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Tomasz,
Thanks a lot for the detailed explanation. Now I have a better
handle on this issue.
And I can easily live with this. In fact it will be quite useful.
Just thinking aloud ===> It looks like if I were create a security
with (hypothetical) future values going upto December 31, 2020 and
keep that as 'selected', then I can safely put computed values
in 'real' securities ... and still I can maintain the date of these
not to have to forced as old dates. (This referrs to my question in
the post http://groups.yahoo.com/group/amibroker/message/45946 )
Regards,
- Salil V Gangal
--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <amibroker@xxxx>
wrote:
> Salil,
>
> Synchronization works always. It is actually very easy to check it
> for yourself.
>
> Synchronization works on DATE / TIME BASIS.
>
> So date time of foreign ticker ALWAYS matches currently selected
> symbol.
>
> I don't know how this can be explained clearer.
>
> As for your example:
> Re-read
> http://www.amibroker.com/guide/afl/afl_view.php?name=FOREIGN
>
>
> The last parameter - fixup - with the default value of 1 - causes
filling the holes in the data with previous values (behaviour
> introduced in 3.90.3), if fixup is 0 - the holes are not fixed (the
old, pre-3.90.3 behaviour)
>
> Lets assume that current symbol has data from August 1 to August 15
> while foreigned only from August 1 to August 5.
>
> So if fixup is 1 then Foreigned symbol data will be filled up with
last available data
>
>
> So
> August 1 will REMAIN August 1
> August 2 will REMAIN August 2
> August 3 will REMAIN August 3
> August 4 will REMAIN August 4
>
> August 5 will REMAIN August 5
> August 6 is missing in foreigned data so it will hold 'last
available data' that is from August 5
> August 7 is missing in foreigned data so it will hold 'last
available data' that is from August 5
> August 8 is missing in foreigned data so it will hold 'last
available data' that is from August 5
> August 9 is missing in foreigned data so it will hold 'last
available data' that is from August 5
> .....
>
>
> If FIXUP is zero
> August 1 will REMAIN August 1
> August 2 will REMAIN August 2
> August 3 will REMAIN August 3
> August 4 will REMAIN August 4
>
> August 5 will REMAIN August 5
> August 6 is missing in foreigned data so it will be set to NULL
> August 7 is missing in foreigned data so it will be set to NULL
> August 8 is missing in foreigned data so it will be set to NULL
> August 9 is missing in foreigned data so it will be set to NULL
>
>
> As you can see if there is a MATCHING record for given DATE
> it REMAINS IN PLACE.
> If there is no matchin record the result may be NULL (fixup= 0)
> or the last known value preceding given date.
>
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message -----
> From: "salil_gangal" <salil_gangal@xxxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Thursday, August 14, 2003 1:12 AM
> Subject: [amibroker] Re: How does Date() return the date ?
>
>
> > Tomasz,
> >
> > Hmmm ... alas ... this explanation, I guess actually causes more
> > problems (for what I'm doing) than it solves.
> >
> > What will be the effct of sync when the data for selected
security is
> > more and that of the foreigned securities is less ? So the
selected
> > security is upto August 13th and foreigned is only up August 5th.
> > Will the sync operation shift the data of foreigned security from
5th
> > to 13th, 4th to 12th and so on to match-up with selected
security ?
> > (If so, then that sure is ... err ... I don't know.)
> >
> > Regards,
> > - Salil V Gangal
> >
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko"
<amibroker@xxxx>
> > wrote:
> > > Salil,
> > >
> > > If you read the documentation on FOREIGN
> > > http://www.amibroker.com/guide/afl/afl_view.php?name=FOREIGN
> > >
> > > you would learn that FOREIGN function SYNCHRONIZES all bars /
dates.
> > >
> > > The date of each bar is always given by DateNum() and Foreign
> > symbols
> > > always match current security.
> > >
> > > Best regards,
> > > Tomasz Janeczko
> > > amibroker.com
> > > ----- Original Message -----
> > > From: "salil_gangal" <salil_gangal@xxxx>
> > > To: <amibroker@xxxxxxxxxxxxxxx>
> > > Sent: Thursday, August 14, 2003 12:41 AM
> > > Subject: [amibroker] Re: How does Date() return the date ?
> > >
> > >
> > > > Tomasz,
> > > >
> > > > Hmm ...
> > > >
> > > > That does pose an interesting problem when one is dealing
> > securities
> > > > via Foreign(), as none of the values in Foreign are *actually*
> > > > selected.
> > > >
> > > > So perhaps let me re-state the problem. As before I have 3
> > securities
> > > > with different lengths of data and I'm accessing all of them
with
> > > > Foreign(). What is the way that I can know which data
element is
> > > > associated with which date ? (In other words, LastValue() for
> > first
> > > > security is for date August 5th, for second it is for date
August
> > 8th
> > > > and third it is for date August 13th. How can know these
dates
> > in
> > > > AFL script ?)
> > > >
> > > > Regards,
> > > > - Salil V Gangal
> > > >
> > > >
> > > >
> > > >
> > > > --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko"
> > <amibroker@xxxx>
> > > > wrote:
> > > > > Salil,
> > > > >
> > > > > Date() returns string representing "selected" value of
> > currently
> > > > selected symbol
> > > > > See http://www.amibroker.com/guide/afl/afl_view.php?
> > > > name=SELECTEDVALUE
> > > > >
> > > > > for description of what 'selected' value means.
> > > > >
> > > > > Best regards,
> > > > > Tomasz Janeczko
> > > > > amibroker.com
> > > > > ----- Original Message -----
> > > > > From: "salil_gangal" <salil_gangal@xxxx>
> > > > > To: <amibroker@xxxxxxxxxxxxxxx>
> > > > > Sent: Thursday, August 14, 2003 12:10 AM
> > > > > Subject: [amibroker] How does Date() return the date ?
> > > > >
> > > > >
> > > > > > Friends,
> > > > > >
> > > > > > ( Sure ... sure ... Date() returns a string which contains
> > the
> > > > date
> > > > > > in the particular locale format.) However, my questions
is
> > how
> > > > > > exactly does Date() determine what to return ?
> > > > > >
> > > > > > Say if I have only 3 securities in database, one of them
that
> > has
> > > > > > data from beninning of year thru August 5th, second from
> > > > beginning of
> > > > > > year thru August 8th and third from beginning of year thru
> > August
> > > > > > 13th. Then what is returned by Date() in such a database
and
> > > > why ?
> > > > > >
> > > > > > Regards,
> > > > > > - Salil V Gangal
> > > > > >
> > > > > >
> > > > > >
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