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Hi,
I had a similar problem. Afaik, currently there is no way of forcing
parameter reset. Parameters, with their range, and values are cached.
So if you change a parameter like you did, it will not work. Default values
are cached as well.
My solution is a bit different:
I store required parameter values in parameter files for each security.
These are dafault values that should be used for backtest and live trading.
I have a module that reads these values to variables.
I have parameter statements for all parameters. But the default values are
OUT OF VALUE RANGE. E.g. period parameter should be in range 5 to 25. The
default value is -1 in the parameter statement.
PeriodParam = Param(LabelPeriodParam, -1, 5, 25, 5);
Then a check the value of the param statement. If it is out of range, I use
the value from the file. If it is manually set, I use that value.
If I change security, the values from security file are used (unless manual
setting were done).
So it look like this:
//Determining market hours (entry) and exit time
MarketOpenTimeData = ReadParamValueFile("MarketOpenTime");
MarketOpenTimeParam = ParamTime("*Market open time", "0:00:00",0);
if (MarketOpenTimeParam == 0)
MarketOpenTimeParam = MarketOpenTimeData;
If I hit Reset in param window, default parameter values are set which means
using values from parameter file for the security.
Regards,
Y
--------------------------------------------------
From: "japple_55" <aimria@xxxxxxxxx>
Sent: Tuesday, May 26, 2009 2:24 PM
To: <amibroker@xxxxxxxxxxxxxxx>
Subject: [amibroker] Re: Is it possible to force parameter changes
programatically?
> MurthySuresh,
> Thanks for your idea but...I used the following code (I'm not a programmer
> but think it is correct). The printf statements indicate the cases are
> switching properly but the parameter settings still do not change when I
> change the chart being viewed until I force a "reset all" from the
> parameters window. Any ideas on how to force this reset?
> *************************
> switch (Name())
> {
> case "AHTFX":
> TrailB = Param( "Entry %", 2, 1, 20, 1 )/100;
> TrailS = Param( "Exit %", 2, 1, 20, 1 )/100;
> printf("Parameter changed to 2\n");
> break;
> case "PTTDX":
> TrailB = Param( "Entry %", 3, 1, 20, 1 )/100;
> TrailS = Param( "Exit %", 3, 1, 20, 1 )/100;
> printf("Parameter changed to 3\n");
> break;
> default:
> TrailB = Param( "Entry %", 6, 1, 20, 1 )/100;
> TrailS = Param( "Exit %", 6, 1, 20, 1 )/100;
> printf("Parameter changed to Default 6\n");
> break;
> }
> ***********************************
>
>
>
>
>
> --- In amibroker@xxxxxxxxxxxxxxx, "murthysuresh" <money@xxx> wrote:
>>
>> you cannot use the param in conditional statements. like
>> ParamStr etc
>> what i meant was that you can store the param values in a variable
>> param1, param2....
>> and use the switch statements to chagne the param values in that
>> variable.
>>
>>
>>
>>
>> --- In amibroker@xxxxxxxxxxxxxxx, "japple_55" <aimria@> wrote:
>> >
>> > Did that already but the parameters do not actually change when I
>> > change the symbol in the chart. The Reset button in the parameters
>> > window has to be used to force the change.
>> >
>> >
>> >
>> > --- In amibroker@xxxxxxxxxxxxxxx, "murthysuresh" <money@> wrote:
>> > >
>> > > i dont think so. why dont you just use conditional statements.
>> > > with if(name()=="blah")
>> > > {
>> > > param1=something
>> > > }
>> > >
>> > > or you can use a switch case.
>> > >
>> > > --- In amibroker@xxxxxxxxxxxxxxx, "japple_55" <aimria@> wrote:
>> > > >
>> > > > I have a single system plotted on a chart that I would like to
>> > > > view/test for several symbols, where only the parameters will
>> > > > change according to the symbol being viewed/tested.
>> > > >
>> > > > I've got the parameter changes coded as symbol dependent ("IIF name
>> > > > = ...") and their values reflect properly in the title when I
>> > > > change symbols. But, the system calculations don't update with the
>> > > > new parameters unless I manually reset from the parameters window.
>> > > > Is there a way to force this reset programatically within the AFL
>> > > > code so the changes happen automatically when I change symbols?
>> > > > Thanks,
>> > > > Jim
>> > > >
>> > >
>> >
>>
>
>
>
>
> ------------------------------------
>
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