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Graham,
I think you hit it. I had (1000,-1) for this setting. I have a
parameter (nominally set to 500) to limit the number of bars I use to
calculate in realtime (need to use them all of course for
backtesting). I believe that there was some kind of interaction
between the fast AFL and my truncated number of bars. My
calculations take so much time, that I bring my 2GHz core duo to its
knees if I try to do all the bars in my database. I had been
scratching my head for a while wondering why, when I scrolled to the
beginning, the calculations still were being done even though the
database had thousands of bars. I guess fast AFL completely changed
the way I thought I was programming the algorithm. Now it behaves.
When I scroll around, and the plots stay on.
Thanks,
Dennis
On Apr 17, 2007, at 5:44 PM, Graham wrote:
> If you are using loops it is best to add setbarsrequired(10000,10000);
> to your code. This turns off the fastafl in AB which limits the bars
> calculated to just the window. No good for using loops that loop
> through all data.
>
>
>
> --
> Cheers
> Graham
> AB-Write >< Professional AFL Writing Service
> Yes, I write AFL code to your requirements
> http://www.aflwriting.com
>
>
> On 18/04/07, trb0428 <tombrowne34@xxxxxxxxxxx> wrote:
>> Dennis,
>>
>> I once had a similar problem. I had two issues that i fxed that
>> corrected the intermittent plots.
>>
>> 1) Some of the stocks in my database did not have quotes for the
>> entire period that I was trying to calculate in my formulas.
>>
>> 2)I had formula errors. For instance,you need to be sure that there
>> are valid quote values for the range used by all your formulas. For
>> example, if your formula is trying to use a calculated value that
>> does not yet exist( ie. a 20 day moving average value is not
>> available
>> until the 21st day).
>>
>> I found and corrected these types of issues with my code and the
>> intermittent plot problem cleared up. Without knowing your code I
>> can't offer any specific advice. Good luck.
>>
>> Tom
>>
>> --- In amibroker@xxxxxxxxxxxxxxx, Dennis Brown <see3d@xxx> wrote:
>>>
>>> I have an interesting situation that I have lived with for a long
>>> time, but now it is getting in my way.
>>>
>>> I have indicators that I have made that iterate through the bars in
>> a
>>> loop (Ehlers filters). The resulting plots of the data generated
>>> will be visible in the window intermittently. If I adjust the
>> number
>>> of bars viewed or move the display by one bar left or right, it
>> will
>>> cause the indicator plot to appear or be gone. The problem was
>> worse
>>> when I used the built in Avg vs Close, so I had to generate my own
>>> Avg data.
>>>
>>> Before, I just adjusted the display a bit to get my plot visible,
>> but
>>> now I am generating more complex iterations and the problem has
>>> become intolerable.
>>>
>>> Has anyone else run into this problem?
>>>
>>> What caused it and how did you fix it?
>>>
>>> Thanks,
>>>
>>> Dennis
>>>
>
>
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