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Keith, did this work for you? I love your suggestion of
MaxBuys = 3;
SetOption("MaxBuys", MaxBuys);
Maybe, TJ would implement it in the next release that is coming out
tomorrow (LOL).
--- In amibroker@xxxxxxxxxxxxxxx, "Edward Pottasch" <empottasch@xxx>
wrote:
>
> hi,
>
> yes I forgot to remove that line. I usually open a file and write
output to that file to see what is going on.
>
> you open like:
>
> fh = fopen("c:\\loopTest.txt", "w" );
>
> then you can write stuff to this file like:
>
> if( fh ) fputs( "s long: " + cntLongOpen + "\n", fh );
> if( fh ) fputs( "s short: " + cntShortOpen + "\n", fh );
>
> and at the end you close this file like:
>
> fclose( fh );
>
> rgds, Ed
>
>
>
> ----- Original Message -----
> From: Keith McCombs
> To: amibroker@xxxxxxxxxxxxxxx
> Sent: Thursday, March 22, 2007 2:57 AM
> Subject: Re: [amibroker] MaxBuys per bar in backtesting
>
>
> Edward --
> Thanks for your response. I will give it a try. Though it will
probably take me a while. I've been trying to get my brain around
the Custom Backtester, and it has been slow going for me.
>
> BTW, I notice that you end your code with fclose( fh ); I don't
see it mentioned in either "Portfolio Backtester Interface Reference
Guide" or "How to add user-defined metrics to backtest/optimization
report". Is that something you discovered was necessary or
just "good practice" or for some other reason? Where was 'fh'
defined?
> -- Keith
>
> Edward Pottasch wrote:
>
>
> i believe you are supposed to do this with the custom
backtester. I never managed to use this on any useful level but maybe
this code will get you ahead. It looks at all bars and finds the
signals for each bar and removes excess signals before the signals
are processed. I did not include a ranking of the signals though ..
(see http://www.amibroker.com/guide/a_custombacktest.html for
details .... ).
>
>
> SetCustomBacktestProc("");
>
> MaxBuys = 3;
>
> if( Status("action") == actionPortfolio ) {
>
> bo = GetBacktesterObject();
> bo.PreProcess();
>
> for( i = 0; i < BarCount; i++ ) {
>
>
> cntBuys = 0;
>
> // look at new signals and exclude signals if they exceed
maxBuys
> for( sig = bo.GetFirstSignal(i); sig; sig =
bo.GetNextSignal(i) ) {
>
> // check for entry signal and long signal
> if( sig.IsEntry() ) {
>
> if( cntBuys > MaxBuys ) {
>
> sig.PosSize = 0;
>
> } else {
>
> cntBuys = cntBuys + 1;
>
>
> }
>
>
> }
>
>
> }
>
> bo.ProcessTradeSignals( i );
> }
>
> bo.PostProcess();
>
> fclose( fh );
> }
>
>
>
>
>
> ----- Original Message -----
> From: Keith McCombs
> To: amibroker@xxxxxxxxxxxxxxx
> Sent: Tuesday, March 20, 2007 8:12 PM
> Subject: [amibroker] MaxBuys per bar in backtesting
>
>
> I would like to set a maximum buys per bar.
>
> I know about:
> MaxOpen = 10;
> SetOption("MaxOpenPositions", MaxOpen);
>
> But is there any way to write the 'equivalent' of:
> MaxBuys = 3;
> SetOption("MaxBuys", MaxBuys);
>
> TIA.
> -- Keith
>
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