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Dans un courrier daté du 05/11/98 19:36:22 Heure d7iver Pari22 Madrid,
UWKaestner@xxxxxxxxxxx a écrit :
>
> Actually there is no way to code the simple task ("trade the half size
after
> a
> loss") in Easy Language.
> (Without
> - changing to a shorter time frame,
> - using DLLs,
> - testing all the entry- and exit-conditions to evaluate if the system is
> long,
> short or flat yet and calculate the position profit/-loss,
> - writing data to a file an using it from the system (works only for
> backtesting).
>
> ...and including an other cause of the fault.
>
In fac, tis should be possible, but not by waiting the exit on loss
information that is one bar late ( known at the end of the bar, and available
for the next bar once completed).
One may think a clever solution:
You may know in advance if a position is a winning or losing one, by using
openpositionprofit:
Suppose that you are trading num contracts (Long in this case):
Instead of waiting the reverse signal to adjust the position that is known 1
bar later, you may try this
If openpositionprofit <0 then sell num/2 contract else sell num contracts.
Doing so if position (openpositionprofit <0 )is a potential loser, you reverse
by a num/2 position ( your goal), the other case is a winning position, so you
reverse from the normal num amount.
The drawback with this simple method is that a winning position can tur into a
loser one ( during the completion of the current bar), but it's a minor
disadvantage.
Now, if you use stop orders, you are able to determine if the current positon
will be a real winner or a loser in advance ( more complicated , but feasible,
by using entryprice value [already known] and the stop value [known in
advance]. Also apply to limit orders).
I have not tested it, just directly typed into the Email software, but you
got the idea.
As you may see, TradStation has a lot of possibilities by properly unsing and
understanding the language ( not so easy, I admit)
Sincerely,
Pierre Orphelin
www.sirtrade.com
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