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Calling only once means assign the variable a name i.e. k =
AFLfunction(x,y,z);
Thereafter refer to the value k instead of repeating the
calls in other locations.
Example: instead of
A = C + StdDev(C,n);
B = C - StdDev(C,n);
Use:
S = StdDev(C,n); //call the function once and use below
A = C + S;
B = C - S;
Joseph Biran
____________________________________________
-----Original Message-----
From: amibroker@xxxxxxxxxxxxxxx
[mailto:amibroker@xxxxxxxxxxxxxxx] On Behalf Of js8765
Sent: Sunday, May 11, 2008 3:23 PM
To: amibroker@xxxxxxxxxxxxxxx
Subject: Re: [amibroker] How To Restore Formula Speed?
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 :)
------------------------------------
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