Sent: Monday, January 05, 2009 6:51
PM
Subject: Re: [amibroker] Graphing beyond
the data
You guys really don't see the light at the end of
tunnel.
You need to think OUTSIDE THE BOX.
Shifting and Extending is fundamentally THE
SAME
(The end effect is identical).
You need to DROP the relationship of bar vs
time.
It does not matter.
It is completely irrelevant what timestamp given bar
has.
Say you need to calculate TOMMORROWS value
using close value of today, yesterday and day before
yesterday:
Y[ tommorrow ] = m * C[ today ] + n * C[ yesterday
] + p * C[ day before yesterday ].
So tommorrows value in AFL language would be:
Y TOMMORROW = m * Close + n * Ref( Close, -1 ) + p *
Ref( Close, -2 );
And such tommorrows value can be plotted using XShift
feature (just specify XShift=1)
Give me ANY practical problem you got with plotting
into the future and I will show you
how to implement in AFL.
Wavemechanic: you are using wrong
code. Extending is not just adding xSHIFT to
Plot()
If you want to extend you need to have calculation
corresponding to the fact
that you will be shifting the plot later!
The following formula DEMONSTRATES how to do that. Note that
extension is
provided as PARAMETER so you can see that plot can be
extended into the future
without changing sine wave.
Var1 = Param( "Var1",
0.2, 0, 1, 0.01
);
Extend = Param("How many bars to
extend", 0, 0,
30, 1 );
x = sin(
Cum( Var1 ) + Extend * Var1 );
Plot( x, "", colorRed, styleLine, Null, Null, Extend );
Plot( C, "",
colorPaleGreen,
styleBar |
styleOwnScale
);
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
Sent: Monday, January 05, 2009 10:40
PM
Subject: Re: [amibroker] Graphing
beyond the data
Bill,
I agree with you....even from the example that
Tomasz provided...I see it as just shifting the current plot to the
right....
not actually calculating some future values and
then plotting them to the right of the last value....
In the example...if you remove the 25 from the
plot statement
Plot( me52,"S1", IIf( Avg26_9
>
me52,colorOrange,colorBlueGrey),styleCloud,Null,Null,25);
It will move / shift the plot
back to the left...
Anthony
----- Original Message -----
Sent: Monday, January 05, 2009 4:23
PM
Subject: Re: [amibroker] Graphing
beyond the data
TJ,
I don't think we are talking about the same
thing perhaps because of our understanding of the words "shift"
and "extend". To me "shift" means to move to the right into the
blank space and "extend" means to calculate new values in the blank
space.
The problem as I see it is shown in the screen
shot below (bars are included for counting purposes). Two charts of
a sine curve in which one is shifted with Plot() by 10 bars into the blank
space. By the definitions above, if the curve is simply
shifted the last value will remain unchanged (as shown) whereas an
extended curve would have a last value around 1 rather than
-1.
Based on the definitions above, I view these
charts as evidence that Plot() shifts the curve and does not calculate
what the value should be 10 bars into the future. As far as I can
tell, the "extend" parameter in LineArray() actually does extend into
the future as do the charting tools.
Definitions aside, am I using Plot() correctly
or is there a way to use Plot() in order to get what I call "extend"
functionality. The type of functionality is what is needed for
a variety of studies of the type shown in the TradeStation screen
shots.
Bill
----- Original Message -----
Sent: Monday, January 05, 2009 2:38
PM
Subject: Re: [amibroker] Graphing
beyond the data
No I did not miss the point.
The supported way to EXTEND indicators is to calculate
them as usual and
plot using XShift. In this approach you are
using LAST X bars of
array
as "future"
bars. Then to actually display these future bars at
correct place
you use XShift.
Best regards,
Tomasz
Janeczko
amibroker.com
----- Original Message -----
Sent: Monday, January 05, 2009
7:40 PM
Subject: Re: [amibroker] Graphing
beyond the data
TJ,
I think you missed the point. The
problem is one of extension not shifting which Plot() cannot
handle. Extending indicators, as Robert and many of us want to
do, is necessary to identify future values for a variety of
studies, including Hurst channel projections, cycles, etc.
Here are TradeStation examples showing the extension of the
analysis (not a shift) into the future.
Bill
----- Original Message -----
Sent: Monday, January 05, 2009
10:10 AM
Subject: Re: [amibroker]
Graphing beyond the data
Hello,
You can do that using XShift parameter
of Plot() function
http://www.amibroker.com/f?plot
For
coding example, see DispMA (displaced moving average)
that is
shipped with AmiBroker
Best regards,
Tomasz
Janeczko
amibroker.com
----- Original Message -----
From:
"Robert" <disqplay0@xxxxxxcom>
To:
<amibroker@xxxxxxxxxps.com>
Sent:
Monday, January 05, 2009 3:25 PM
Subject: [amibroker] Graphing
beyond the data
>I have been working on an indicator
that would look into the futur if
> the trend continues or if
it reverses. It will graph to the last day
> of data but I am
presently looking at a five day look ahead. Is there
> a way
to graph the pridicted price beyond the last data point? If so
> a shove in the right direction would help. Not really sure
how to do
> this but would like to learn, thanks in advance
for any support you
> can give to this question.
>
> Disq
>
>
>
>
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