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Steve,
"Latch" in AmiBroker is built-in function called Flip
http://www.amibroker.com/f?flip
tr = Flip( entry, exit );
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "steve_roweau" <affrica@xxxxxxxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Friday, September 30, 2005 11:17 AM
Subject: [amibroker] Re: Bitten the bullet on loops
>I use something that I learnt (in the old days with MS) called a
> latch that
> can be useful. I tend to avoid loops if there is another way;
>
> // Entry & Exit criteria
> entry = Entryconditions...;
> exit = ExitConditions...;
>
> // Roy Larsen's latch
> I = Cum(entry + exit > -1)==1;
> tr = BarsSince( I OR entry) < BarsSince(I OR exit);
>
> // Target set when buy triggered
> targetloss = ValueWhen( Cross(tr, 0.5), Loss, 1);
> targetProfit = ValueWhen( Cross( tr, 0.5), profit, 1);
>
> Buy = entry AND Ref(tr, -1) == 0;
> Sell = exit OR ((C > targetprofit OR C < targetloss) AND Ref(tr, -1))
> ;
>
> In the above code there are a few variables that need to be specified
> (ie
> Loss, Profit etc) but it does work to set these targets without
> loops. My
> translation from MS is probably a bit rough but it does the job for
> me.
>
> Steve
>
> --- In amibroker@xxxxxxxxxxxxxxx, "Charles Stangor"
> <cstangor232@xxxx>
> wrote:
>> Graham.
>>
>> I think your last comment about loops makes some sense to me and is
> in
> fact
>> exactly the issue I have been working on. Sometimes you need
> variable x
> to
>> define variable y, but you can't define x until you define y !!
>>
>> For instance:
>>
>> Buy = Buycond and NumberofPriorBuys < 3;
>> NumberofPriorBuys = sum(buy, barssince(daystart));
>>
>> But how can I use a loop to solve this mess?
>>
>> Thanks in advance...
>> ----- Original Message -----
>> From: "Graham" <kavemanperth@xxxx>
>> To: <amibroker@xxxxxxxxxxxxxxx>
>> Sent: Thursday, September 29, 2005 7:23 PM
>> Subject: Re: [amibroker] Bitten the bullet on loops
>>
>>
>> > Loops are best used when you need to refer to a previous value of
> a
>> > variable in calculating the current value of that same variable.
>> > There are other cases where loops are preferable, but I first try
>> > "normal" AFL functions and methods first. If at first they don't
>> > succeed get loopy
>> >
>> > --
>> > Cheers
>> > Graham
>> > AB-Write >< Professional AFL Writing Service
>> > Yes, I write AFL code to your requirements
>> > http://e-wire.net.au/~eb_kavan/ab_write.htm
>> >
>> >
>> > On 9/30/05, Charles Stangor <cstangor232@xxxx> wrote:
>> >> Are you guys writing loops because you just can't do what you
> want
> using
>> >> the
>> >> regular ++ code? I'm getting convinced it's the way to go.
> Thanks
> for
>> >> the
>> >> great code.
>> >
>> >
>> >
>> > Please note that this group is for discussion between users only.
>> >
>> > To get support from AmiBroker please send an e-mail directly to
>> > SUPPORT {at} amibroker.com
>> >
>> > For other support material please check also:
>> > http://www.amibroker.com/support.html
>> >
>> >
>> > Yahoo! Groups Links
>> >
>> >
>> >
>> >
>> >
>> >
>
>
>
>
>
> Please note that this group is for discussion between users only.
>
> To get support from AmiBroker please send an e-mail directly to
> SUPPORT {at} amibroker.com
>
> For other support material please check also:
> http://www.amibroker.com/support.html
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
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