Re: [amibroker] Re: Convert Metastock indicator with PREV function into AFL

["Tomasz Janeczko" <groups@xxxxxxxxxxxxx>]

Hello,

No. Ref is NOT the same as PREV.

Prev is usually used for RECURSIVE formulation, therefore LOOP must be used or AMA/AMA2
function

Conversion to loop is pretty straightforward.
1. Create standard loop
2. define temporary variables for PREV "emulation"
3. Re-type the MS line with CC instead of C 
and IIF instead of IF, 

If((C*.97)>PREV,C*.97,If((C*1.03)<PREV,C*1.03,PREV))

to:

result = 0;

for( i = 1; i < BarCount; i++ )
{
  PREV = result[ i - 1 ];
  CC = C[ i ];
  result[ i ] = IIf( (CC*0.97) > PREV, CC*0.97, IIf((CC*1.03) < PREV, CC*1.03, PREV));
}


It is longer than MS code but... advantage is that it runs 100 times faster.

Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message ----- 
From: "gmorlosky" <gmorlosky@xxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Wednesday, May 28, 2008 10:35 PM
Subject: [amibroker] Re: Convert Metastock indicator with PREV function into AFL


> If your mean PREV is the bar one day agao, then replace all PREV with 
> Ref(C,-1)
> 
> --- In amibroker@xxxxxxxxxxxxxxx, "loshude8888" <shublok@xxx> wrote:
>>
>> Dear Members,
>> Plz reply.
>> 
>> Lokesh
>> 
>> 
>> --- In amibroker@xxxxxxxxxxxxxxx, "loshude8888" <shublok@> wrote:
>> >
>> > Dear Members,
>> > 
>> > Following is a METASTOCK indicator, how can we write this 
>> indicator 
>> > into AFL?
>> > 
>> > If((C*.97)>PREV,C*.97,If((C*1.03)<PREV,C*1.03,PREV))
>> > 
>> > Thanks in advance.
>> > 
>> > Regards,
>> > Lokesh
>> >
>>
> 
> 
> 
> ------------------------------------
> 
> 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
> 
> 
> 

------------------------------------

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

<*> 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/