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I have used static vars to make a "pseudo array".
This is used in a utility to:
1. read an arbitrary user selected watchlist.
Note: stocks are called out of a watch list by a number 0 to n-1
watchlist members.
2. compute a ranking indicator value for each day and for each stock
in the WL.
3. store this array in a static variable whose name is (SVar + WL
stock number). For example a static var name could be SVar13 for the
14th stock in the watchlist.
4. Plot each WL stock and Static Var containing the ranking values
5. For any given day, sort the SVarNN list to find the highest ranked
stocks.
6. Print out the sorted list in the Interpretation window in
descending order - highest first, then on down.
This is all done with several static variables of the form SVName + NN
where SVName is some arbitrary name, and NN is the location of the
stock in the list.
So it turns out that even if there is no Array[nnn] for static
variables you can effectively do an array with appending the array
name on to the numerical array location.
ReefBreak
--- In amibroker@xxxxxxxxxxxxxxx, "Ara Kaloustian" <ara1@xxx> wrote:
>
> I am using ATCs to transport arrays from one program to another.
>
> Example:
> I generate all my indicators withind my trading program, but display
them in
> other panes below the price chart.
>
> I do not recompute any indicators. Simply save them in an ATC in the
main
> program and read the ATC in the display frogram and display indicators.
>
> It seems pretty efficient.
>
> ----- Original Message -----
> From: "Barry Scarborough" <razzbarry@xxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Wednesday, December 03, 2008 6:53 AM
> Subject: [amibroker] Re: AFL coding
>
>
> > Sorry for the confusion.
> >
> > I wish static vars could contain arrays too. Ain't so.
> >
> > What I was saying is that if you have an indicator that calculates a
> > CCI then you may be able to get the current value using a static. If
> > the program that uses the staticvarget you could add this to an
> > array. I am assuming you are using live data and pass the data every
> > scan. This will not work for back test or anything like that. I will
> > try this later and see if it is true. If so then I will post how I
> > did it.
> >
> > If I understood the original post, where the user wanted to use
> > multiple charts and then combine the output of each indicator chart
> > into a buy signal in the auto trading program. To do this the signal
> > could be generated in an indicator and the buy condition could be
> > passed in a static. That could be ANDed in the Buy = whatever in the
> > trading program. But to preserve this condition in the auto trading
> > program it would have to be assigned to an array if the user wanted
> > to plot the CCI results.
> >
> > This is no problem at all if you use includes. I explained, or I
> > tried to explain, how to use includes to accomplish this. I wouldn't
> > touch a DLL with a stick.
> >
> > Barry
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, Dennis Brown <see3d@> wrote:
> >>
> >> Barry,
> >>
> >> I am having a tough time following this.
> >> Are you saying that a single static variable can hold an array?
> >> I only wish it were true.
> >> You can do it with static variables, but you have to have a
> > separate
> >> variable for each element in the array.
> >>
> >> AddToComposite() or disk files are the only way I know to pass an
> >> array between AFL charts/panes, and it can be very slow.
> >> It is faster to recalculate.
> >>
> >> I guess one could write a DLL that could save them like a static
> >> variable.
> >> This has been discussed at length in the past.
> >>
> >> BR,
> >> Dennis
> >>
> >> On Dec 3, 2008, at 1:54 AM, Barry Scarborough wrote:
> >>
> >> >
> >> > I forgot to say how to use the static var. In the using program
> > you
> >> > set the static var to a local variable.
> >> >
> >> > Before you can do that you need to create Pfx in this module.
> >> > Pfx = "CCI";
> >> > Then set a local var
> >> > fCCI = StaticVarGet(Pfx + "CCI");
> >> > And now you have the value from the other indicator in your local
> >> > program.
> >> >
> >> > If you are going to do much of this create an include with
> > constants
> >> > in it and include that before all other includes and in every
> >> > indicator where it will be used. Hey, now you are doing object
> >> > oriented coding in AFL, neat huh. Well kinda but not really but
> > this
> >> > will save you loads of time when building other systems.
> >> >
> >> > As I mentioned before I think includes are the way to go but
> >> > programming is an art form and everyone has their own style. What
> >> > works for you is the right way to go. But as much as you can look
> > far
> >> > ahead.
> >> >
> >> > Cheers,
> >> > Barry
> >> >
> >> > --- In amibroker@xxxxxxxxxxxxxxx, "Barry Scarborough" <razzbarry@>
> >> > wrote:
> >> >>
> >> >> That is a nice idea.
> >> >>
> >> >> Make sure the static variables are unique, don't collide. It
> > would
> >> > be
> >> >> safest to use a prefix for each indicator you create. An example
> >> > for
> >> >> a CCI indicator would be
> >> >> Pfx = "CCI";
> >> >> fCCI = do your CCI calc here
> >> >> StaticVarSet(Pfx + "CCI", fCCI);
> >> >> This static var is visible to all other programs running on the
> >> >> visible chart.
> >> >>
> >> >> Also I think that AB scans the charts from top to bottom so make
> >> > sure
> >> >> the auto trading code is at the bottom so the data delivered to
> > it
> >> > is
> >> >> fresh and not from the last scan. You can trace this and see what
> >> >> happens.
> >> >>
> >> >> But, I think you are going to run into problems when you try to
> >> > back
> >> >> test or optimize since AA only sees the formula you are back
> >> > testing.
> >> >> It will not see the other charts on a worksheet.
> >> >>
> >> >> Another thing you can do is create an include file for each of
> > the
> >> >> indicators you want to use. Include them in the auto trading
> >> > program
> >> >> and also in the indicators you use in the other charts but don't
> >> > plot
> >> >> them in the auto trading program. Put the parameters in the
> >> > indicator
> >> >> file not your auto trading file. Set the default parameter in the
> >> >> include and all charts will stay in sync. If you add arrows at
> > the
> >> >> buy points in each indicator you will see when they are
> >> > contributing
> >> >> to the trade condition.
> >> >>
> >> >> This is an example I use in my AT program:
> >> >>
> >> >> // cci include
> >> >>
> >> >> pCCI = Param("CCI period", pCCI, 1, 20, 1);
> >
> >> >> pCCI = Optimize("CCI period", pCCI, 1, 20,
> > 2);
> >> >>
> >> >> fCCI = CCI(pCCI);
> >> >> CCIlo = fCCI < -100;
> >> >> CCIhi = fCCI > 100;
> >> >> CCIup = fCCI > Ref(fCCI, -1);
> >> >> CCIdn = fCCI < Ref(fCCI, -1);
> >> >>
> >> >> if(PlotTrue)
> >> >> Plot(fCCI, "\nCCI(" + NumToStr(pCCI, 1.0) + ")",
> > colorGreen,
> >> >> styleOwnScale);
> >> >>
> >> >> Note that I have the default parameter set to the var name pCCI.
> >> > When
> >> >> I include it I set the value before the #include line. You don't
> >> > have
> >> >> to do this but it is one way to use the same include formula in
> >> > many
> >> >> programs but override the parameter in the using program(s). Then
> >> > you
> >> >> can set PlotTrue = True; before the #include to tell the
> > indicator
> >> >> whether to plot it or not. If would be false in your AT program
> > and
> >> >> true in your indicator.
> >> >>
> >> >> Barry
> >> >>
> >> >> --- In amibroker@xxxxxxxxxxxxxxx, "Mike" <sfclimbers@> wrote:
> >> >>>
> >> >>> You could try using StaticVarSet in your main pane. Then, refer
> >> > to
> >> >> the
> >> >>> values using StaticVarGet in the sub panes. You might have to
> > use
> >> >> the
> >> >>> View | Refresh All menu item to get the other panes to update
> >> > after
> >> >>> making any changes in the main pane, else activate each one in
> >> > turn
> >> >> to
> >> >>> have them update automatically upon activation.
> >> >>>
> >> >>> Mike
> >> >>>
> >> >>> --- In amibroker@xxxxxxxxxxxxxxx, "brianw468" <wild21@> wrote:
> >> >>>>
> >> >>>> Can anyone help with the following, please:-
> >> >>>> 1. I am developing an AFL to generate buy and sell signals by
> >> >> combining
> >> >>>> different indicators with variable parameters (to be
> >> > optimised).
> >> >> I
> >> >>>> would like to generate a plot with price and one indicator in
> >> > the
> >> >> top
> >> >>>> pane, and the other indicators in separate panes below this, to
> >> >> reduce
> >> >>>> clutter in the plots.
> >> >>>> I know I could simply set up separate panes with the
> >> > appropriate
> >> >>>> indicators - BUT then the parameters would not be tied to those
> >> >> used in
> >> >>>> the main pane. Changing parameter values and ensuring
> >> > consistency
> >> >>>> across the panes would then become a chore.
> >> >>>> 2. I had thought that the SECTION commands might help here, but
> >> >> that
> >> >>>> doesn't seem to be the case. In fact, on checking the
> >> >> documentation I
> >> >>>> can't find when it is either necessary or desirable to use
> >> > these
> >> >>>> commands. Does anyone know?
> >> >>>> TIA
> >> >>>>
> >> >>>> Brian
> >> >>>>
> >> >>>
> >> >>
> >> >
> >> >
> >> >
> >> > ------------------------------------
> >> >
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> >>
> >
> >
> >
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**** IMPORTANT ****
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*********************
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*********************
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