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Markus,
What you are wanting to do is actually very involved and difficult to get right. Especially if you plan to handle things like margin, commisions, interest, apply stops, etc. I would suggest trying a smaller project first.
That being said, your current code makes little sense;
You are iterating through the list of open positions such that at each iteration you hold an open position in the 'trade' variable. Yet, you then ignore the trade and instead are asking for an open position for the symbol of 'sig'.
1. What is sig?
2. Why iterate through open trades if you're just going to ignore them?
I suspect that you actually want to use the 'trade' value that you are given from your looping of open positions, in which case you do not need to call FindOpenPos since you already have it.
Also, if you are allowing margin, you will need to take that into consideration. If you use 50% margin, then AmiBroker will take half from cash and half from margin. Thus, you will need to deduct the original margin portion from the value of your open positions.
Mike
--- In amibroker@xxxxxxxxxxxxxxx, "Markus Witzler" <funnybiz@xxx> wrote:
>
> Hi Mike,
>
> do you have a clue for me?
>
> Thanks
>
> Markus
> ----- Original Message -----
> From: Markus Witzler
> To: amibroker@xxxxxxxxxxxxxxx
> Sent: Sunday, November 22, 2009 12:16 PM
> Subject: Re: [amibroker] Re: Computing and plotting historical portfolio metrics in CBT
>
>
> Hello again, Mike!
>
> Nope, I wanted to code my_equity to get a grasp of how CBT actually works.
>
> I´m aware that my_equity is the same as ~~~Equity. I later want to modify my code to test my systems with different versions of my_equity, for instance
>
> my_equity = cash position plus profit of all open positions (locked up by a stop).
>
> I gues Van Tharp calls this "reduced total equity". I want to explore how testing results change if I change the definition of my_equity.
>
> But again, I first need to know where the flaw in my code is. Otherwhise, I have no chance to proceed any further.
>
> Thanks
>
> Markus
>
>
>
>
> ----- Original Message -----
> From: Mike
> To: amibroker@xxxxxxxxxxxxxxx
> Sent: Sunday, November 22, 2009 6:52 AM
> Subject: [amibroker] Re: Computing and plotting historical portfolio metrics in CBT
>
>
>
>
> Markus,
>
> If all you want is a copy of the ~~~Equity that AmiBroker already calculates for you, then there is no need to do any specialized signal/trade handling.
>
> Just do the following:
>
> SetCustombacktestProc("");
>
> if (Status("action") == actionPortfolio) {
> bo = GetBacktesterObject();
> bo.Backtest();
> AddToComposite(Foreign("~~~Equity", "C"), "~my_equity", "X", atcFlagDefaults | atcFlagEnableInPortfolio);
> }
>
> Plot(Foreign("~my_equity", "C"), "My Equity", colorBlue, styleLine);
>
> Mike
>
>
> --- In amibroker@xxxxxxxxxxxxxxx, "Markus Witzler" <funnybiz@> wrote:
> >
> > Hello,
> >
> > I want to compute and plot my own equity (labeled my_equity).
> >
> > In the code below (I skkipped the signal part with buy and sell signal), I wonder why my_equity
> >
> > - is not being shown in backtester report
> >
> > - can´t be plotted
> >
> > - doesn´t show up in exploration
> >
> > Why is that? If you reauire the rest of the code, please let me know
> >
> > Thanks
> >
> > Markus
> >
> > - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> >
> > ...<snip >...
> >
> > for (trade = bo.GetFirstOpenPos(); trade; trade = bo.GetNextOpenPos())
> >
> > {
> >
> > trade = bo.findopenpos (sig.symbol);
> >
> > if (trade)
> >
> > {
> >
> > value_all_open_pos=value_all_open_pos + trade.GetPrice(i, "C") * trade.shares;
> >
> > }
> >
> >
> >
> > }
> >
> > bo.HandleStops(i); // Process programmed stops or applystop at this bar
> >
> > my_equity [i] = bo.cash + value_all_open_pos;
> >
> > } // End of for loop over signals at this bar
> >
> >
> > bo.UpdateStats(i, 1); // Update MAE/MFE stats for bar
> >
> > bo.UpdateStats(i, 2); // Update stats at bar's end
> >
> > } // End of for loop over bars
> >
> > bo.PostProcess(); // Do post-processing
> >
> > AddToComposite(my_equity, "~~~my_equity","x", atcFlagEnableInPortfolio | atcFlagDefaults);
> >
> > }
> >
> > PlotForeign("~~~my_equity", "my_equity", colorRed, styleHistogram );
> >
>
>
>
>
>
> __________ Information from ESET Smart Security, version of virus signature database 4627 (20091121) __________
>
> The message was checked by ESET Smart Security.
>
> http://www.eset.com
>
>
>
> __________ Information from ESET Smart Security, version of virus signature database 4627 (20091121) __________
>
> The message was checked by ESET Smart Security.
>
> http://www.eset.com
>
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