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/ Read it CAREFULLY, more than once, analyse the picture showing relationship of visible bars vs barcount and repeat until understood. Best regards, Tomasz Janeczko amibroker.com ----- Original Message ----- From: "Panos Boufardeas" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Saturday, November 29, 2008 1:35 AM Subject: [amibroker] Re: how to improve loop speed > 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 [email protected], "Panos Boufardeas" <[EMAIL PROTECTED]> > 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 [email protected], "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: <[email protected]> >> > 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 >> > >> > >> > >> > >> > >> > > > > ------------------------------------ > > **** IMPORTANT **** > This group is for the discussion between users only. > This is *NOT* technical support channel. > > ********************* > TO GET TECHNICAL 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 > > >
