adaptable equity size

[Hawar-Dzaee]

if you set self.buy( size= 1000), it will use 1000 on each trade, how can you use 1 percent of your current equity for each trade?
what I am asking to use (1000*0.01), and let say u it hit your SL and your equity became 990 since ( you only risk 1 percent of 1000, which means you risked 10$. now on the second trade, I want to risk 9.90 which is 1 percent of my current equity, and so on.
how do I do that?

[kernc]

From Order.size docs:

If size is a value between 0 and 1, it is interpreted as a fraction of current available liquidity

So:

# Buy for 1% of equity
self.buy(size=0.01)

[Hawar-Dzaee]

so does that mean I lost $100 on my first trade? if not how can do that?
my tp hit when my profit reaches 1 percent of my current liquidity( that is gaining $100 in this case) and sl hits when it reaches 1 percent loss ( in our case -100$ on current liquidity), and I don't mind how much the entry size is, as long as when it hits my tp I am gaining 1 percent on my current liquidity and losing 1 percent when it hit my sl, I know I can be a bit confusing but is there a way to do that?
I did set specific tp and sl but I want to set that kind of position sizing.
I went through the documentation many times, couldn't figure it out.
this is just a random example.

please if my question isn't clear enough ask for more details, and as always thank you for your time.

[kernc]

You lost $0.13840 on the first trade as it says in the PnL column. In order for 1% SL (or TP) to represent exactly 1% of current equity, just leave size= out, e.g.:

self.buy(sl=0.99*price, tp=1.01*price)

[Hawar-Dzaee]

This is the equation
pipslots10 = equity0.01 (that is to be one percent of the equity)
I want to find out the number of lots to use that if it hits my sl, I lose 1 percent of my current capital.
in this case, its 40 pips and my capital is $10,000 meaning, so the calculation is as follows:-
40(pips)lots(which is the variable) 10 = 10000(my capital) 0.01(the percentage of my capital that I want to risk)
lots = 0.25 lots ( so if i take a position sizing of 0.25

and if hits my tp or sl i would gain or loss $100 dollars of my capital, so for the first row of the PnL column should be (either -100 or +100)
and so on the following trades.

I have already specified conditions for tp and sl

also comes to my mind, how to fix a price after entering a position. because if your tp talib.MAX(x, timeperiod=30) is going to change, how to if I fix this number at the time of entering a position. so if that talib.MAX(x, timeperiod=30) is 1.2345 at the time of entering a position I want to be my tp and not to be changeable until it hits my tp

I've been working on this problem for weeks now :( , I would be very grateful for anykind of help :)

[kernc]

So what you're looking for is:

(entry_price - sl_price) * size == 0.01 * self.equity

Thereafter, it's a simple case of working out the equation to solve for size. See also Strategy.equity.

---

Trade properties .sl and .tp are writable. They are set (to a fixed value) when placing the order, but you can update them on a trade at a later time if you wish.

[Hawar-Dzaee]

seems right, but how do I implement this, and where should do I pass this argument
like this self.buy((entry_price - sl_price) * size == 0.01 * self.equity) ? under next?
are they built-in variables or I should define them?
and if they are built-in and which library should I import, because it's throwing me an undefined error.