Withdrawing+reinvesting profit

Hello,

I just started learning automatic trading and have a question regarding memory management. I understand how much money I can reinvest(by how much I can increase the margin). I also understand how much money I can withdraw. However I don't know how to do when I want to do both at the same time. In the Zorro manual stands the following:



The formulas work fine, except for the last one. I don't understand what the result means/ by how much I can increase the margin.

Example Scenario:
Capital: 3000
Total Profit: 350
Total Withdrawn: 0



As far as I understand, I am now allowed to withdraw up to 179?
Suppose I only want to withdraw 100. By how much can I can increase the margin then? What does the amount under "Available to reinvest" has to do with it?

kind regards,

Alain

In your scenario, "Available to reinvest" is 3170 - 100/sqrt(1+350/3000) = 3075. So you increase your Margin from 3000 to 3075 required capital.

Hmm, but my margin per trade was 50(default avg of Z-systems) not 3000?
3000 was my capital.
So should I increase my margin by 3075/3000 = 1.025
Old margin: 50 -> new margin: 51.25 ?

(Maybe you could add an example scenario for this in the manual too. You have a scenario for reinvesting and one for withdrawing, but none for both)

Almost, but not quite: the relation between margin and capital is not completely linear. So the very precise method would be to move your Margin slider until the backtest shows $3075 required capital. But I think the factor 1.025 is normally good enough.

That makes sense, thanks!

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