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Using name() you might be able to store parameters within the AFL.
You might have to use loops but the logic might follow:
If name()==INTC then 'n'=20
If name()==IBM then 'n'=15
MA(C,n)
Interesting problem.
-rlb
--- In amibroker@xxxxxxxxxxxxxxx, "Dave Merrill" <dmerrill@xxxx>
wrote:
> I've wondered about the following:
>
> suppose you store them in an artificial ticker corresponding to
each stock
> you cared about, say SymbolName~Params? each artifical ticker has O-
H-L-C-OI
> fields, which could cover that many parameters. if you needed more
than
> that, you could use additional tickers (~Params_1 etc). they'd be
stored in
> the local db, so AB would manage reading them off disk at the
appropriate
> times, without you coding anything.
>
> you'd have to read the right one, using one of the Foreign
mechanisms, and
> read the right field(s) in spite of their names. if these params
are static
> for the history of each stock, you'd also have to use LastValue or
something
> like that to extend it across all dates.
>
> alternatively, if they're dynamic, you'd need a way to calculate
the full
> history of them (easy), and place the results in a ticker, which I
don't
> know how to do.
>
> haven't tried any of this, just thinking out loud... make any sense?
>
> dave
> This is what I'm trying to do:
>
> -My system requires a different parameter for each stock ie.
> different moving averages, different periods used for calculation
> etc. Currently I have to use the Param function and interactively
> change parameters for each symbol. When I go back to the same
> symbol; I would like to use the previous parameters that I have
set
> to produce the same result I had before. The only way that I
know of
> right now is to write/store these parameters into an external
file in
> the harddrive and read them back when I go back to the same
symbol.
>
> -I am currently running into problem of AB variable definition and
> initialization. I want to have a static kind of variable which
store
> the symbol and use this to conditionally read in the external file
> only a new symbol is read in. I do not have a solution. There
might
> be other alternative which I would like to hear.
>
> -I have successfully implemented read/write to an external file
using
> combination of JScript and AFL. Next is how to conditionally
steer
> the readin or not when the new symbol is entered.
>
> --- In amibroker@xxxxxxxxxxxxxxx, "Dave Merrill" <dmerrill@xxxx>
> wrote:
> > hi, sorry to butt in offering being any help, but I'm
interested in
> how
> > you're creating and reading these external parameter files.
could
> you
> > provide some details?
> >
> > also, when you say you only need to read them when a new symbol
is
> added,
> > that must mean you're putting the data you read somewhere within
> AB's
> > universe, like in a composite maybe, or somewhere else, yes?
> >
> > I've wondered about using the Open Interest field for a custom
> parameter I
> > calculate for each stock. is it possible for AFL code to write
data
> into an
> > existing quote on an existing stock? has anyone done anything
like
> this? I'd
> > love to see some examples.
> >
> > thanks,
> >
> > dave
> > Has anyone tried to write AFL code which will only executed
once
> each
> > time it detects a new symbol just entered? For example:
> >
> > I have external parameter files for each symbol. I only need
to
> read
> > in these parameters once using JScript for each new symbol
> entered.
> >
> > TIA
>
>
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