> >
> > http://finance.groups.yahoo.com/group/amibroker/message/90273
>
>
> > ...as a custom indicator so that I could refer to it in a
system
> > test. (AddtoComposite couldn't get me where I
wanted to go.) In
my
> > old Metastock software, when I created
a custom indicator I could
> > simply refer to it and use it, but I
haven't found a way to do
this
> > with Amibroker. I did a
search on the Amibroker.com discussion
> boards
> > site and
there have been inquiries about this, but with no
answers.
> >
> > Does this capability exist, or if not, is there a relatively
easy
> > workaround? TIA.
> >
>
>
> > Luck to all,
> >
> > Sebastian
>
>
> >
> >
> >
> >
> >
> >
> > Please note that this group is for discussion
between users only.
> >
> > To get support from AmiBroker
please send an e-mail directly to
> > SUPPORT {at}
amibroker.com
> >
> > For other support material please
check also:
> > http://www.amibroker.com/support.html
>
>
> >
> >
> >
> >
> >
> > _____
> >
> > YAHOO!
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> >
> >
> >
> >
* Visit your group "amibroker
> >
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> >
> >
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> > amibroker-unsubscribe@xxxxxxxxxxxxxxx
> >
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> >
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> > <http://docs.yahoo.com/info/terms/>
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> >
> >
> >
>
> _____
> >
>
>
>
>
>
>
> Please note that this group is for discussion
between users only.
>
> To get support from AmiBroker please send
an e-mail directly to
> SUPPORT {at} amibroker.com
>
> For
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