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Tomasz,
Thanks, there is so much help documentation that I sometimes cannot
find the right reference areas and then it can be hard for me
to "connect the dots" to tie together what I pick up in one area with
what I find in another. Sooner or later, it will all come together
for me.
Bill
--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <amibroker@xxxx>
wrote:
> Bill,
>
> If you lookup the AFL reference
(http://www.amibroker.com/guide/afl )
> you will see that
>
> 1. BarIndex() returns the sequential bar number
> 2. EndValue and BeginValue are universal functions that
> allow you to lookup values of the array at the BEGINNING and
> the END points of range.
>
> 3. WriteVal is really needed only in commentaries. It just converts
> the number to string, since only strings (texts) can be outputted
in commentary window.
>
> But... In AA window you don't need to use WriteVal at all.
>
> For example in exploration mode you just write
>
> // display only results for last bar of range
> Filter = BarIndex() == EndValue( BarIndex() );
>
> Period = EndValue( BarIndex() ) - BeginValue( BarIndex() );
>
> AddColumn( StDev( Close, Period ), "StDev" );
> AddColumn( ROC( Close, Period ), "ROC" );
> AddColumn( MA( Volume, Period ), "Average Volume" );
>
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message -----
> From: <wbarack@xxxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Sunday, February 16, 2003 7:19 PM
> Subject: [amibroker] Re: Number of Days between dates
>
>
> > Tomasz,
> >
> > So the thought sequence I need to go through is something like
this:
> >
> > 1. What AFL variable defines the quantity I'm interested in -
> > BarIndex().
> > 2. What value of that variable do I want - EndValue().
> > 3. What do I want to do with that value - WriteVal().
> >
> > I've go a lot to learn to get my mind wrapped around AFL and the
> > language structure.
> >
> > Thank you for your patience with me.
> >
> > Bill
> >
> >
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko"
<amibroker@xxxx>
> > wrote:
> > > Bill,
> > >
> > > One WriteVal() and some braces were missing, corrected one
follows:
> > >
> > > Period = EndValue( BarIndex() ) - BeginValue( BarIndex() )+1;
> > >
> > > PerChange = WriteVal(100*(EndValue(Close)-BeginValue
> > > (Close))/BeginValue(Close));
> > >
> > > Title ="Percentage change of close is " +
> > > PerChange +
> > > "%, \nStandard Deviation over the period is " +
> > > WriteVal( EndValue( StDev( Close, Period ) ) );
> > >
> > > BTW: I don't think you need to add +1 to the Period.
> > >
> > > Best regards,
> > > Tomasz Janeczko
> > > amibroker.com
> > > ----- Original Message -----
> > > From: <wbarack@xxxx>
> > > To: <amibroker@xxxxxxxxxxxxxxx>
> > > Sent: Sunday, February 16, 2003 6:53 PM
> > > Subject: [amibroker] Re: Number of Days between dates
> > >
> > >
> > > > Tomasz,
> > > >
> > > > Well, it didn't take long until I ran into my next roadblock.
> > Here is
> > > > the code:
> > > > -----------
> > > > Period = EndValue( BarIndex() ) - BeginValue( BarIndex() )+1;
> > > >
> > > > PerChange = WriteVal(100*(EndValue(Close)-BeginValue
> > > > (Close))/BeginValue(Close));
> > > >
> > > > Title ="Percentagechange of close is " + PerChange + "%,
> > \nStandard
> > > > Deviation over the period is "+ EndValue( StDev( Close,
> > Period ) ) ;
> > > >
> > > > ----------------
> > > > When I apply it, I get an error indication at the last
semicolon
> > in
> > > > the Title statement.
> > > >
> > > > Now, another question and this is based on an interpretation
of
> > the
> > > > Period calculation in line 1. Is the appropriate value to use
the
> > > > difference between the bar indexes or the difference plus 1
to
> > use
> > > > all the bars in the range. It seems to me that the
appropriate on
> > > > depends on how the barindex function is constructed.
> > > >
> > > > Thanks
> > > >
> > > > Bill
> > > > --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko"
> > <amibroker@xxxx>
> > > > wrote:
> > > > > Hello,
> > > > >
> > > > > I have added the sample codes to:
> > > > >
> > > > > http://www.amibroker.com/guide/afl/afl_view.php?
name=BEGINVALUE
> > > > >
> > > > > and
> > > > >
> > > > > http://www.amibroker.com/guide/afl/afl_view.php?
name=ENDVALUE
> > > > >
> > > > >
> > > > > Best regards,
> > > > > Tomasz Janeczko
> > > > > amibroker.com
> > > > > ----- Original Message -----
> > > > > From: <wbarack@xxxx>
> > > > > To: <amibroker@xxxxxxxxxxxxxxx>
> > > > > Sent: Sunday, February 16, 2003 5:28 PM
> > > > > Subject: [amibroker] Number of Days between dates
> > > > >
> > > > >
> > > > > > I am trying out 4.29.1 and its wonderful new functions
that
> > let
> > > > me
> > > > > > select a from-to range on a price plot. Thanks Tomasz.
Great
> > > > addition.
> > > > > >
> > > > > > What I want to do is calculate a standard deviation over
the
> > > > selected
> > > > > > range. While the example for "percentage change" in price
> > that is
> > > > > > included withe download works great, the standard
deviation
> > > > function,
> > > > > > like many others, wants to know the period to be calcated
> > over.
> > > > > >
> > > > > > StDev(array, period);
> > > > > >
> > > > > > So I am trying to find the period as follows:
> > > > > >
> > > > > > Range (or period) = EndValue(Datetime())-BeginValues
(DateTime
> > ());
> > > > > >
> > > > > > however, this expression and the variants of it that I
have
> > tried
> > > > > > results in error messages when I try to write the value
of
> > StDev
> > > > in a
> > > > > > Title expression.
> > > > > >
> > > > > > I'm sure I messing up formats or something similar and I
> > cannot
> > > > find
> > > > > > the Help descriptions that will get me out of my dilema.
> > > > > >
> > > > > > Long winded, but the basic question is: "How do I find
the
> > range
> > > > > > in "bars" for a given From-to range such that I can use
it in
> > > > > > functions like StDev?"
> > > > > >
> > > > > > Second associated question: "How do I direct the Title
> > function
> > > > to
> > > > > > execute a carriage return?"
> > > > > >
> > > > > > Thanks
> > > > > >
> > > > > > Bill
> > > > > >
> > > > > >
> > > > > > Post AmiQuote-related messages ONLY to:
> > amiquote@xxxxxxxxxxxxxxx
> > > > > > (Web page:
http://groups.yahoo.com/group/amiquote/messages/)
> > > > > >
> > > > > > Check group FAQ at:
> > > > http://groups.yahoo.com/group/amibroker/files/groupfaq.html
> > > > > >
> > > > > > Your use of Yahoo! Groups is subject to
> > > > http://docs.yahoo.com/info/terms/
> > > > > >
> > > > > >
> > > > > >
> > > >
> > > >
> > > > Post AmiQuote-related messages ONLY to:
amiquote@xxxxxxxxxxxxxxx
> > > > (Web page: http://groups.yahoo.com/group/amiquote/messages/)
> > > >
> > > > Check group FAQ at:
> > http://groups.yahoo.com/group/amibroker/files/groupfaq.html
> > > >
> > > > Your use of Yahoo! Groups is subject to
> > http://docs.yahoo.com/info/terms/
> > > >
> > > >
> > > >
> >
> >
> > Post AmiQuote-related messages ONLY to: amiquote@xxxxxxxxxxxxxxx
> > (Web page: http://groups.yahoo.com/group/amiquote/messages/)
> >
> > Check group FAQ at:
http://groups.yahoo.com/group/amibroker/files/groupfaq.html
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >
> >
Post AmiQuote-related messages ONLY to: amiquote@xxxxxxxxxxxxxxx
(Web page: http://groups.yahoo.com/group/amiquote/messages/)
Check group FAQ at: http://groups.yahoo.com/group/amibroker/files/groupfaq.html
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
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