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Hello Richard and Dimitris,
Sorry to have caused so much confusion.
Since most stocks since 2000 have been trending down, you may get a
only a few bars because the P&F Chart ignores small up moves and only
extends down bars when the price moves more than the box size. Since
2000, you may very well have only a few bars. Try loading more data
for at least one stock.
I used AmiQuote and Yahoo for the data. I have data from January
1994. The AmiBroker version on which I created this file is 4.0.0
Apr 26 2002.
I do not know if the AmiBroker version is causing the difference. I
saw that it worked for Richard on MSFT (although I am not sure what
the whole MSFT v. MSFT issue was - it seems to have resolved
itself). Perhaps Richard also has more data loaded.
As you can see from the script, it is very simple. If problems
continue, I would be happy to go through it in detail to see if there
is a coding error.
I'm afraid I have no other explanation other than more data. Let's
try that first.
Mirat
PS I would post .gifs of my charts but I do not know how to attach a
file to my reply. Although that would not help resolve the issue. :-)
--- In amibroker@xxxx, "Richard Alford" <richard.alford@xxxx> wrote:
> I am just isolating variables. If we have the same program and
version (4.06.1 Jun 19 build), the same indicator code (this I
confirmed) and same data we should get the same result. (I continue
to believe in deterministic computing - probably naive in light of
Microsoft!). The questionable variable, and a big one, is the data
source - I use qp2. Perhaps someone using yahoo could compare to
your results?
>
>
> It does appear that the "box size", the significant change that
defines an X or O in my understanding, should be normalized to the
price of the instrument to account for the difference in WCOME
pricing vs. DJIA, for example. I am referring to the code fragment:
>
> // Calculate PF Chart Box size and minimum Reverse values
> // Box = ((tot[i]/(i+1))^.5)/7.3374;
>
> Cheers,
>
> Richard
> ----- Original Message -----
> From: dtsokakis
> To: amibroker@xxxx
> Sent: Wednesday, July 17, 2002 2:49 PM
> Subject: [amibroker] Re: Point & Figure Chart in AFL
>
>
> Richard,
> YHOO via Amiquote.
> Why do you think it is a matter of data provider ?
> Dimitris Tsokakis
>
> --- In amibroker@xxxx, "Richard Alford" <richard.alford@xxxx>
wrote:
> > but the point remains that you and I get different results.
what
> is your data source?
> >
> > Richard
> > ----- Original Message -----
> > From: dtsokakis
> > To: amibroker@xxxx
> > Sent: Wednesday, July 17, 2002 1:47 PM
> > Subject: [amibroker] Re: Point & Figure Chart in AFL
> >
> >
> > Richard,
> > ANY other function works just fine with my valuable Amibroker
> 4.06.
> > Just fine.
> > I can not see the reason for this P&F script.
> > Anyway, the author perhaps could expain.
> > Dimitris Tsokakis
> >
> > --- In amibroker@xxxx, "Richard Alford" <richard.alford@xxxx>
> wrote:
> > > DT, I agree it was not easy to understand. The attached
charts
> > showed the TWO results that were generated whenever I entered
the
> > symbol MSFT - it appears to be a fluke and I cannot reproduce
it
> any
> > longer. Although there is not ticker name in the formula,
there
> was
> > strange behavior occurring for MSFT and MSFT only at that
time.
> > >
> > > The gist of my reply to you was that using the SAME code as
you
> > posted and using the code I copied from the files sections, I
> > generated the same results - and not the results that you
were
> > creating. That suggests that you have a problem in your data
> and/or
> > setup. The only reason for the two codes was to guarantee
that
> there
> > wasn't a subtle error - there was not.
> > >
> > > Sorry for adding the confusion about the MSFT fluke at the
same
> > time.
> > >
> > > Cheers,
> > >
> > > Richard
> > > ----- Original Message -----
> > > From: dtsokakis
> > > To: amibroker@xxxx
> > > Sent: Wednesday, July 17, 2002 12:47 AM
> > > Subject: [amibroker] Re: Point & Figure Chart in AFL
> > >
> > >
> > > Richard,
> > > It is not easy to understand this
> > > "the plot for MSFT changes when one changes the symbol go
> MSFT
> > from
> > > MSFT??? "
> > > I copied the formula from
> > > http://groups.yahoo.com/group/amibroker/files/Point-Figure
> > > pasted in my Ind. builder and get the posted gifs.
> > > No ticker name is into the formula.
> > > What is "the two MSFT " ???
> > > Do you use the same code from the above address??
> > > DT
> > >
> > >
> > > --- In amibroker@xxxx, "Richard Alford"
<richard.alford@xxxx>
> > wrote:
> > > > Those are not the figures I generate using the code in
> > the "files
> > > section". (Why wasn't this put in the AFL library is a
> question
> > in
> > > my mind???)
> > > >
> > > > Just noticed that the plot for MSFT changes when one
> changes
> > the
> > > symbol go MSFT from MSFT??? Not the case for AMZN or
ORCL?
> > > >
> > > > I attached the two MSFT for comparison, one is "my"
copy,
> and
> > the
> > > other is a copy and paste of the code in your note. The
> > difference
> > > is the quirk in MSFT, not an error in the code you have
used.
> And
> > DT
> > > do you really like black on blue borders? Personally, I
can
> > never
> > > read your chart titles.
> > > >
> > > > Cheers,
> > > >
> > > > Richard
> > > >
> > > >
> > > > ----- Original Message -----
> > > > From: Dimitris Tsokakis
> > > > To: amibroker@xxxx
> > > > Sent: Tuesday, July 16, 2002 1:14 PM
> > > > Subject: [amibroker] Re: Point & Figure Chart in AFL
> > > >
> > > >
> > > > Mirat,
> > > > Here is P&F charts for AMZN, MSFT and ORCL.
> > > > Data since Jan 2000.
> > > > Is it the expected picture ?
> > > > The code, copied from files section
> > > >
> > > > // PF Chart by Mirat Dave
> > > > // Copy and paste this as a custom indicator.
> > > >
> > > > EnableScript("jscript");
> > > > <%
> > > >
> > > > High = VBArray( AFL( "High" ) ).toArray();
> > > > Low = VBArray( AFL( "Low" ) ).toArray();
> > > >
> > > > // Calculate running average stock price for use in
> > calculating
> > > the Box size.
> > > >
> > > > tot = new Array();
> > > > tot[0] = (High[0] + Low[0])/2;
> > > > for( i=1; i < High.length; i++ )
> > > > {
> > > > tot[i] = tot[i-1] + ((High[i] + Low[i])/2);
> > > > }
> > > > PFO = new Array();
> > > > PFC = new Array();
> > > >
> > > > // initialize first element
> > > >
> > > > j = 0;
> > > > PFO[j] = High[0];
> > > > PFC[j] = Low[0];
> > > > down = 1; // By default the first bar is a down bar.
> > > >
> > > > up = 0;
> > > > swap = 0;
> > > >
> > > > // perform the loop that produces PF Chart
> > > >
> > > > for( i = 1; i < High.length; i++ )
> > > > {
> > > > // Calculate PF Chart Box size and minimum Reverse
values
> > > >
> > > > Box = ((tot[i]/(i+1))^.5)/7.3374;
> > > > Reverse = Box * 3;
> > > > if( Low[i] < PFC[j] - Box && down)
> > > > {
> > > > PFC[j] = Low[i];
> > > > }
> > > > else
> > > > {
> > > > if( High[i] >= PFC[j] + Reverse && down)
> > > > {
> > > > j++;
> > > > swap = 1;
> > > > PFO[j] = Low[i];
> > > > PFC[j] = High[i];
> > > > }
> > > > }
> > > > if( High[i] > PFC[j] + Box && up)
> > > > {
> > > > PFC[j] = High[i];
> > > > }
> > > > else
> > > > {
> > > > if( Low[i] <= PFC[j] - Reverse && up)
> > > > {
> > > > j++;
> > > > PFC[j] = Low[i];
> > > > PFO[j] = High[i];
> > > > swap = 1;
> > > > }
> > > > }
> > > > if( swap )
> > > > {
> > > > swap = 0;
> > > > if( up )
> > > > {
> > > > up = 0;
> > > > down = 1;
> > > > }
> > > > else
> > > > {
> > > > up = 1;
> > > > down = 0;
> > > > }
> > > > }
> > > > }
> > > >
> > > > // Shift chart to the right to eliminate trailing
empty
> data
> > > > // - PF charts are generally smaller/shorter then the
> full
> > stock
> > > charts because they lack a time scale.
> > > >
> > > > delta = High.length - PFO.length;
> > > > for( i = High.length; i > delta; i-- )
> > > > {
> > > > PFO[ i-1 ] = PFO[ i-delta-1];
> > > > PFC[ i-1 ] = PFC[ i-delta-1];
> > > > }
> > > > for( i = 0; i < delta; i++)
> > > > {
> > > > PFO[ i-1 ] = 0;
> > > > PFC[ i-1 ] = 0;
> > > > }
> > > > AFL.Var("PFO") = PFO;
> > > > AFL.Var("PFC") = PFC;
> > > > %>
> > > >
> > > > O = PFO;
> > > > C = PFC;
> > > >
> > > > H = (O+C)/2;
> > > > L = (O+C)/2;
> > > >
> > > > GraphXSpace = 9;
> > > > Graph0Style = 64;
> > > >
> > > > Graph0Color =1;
> > > > Graph0 = C;
> > > >
> > > > Thanks in advance for any reply.
> > > > Dimitris Tsokakis
> > > >
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