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It seems that your application is different than mine as I do not
store any parameter inside AB database. You can however as you
mention; storing these parameters in a bogus stock symbol however you
only have certain number of fields. If you were to do that then you
can use the same method to calculate any thing you want with the
datas/parameters that you have saved. Only thing you need to do is
to keep track of what you have stored. Good luck
--- 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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