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Thank you Bruce, your idea can lead to some interesting alternatives.
I will certainly try this. I am considering creating an artificial ticker, with the number of bars I need, instead of using an existing one.
best regards,
herman
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Wednesday, April 30, 2008, 3:12:23 PM, you wrote:
> Herman -
> First, I agree, the new status functions look wonderful and will allow
> some interesting app's.
> In reference to your note about cloning data, I've tried lobbying TJ
> at conferences for 2 years to add this to the Settings. He
> acknowledges the gain, so maybe someday soon. Fred and I and probably
> others clone symbols to a specified date minus 252 bars to allow long
> lookback functions to stabilize. This data truncation has a PROFOUND
> impact on execution times. Depending on the amount of AFL code, and
> if you only need a couple years of history, speedups of 3x+ are not
> uncommon. Very important to optimizations.
> There is another way, though, and that is why I thought I'd write a
> quick note. If this method was available through COM automation, I
> would have used it instead of cloning because the overhead is minimal
> and the benefits are almost as great.
> Go into settings and set "Pad and align...", and set the reference
> symbol to a ticker that covers the desired date range minus a number
> of bars for functions to stabilize. For example, if you were using
> the QP3 database, you might set it to IEZ, which started in 5/5/2006
> to get a 1 year history minus 1 year of bars for stabilization. You
> will get a significant speedup.
> Plus it is simpler than an export/import. Just remember to "un-set"
> it when it isn't needed.
> Bruce R.
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