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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/)
> > > >
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> > > >
> > > > Your use of Yahoo! Groups is subject to
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> > > >
> > > >
> > > >
> >
> >
> > Post AmiQuote-related messages ONLY to: amiquote@xxxxxxxxxxxxxxx
> > (Web page: http://groups.yahoo.com/group/amiquote/messages/)
> >
> > Check group FAQ at:
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> >
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> >
> >
> >
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