Re: [amibroker] Re: How can AddToComposite generate Null values?

["Tomasz Janeczko" <amibroker@xxxxxx>]

Hello,

In short you can't. 

This is so because AddToComposite by design
is ADDING values. Null values on the other hand are 'special'
and adding null to any non-null value should give null anyway.
This is against composite nature of addtocomposite 
(one null on one symbol would invalidate entire addition).

If you need "fixup" candidates, why don't you make fixup by yourself:

value = ...something

AddToComposite( ValueWhen( DayOfWeek() != 5, value ) , "fixuptest" , "X");

This will give an array that is filled with values defined by you except
of fridays which will held the value from thursday.

Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message ----- 
From: "treliff" <treliff@xxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Monday, January 23, 2006 1:32 AM
Subject: [amibroker] Re: How can AddToComposite generate Null values?


> Thanks Graham, but that doesn't work. When I use 0 (zero) then ATC 
> creates zero value as expected, but I need it to create empty (Null) 
> value.  
> 
> --- In amibroker@xxxxxxxxxxxxxxx, Graham <kavemanperth@xxxx> wrote:
>>
>> use 0 instead of null
>> 
>> 
>> --
>> Cheers
>> Graham
>> AB-Write >< Professional AFL Writing Service
>> Yes, I write AFL code to your requirements
>> http://e-wire.net.au/~eb_kavan/ab_write.htm
>> 
>> 
>> On 1/23/06, treliff <treliff@xxxx> wrote:
>> > When I run a dummy-scan like
>> >
>> > AddToComposite( IIf( DayOfWeek() == 5, Null, 
> 1) , "~nulltest" , "X");
>> >
>> > this results in Friday's values zero (instead of Null or 
> {empty} ).
>> >
>> > Point is I need my ATC to generate values that will be recognized 
> by
>> > Foreign function as "fixup candidates".
>> >
>> > I have tried instead
>> >
>> > AddToComposite( IIf( DayOfWeek() == 5, 1/0, 
> 1) , "~nulltest" , "X");
>> >
>> > and this generates Infiniti values:
>> >
>> > 1.#INF
>> >
>> > however it seems these are not considered for Foreign fixup.
>> >
>> > Any advice will be gratefully received. TIA.
>> >
>> > -treliff
>> >
>> >
>> >
>> >
>> >
>> >
>> > 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 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 other support material please check also:
> http://www.amibroker.com/support.html
> 
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
> 
>


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