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How do you call a function once using AFL?
If I look at the section "Understanding how AFL works" that is always
quoted whenever anyone has questions about the hard to grasp array
processing language, I can't see anything about how to call a function
once...
Thanks for any help.
P.S. Tomasz, everything is always easy when you know how. What maybe is
a bit more difficult is to put yourself in the position of others who
are still learning and understand that it is not so easy...
Tomasz Janeczko wrote:
> Percentile involves sorting, it is currently implemented
> using absolutely the fastest algorithm known to human kind.
>
> What you can do to speed it up - that's easy - call it once
> and store result.
> This (calling same functions with same arguments many times instead calling it once)
> is the most common mistake people are making.
>
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message -----
> From: Louis Préfontaine
> To: amibroker@xxxxxxxxxxxxxxx
> Sent: Sunday, May 11, 2008 4:15 PM
> Subject: Re: [amibroker] How To Restore Formula Speed?
>
>
> Hi Tomasz,
>
> Is there a way to speed up Percentile function?
>
> Thanks,
>
> Louis
>
>
> 2008/5/11 Tomasz Janeczko <groups@xxxxxxxxxxxxx>:
>
> Hello,
>
> Use
> AFL Editor,
> Tools->Check and Profile
> to find the bottleneck in your code.
>
> Most often people are
> calling the same funciton over and over many times when
> they should call it ONCE and store the result in variable.
> This the most basic improvement can be applied to 99% of
> formulas written and posted here to get a lot more speed.
> The other thing is that you move all array function calls OUTSIDE
> loops. That's second principle: *never* call array function
> inside loop , unless you are doing something like iterating
> through multiple symbols. But NEVER call array funcitons
> inside per-bar loop.
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
>
>
> ----- Original Message -----
> From: "ondrej.uhlarik" <ona@xxxxxxxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Sunday, May 11, 2008 2:44 PM
> Subject: [amibroker] How To Restore Formula Speed?
>
> > Hello,
> > I have programed quite a complicated indicator in AFL. When I load it
> > in a pane it significantly slows down scrolling speed and reaction
> > speed in general. That I find very annoying, so I made a Toggle
> > parameter to switch between 2 modes: Basic (which does not show so much
> > but does not affect speed so much either) and Advanced (which shows
> > everything and affects speed a lot). Now the problem is as follows:
> > I insert the indicator in a pane in the Basic mode and the speed is ok.
> > Then I switch to the Advanced mode and the speed gets worse. Then I
> > switch back to the Basic mode but the speed remains bad, i.e. the
> > original speed is not restored. It seems that the Advanced data are
> > still loaded in some memory cache and affect speed of the indicator
> > even if I switch back to the Basic mode. Is there any chance to clear
> > or reset the data loaded in memory (or whatever) without removing the
> > indicator from the pane and re-inserting it back?
> > Thank you for your ideas, and please keep in mind that I am a beginner
> > in programing :)
> >
> >
>
> > ------------------------------------
>
> >
> > 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 NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> > http://www.amibroker.com/devlog/
> >
> > For other support material please check also:
> > http://www.amibroker.com/support.html
>
> > Yahoo! Groups Links
> >
> >
> >
>
>
>
>
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