Problem with SellPrice

[jerdchen]

I have a problem overriding the SellPrice in the AFL code.
I can overwrite the BuyPrice in the AFL code.

I use the following settings:

SetBacktestMode( backtestRegular );
SetOption("InitialEquity", AnfangsKapital); 
SetOption("FuturesMode", False);
SetOption("MaxOpenPositions",MaxPos);
SetOption("AllowPositionShrinking",true);
SetOption("AllowSameBarExit",true);
SetOption("DisableRuinStop", True);
SetOption("CommissionMode",1);
SetOption("CommissionAmount",0.06);
RoundLotSize = 1; 
SetOption("NoDefaultColumns", True );
SetOption("UsePrevBarEquityForPosSizing", False);
SetTradeDelays (0, 0, 0, 0);
BuyPrice = ShortPrice = Open;
SellPrice = CoverPrice = Open;

For example, if I change the code as follows:

BuyPrice = ShortPrice = Open;
SellPrice = CoverPrice = Close;

The open price will continue to be used in the backtest. Even a change in the Automatic Analysis Window does not change the backtest. I don't use ApplyStop...

Using reserved variables "Buyprice", "Sellprice", "Shortprice" and "Coverprice" at market

No, trade prices such as BuyPrice, SellPrice, ... added to AFL code do not always override the ones of Backtest settings - Trades page! There are exceptions that need to be kept in mind. Trade prices of code do not override the ones of backtest/analysis settings dialog if: 1. using SetBacktestMode(backtestRotational) (or old method EnableRotationalTrading() ) The rotational trading mode uses "buy price" and "buy delay" from the Settings | Trade page as trade price and delay for both entries…

I've read many comments in the forum about "SellPrice" but haven't been able to find a solution so far.

It would be great if someone could help me

[beppe]

@jerdchen, I tried your posted code (defining the missing variables) and everything seems to work as expected.

I used the snippet:

BuyPrice = ShortPrice = Open;
SellPrice = CoverPrice = Close;

(adding the EMA crossover trading rules snippet, as provided as an example by Amibroker).

I suggest to double check the results comparing the data with the Quote Editor prices, as I did in the above screenshot.

[peter1]

same here. Code works as expected:

SetBacktestMode( backtestRegular );
SetOption("InitialEquity", 100000); 
SetOption("FuturesMode", False);
SetOption("MaxOpenPositions",1);
SetOption("AllowPositionShrinking",true);
SetOption("AllowSameBarExit",true);
SetOption("DisableRuinStop", True);
SetOption("CommissionMode",1);
SetOption("CommissionAmount",0.06);
RoundLotSize = 1; 
SetOption("NoDefaultColumns", True );
SetOption("UsePrevBarEquityForPosSizing", False);
SetTradeDelays (0, 0, 0, 0);
BuyPrice = ShortPrice = Open;
SellPrice = CoverPrice = c;
Buy = Cross(C,MA(C,50));
Sell = Cross(MA(C,50),C);

[fxshrat]

@jerdchen

I use the following settings:

Why do you guys not follow the forum rules and post complete reproducible code !!!

@Tomasz

One must not forget about absolute basics like:

1. including exact VERSION numbers (don't say "latest" - it means nothing)
2. including minimum, but working reproducible example of the formula that shows the problem that can be copy-pasted and run without modification
3. better yet, in case of Analysis (backtest/exploration/optimization), save entire PROJECT FILE (File->Save As...) into .APX file and attach it so one can just load the project (this includes formula and settings)
4. specifying exactly WHAT DATA you are using (or better yet do the test on Yahoo data, so it is reproducible by anyone, not only person having access to some esoteric data).

In short your post must make it EASY and QUICK for anybody to reproduce the issue you are having without ANY effort. Remember it is you who is asking for help. And it is your task to make it easy to help you.

I repeat:

2. including minimum, but working reproducible example of the formula that shows the problem that can be copy-pasted and run without modification

and

3. better yet, in case of Analysis (backtest/exploration/optimization), save entire PROJECT FILE (File->Save As...) into .APX file and attach it so one can just load the project (this includes formula and settings)

[jerdchen]

I compare with Quote Editor ...

with this Code SellPrice is not Close, is Open ...

BuyPrice = ShortPrice = Open;
SellPrice = CoverPrice = Close;

But i can Change BuyPrice in Afl Code .... Works ....

BuyPrice = ShortPrice = Close;
SellPrice = CoverPrice = Close;

[jerdchen]

The entire code is many, many hundreds of lines long.

I don't think anyone here would bother with that. Maybe someone has a hint why I can override BuyPrice in AFL and not SellPrice.

[fxshrat]

Apparently you don't understand a thing.
It is not about hundreds of lines it is about MINIMUM complete code without missing parts that is reproducible. Shrink your code in such a way that it still shows the issue described. I don't think it is that difficult to understand.

Otherwise follow advice here and solve yourself.

How do I debug my formula?

Continuing the discussion from How do I learn AFL?: Many new users with zero programming experience struggle when their formula works incorrectly. Here are few hints that everyone should use to make finding errors easier. First of all: you have to get insight into what the formula is actually doing, not what you think it does. Typically new user has no idea what is happening inside. Pretty often you make an assumption that things work one way but in fact they work differently. Do not assume t…

[jerdchen]

First of all, I know how to "debug" a code. This code successfully handles sums in the high seven digits. I think it doesn't take too much thought to understand that I don't want to publish this code here.

My one and only question was why I can override BuyPrice and not SellPrice.

I was just asking if someone could give me a hint as to what could be causing this.

It's actually not difficult to understand, is it???? I don't quite understand your rude answer. I'm friendly too, aren't I???

[TrendSurfer]

@jerdchen

First of all, I know how to "debug" a code.

Then go ahead and debug it!

@jerdchen

I think it doesn't take too much thought to understand that I don't want to publish this code here.

That's perfectly fine. However you need to follow forum rules and (as @fxshrat as already advised) post reproducible code. Just replace your 'Secret Source' values with dummy values.

@jerdchen

My one and only question was why I can override BuyPrice and not SellPrice.

You said you know how to debug!

@jerdchen

I was just asking if someone could give me a hint as to what could be causing this.

You have been given the appropriate answer but you don't want to listen.

@jerdchen

It's actually not difficult to understand, is it????

It's yourself who is not understanding.

@jerdchen

I don't quite understand your rude answer.

@fxshrat is not being rude, he is being direct (which is warranted due to your responses).

[jerdchen]

@fxshrat @TrendSurfer @peter1 @beppe

I have to apologize to everyone.
I made the mistake
A really stupid mistake.
So far I have only ever used Open as Enter and Exit and at some point I overwrote the SellPrice in the CBT.

bo.ExitTrade(i, ScaleExit.Symbol, MyTrade.GetPrice(i, "O")); 

So again apologies to all