|
PureBytes Links
Trading Reference Links
|
This is an excellent explanation and very example.
Thank you very much.
--------------------------------------------------
From: "Thomas Ludwig" <Thomas.Ludwig@xxxxxx>
Sent: Tuesday, June 16, 2009 7:00 PM
To: <amibroker@xxxxxxxxxxxxxxx>
Subject: Re: [amibroker] MetaStock's PREV
> Hello,
>
> TJ once wrote:
>
> [quote]
> Hello,
>
> PREV in MS is needed because MS does NOT have looping.
>
> In AB, there are loop constructs so there is no need for PREV
> because loops give faster and more general way of solving coding problems.
>
> Since loops are more general they allow easy translation of every
> case where MS needs PREV.
>
> Statment like this:
> Z =(A*B)+(C*PREV);
>
> Using loop looks as follows:
>
> z = 0; // initialize
> for( i = 1; i < BarCount; i++ )
> {
> prev = Z[ i - 1 ]; // PREV is previous value of Z.
> Z[ i ] = A[ i ] * B[ i ] + C[ i ] * prev;
> }
>
> As you can see the statement is identical with the exception that
> AFL looping code uses [ ] operator to access individual array elements.
>
> Good thing is that AFL looping code is BarCount-times faster than MS code.
> Since 5 years of EOD data is 1300 bars, AFL looping code is 1300 times
> faster
> than MS in that case.
>
> It is also possible to use AMA/AMA2 instead of PREV:
>
> Z = AMA2( A, B, C );
>
> which is shorter but AMA is less general than looping code.
> [/quote]
>
> HTH
>
> Greetings,
>
> Thomas
>
>
> On 15.06.2009, 13:06:00 Mubashar virk wrote:
>> Hi all,
>>
>> Has any one worked out a universal AFL Function = the perversity in
>> MetaStock that is called PREV.
>>
>> Thanks
>
>
> ------------------------------------
>
> **** IMPORTANT PLEASE READ ****
> This group is for the discussion between users only.
> This is *NOT* technical support channel.
>
> TO GET TECHNICAL SUPPORT send an e-mail directly to
> SUPPORT {at} amibroker.com
>
> TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at
> http://www.amibroker.com/feedback/
> (submissions sent via other channels won't be considered)
>
> For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> http://www.amibroker.com/devlog/
>
> Yahoo! Groups Links
>
>
>
------------------------------------
**** IMPORTANT PLEASE READ ****
This group is for the discussion between users only.
This is *NOT* technical support channel.
TO GET TECHNICAL SUPPORT send an e-mail directly to
SUPPORT {at} amibroker.com
TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at
http://www.amibroker.com/feedback/
(submissions sent via other channels won't be considered)
For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
http://www.amibroker.com/devlog/
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/amibroker/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/amibroker/join
(Yahoo! ID required)
<*> To change settings via email:
mailto:amibroker-digest@xxxxxxxxxxxxxxx
mailto:amibroker-fullfeatured@xxxxxxxxxxxxxxx
<*> To unsubscribe from this group, send an email to:
amibroker-unsubscribe@xxxxxxxxxxxxxxx
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
|