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No, NO NO!
You should NEVER EVER be doing ANY extra stuff like that because AmiBroker
does that FOR YOU AUTOMATICALLY by means of QuickAFL.
It uses visible bars automatically.
Read THIS:
http://www.amibroker.com/kb/2008/07/03/quickafl/
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "Mike" <sfclimbers@xxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Saturday, November 29, 2008 6:39 AM
Subject: [amibroker] Re: how to improve loop speed
> Hi,
>
> Is this what you are looking for?
>
> firstVisibleBar = Status("FirstVisibleBar");
> lastVisibleBar = Status("LastVisibleBar");
>
> for (bar = firstVisibleBar; bar <= lastVisibleBar; bar++) {
> // Your code here...
> }
>
> Mike
>
> --- In amibroker@xxxxxxxxxxxxxxx, "Panos Boufardeas" <panosbouf@xxx>
> wrote:
>>
>> Hi
>> Today I was playing without fully understanding what I was doing
> and
>> I believe I made a break through.
>> Any way what I found is if I use
>> for(i = 0; i < BarCount; i++ )
>> the results are 3446 data bars used during this check. Total
>> execution time was 0.0228476 sec.
>>
>> and If I use
>> for(i=BarCount-1;i>1 AND Status("firstvisiblebar");i--)
>> The results are 3446 data bars used during this check. Total
>> execution time: 0.00249557 sec.
>>
>> so the second loop looks faster.
>> I would like to ask one more time what can I write to use just the
>> visible bars? Is this possible? I am trying to find a way to speed
> up
>> the loops in codes that require them ,and to count just the visible
>> bars or as less as possible.
>>
>> Thank you
>> Panos
>>
>> --- In amibroker@xxxxxxxxxxxxxxx, "Panos Boufardeas" <panosbouf@>
>> wrote:
>> >
>> > Thank you Tomasz
>> >
>> > So what I can see from your reply, this example here is correct.
>> > But must be a way for a loop to calculate only the last X bars,
> and
>> > not all of theme
>> >
>> > Thank you
>> > Panos
>> >
>> > --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@>
>> > wrote:
>> > >
>> > > Hello,
>> > >
>> > > Move ALL array functions OUTSIDE of loop!
>> > >
>> > > Inside the loop there should be only NON-array functions.
>> > >
>> > >
>> > > // THIS MUST BE OUTSIDE THE LOOP !!!!!!
>> > >
>> > > Q=Param( "% Change",1.50,.25,14 ,0.25);
>> > >
>> > > Z= Zig(C,q ) ;
>> > >
>> > > HH=((Z<Ref(Z,- 1) AND Ref(Z,-1) > Ref(Z,-2)) AND (Peak(z,q,1 )
>> > >
>> > > >Peak(Z,q,2 )));
>> > >
>> > > LL=((Z>Ref(Z,- 1) AND Ref(Z,-1) < Ref(Z,-2)) AND (Trough
> (Z,q,1 )
>> > <Trough(Z,q,2 )));
>> > >
>> > >
>> > > dist = 0.5*ATR (20);
>> > >
>> > >
>> > > for( i = 0; i < BarCount; i++ )
>> > > {
>> > >
>> > > // ONLY THIS should be inside the loop
>> > > if( HH [i]) PlotText( "HH"+ "\n"+H[ i ], i, H[ i ]+dist[i],
>> > colorGreen );
>> > > if( LL [i] ) PlotText( ""+L[ i ]+"\nLL", i, L[ i ]-dist[i],
>> > colorRed );
>> > > }
>> > >
>> > > Nothing more is needed.
>> > >
>> > > Best regards,
>> > > Tomasz Janeczko
>> > > amibroker.com
>> > > ----- Original Message -----
>> > > From: "Panos Boufardeas" <panosbouf@>
>> > > To: <amibroker@xxxxxxxxxxxxxxx>
>> > > Sent: Thursday, November 27, 2008 6:45 PM
>> > > Subject: [amibroker] how to improve loop speed
>> > >
>> > >
>> > >
>> > >
>> > > Hi
>> > >
>> > > I am curious to find out how to make a loop to run from
>> > firstvisiblebar
>> > >
>> > >
>> > > I think I need to write something like the following . but I
>> don't
>> > know how
>> > >
>> > >
>> > > lvb = Status("lastvisiblebar");
>> > >
>> > > fvb = Status("firstvisiblebar");
>> > >
>> > >
>> > > for( i = 0; i < ??? ; i++ )
>> > >
>> > > {
>> > >
>> > >
>> > > I have an example here that executes very slowly in live intra
>> day
>> > chart
>> > >
>> > > Can you tell me please how I can correct this example ?
>> > >
>> > >
>> > > Q=Param( "% Change",1.50,.25,14 ,0.25);
>> > >
>> > > Z= Zig(C,q ) ;
>> > >
>> > > HH=((Z<Ref(Z,- 1) AND Ref(Z,-1) >
>> > >
>> > > Ref(Z,-2)) AND (Peak(z,q,1 )
>> > >
>> > > >Peak(Z,q,2 )));
>> > >
>> > > LL=((Z>Ref(Z,- 1) AND Ref(Z,-1) < Ref(Z,-2)) AND (Trough(Z,q,1 )
>> > >
>> > > <Trough(Z,q,2 )));
>> > >
>> > >
>> > > dist = 0.5*ATR (20);
>> > >
>> > >
>> > > for( i = 0; i < BarCount; i++ )
>> > >
>> > > {
>> > >
>> > > if( HH [i]) PlotText( "HH"+ "\n"+H[ i ], i, H[ i
>> > >
>> > > ]+dist[i], colorGreen );
>> > >
>> > > if( LL [i] ) PlotText( ""+L[ i ]+"\nLL", i, L[ i
>> > >
>> > > ]-dist[i], colorRed );
>> > >
>> > > }
>> > >
>> > >
>> > > Plot(C,"",IIf(C>O,colorGreen,colorRed),styleCandle);
>> > >
>> > >
>> > > Thank you
>> > >
>> > > Panos
>> > >
>> > >
>> > >
>> > >
>> > >
>> >
>>
>
>
>
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