Getting extra data into the CBT can be a challenge. There is a suggestion in the feedback center here:
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amibroker@xxxxxxxxx ps.com, B S <bs2167@xxx> wrote:
>
> Hi-
>
> I asked Marcin a question related to this earlier, but given the considerable interest in the past on this board regarding managing multiple systems, I'd thought put some further thoughts here. My understanding of the conclusion reached during the last round of discussions was that each individual should use low-level CBT to accomplish their multiple systems management goals. So I've done that, but in the end its of no practical use because of the incredible number of static arrays that were required to do it - it 'works' on small samples/tests but the memory demands are too great for things that I'd actually use it for. As my objectives were rather simple, I imagine that
others are still wrestling with similar issues.
>
> As an example, part of my plan was to limit the % of equity that was employed by any one system at a given time. Therefore, while in the backtester I needed to know which system or systems generated the signal. So I started by creating a static array that i could later access in the CBT which contained flags (1,2,4,etc.) indicating which system or systems it came from. However, because of the memory issues, I decided to stuff these flags into the positionsize property and just determine the actual size later while looping through CBT. That allowed me to determine which systems signals were coming from, and then choose which model to allocate the trade to (in the event of multiple simultaneous signals), but I still needed to get the correct entry price. There could be as many entry prices as I have systems, and since I don't know
which I'll be using until I get to the backtester, I needed to store all of them - another static
> array. This process continued like this and then it occurred to me that just about all of these issues would go away if I could just attach the information I needed to the entry signal object. So for example, the user could set PositionSize1, PositionSize2, PositionScore1, PositionScore2, BuyPrice1, BuyPrice2, and so on...or perhaps just dummy variables... Dummy1, Dummy2, etc.. I'm sure there's a memory cost to doing this, but it can't be anything like storing all these static arrays (is this correct? i really have no idea what i'm talking about). Also, I'm sure just making these additional property slots available will come at some performance cost, but perhaps adding them could be an option in settings.
>
> For all I know, editing the number of properties
that can be stored in a signal object is already possible - is it? If not, do others think this would be useful? Is there a better way of achieving the types of things that I'm trying to do?
>
> Appreciate any dialogue whatsoever on this - have spent an embarassing amount of time on it without much to show for it.
>