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Bill,
Thanks - I finally figured out how to extend a line into the future
without changing the existing line values. I provided examples below
of the problem I was having along with the one that plots correctly.
Your formula shifts the line for existing data to a totally different
position. Your feedback motivated me to take one more shot at
figuring it out. One question I do have about the following code is
this - when I remove "numbars" from the code the lines no longer
plot. I don't understand why the numbars statement is necessary. Any
ideas as to why this is?
Regards,
David
numbars = LastValue(Cum(Status("barvisible")));
pct = Param("Pivot %", 0.50, 0.10, 20, 0.001);
lookbak = Param("Look back", 10, 1, BarCount-1);
shift= Param("Line Shift",20,0,50,1);;
pk=PeakBars(H,pct)==0; tr=TroughBars(L,pct)==0;
zHi=Zig(H,pct); zLo=Zig(L,pct); HLAvg=(zHi+zLo)/2;
zp=IIf(pk,zHi,IIf(tr,zLo,IIf(HLAvg>Ref(HLAvg,-1),H,L)));
za=Zig(zp,pct);
pR=Ref(za,-1)<za AND za>Ref(za,1);
pS=Ref(za,-1)>za AND za<Ref(za,1);
////////////////////
Price = ParamList("Price Array", "Close|High|Low|zHiLo", 1);
if(Price=="Close") P = Zig(C, Pct);
else if(Price=="High") P = Zig(H, Pct);
else if(Price=="Low") P = Zig(L, Pct);
else P = Zig(zp, Pct);
//////////////////////////////////////////////////////////////////
Plot(C, "", IIf(O>C, 27,IIf(O<C, 32,36)), ParamStyle("Price
Style",styleBar,maskPrice));
Plot(P, "Zig", colorGold, styleThick|styleNoLabel);
//////////////////////////////////////////////////////////////////
pk = PeakBars(P, pct) == 0;
tr = TroughBars(P, pct) == 0;
x=BarIndex();
shift=20;
xs0=LastValue(ValueWhen(tr,x,lookbak+1));
ys0=LastValue(ValueWhen(tr, L,lookbak+1));
xs1= LastValue(ValueWhen(tr,x,lookbak));
ys1= LastValue(ValueWhen(tr,L,lookbak));
x1=LineArray(xs0,ys0,xs1,ys1,1);// Line extended to last bar
Plot(x1,"",6,1);
Plot(x1,"",3,1,Null,Null,shift);//shift changes xs0,ys0,xs1 and ys1
x2=LineArray(xs0-shift,ys0,xs1,ys1,1);//shift changes existing values
Plot(x2,"",5,1,Null,Null,shift);
x3=LineArray(xs0-shift,ys0,xs1-shift,ys1,1);//correct extension
Plot(x3,"",32,4,Null,Null,shift);
--- In amibroker@xxxxxxxxxxxxxxx, "wavemechanic" <timesarrow@xxx>
wrote:
>
> Does this do what you want?
>
> x = linearray(x, y, z, w, 1);
> plot(x, "", color, null, null, 10);
>
> Bill
> ----- Original Message -----
> From: wooziwog
> To: amibroker@xxxxxxxxxxxxxxx
> Sent: Tuesday, January 06, 2009 12:10 PM
> Subject: [amibroker] Re: Graphing beyond the data
>
>
> Hello,
>
> It seems you are well versed with future arrays. Could you
provide
> an example of how to code a line array to simply plot into the
future
> without changing x0,y0,x1, and y1 of the array for current bars?
I
> have tried using the slope of the line, negative offsets for the
> current line that equal the shift into the future etc. but none
of it
> works for me. The problem I am having is a simple one - I do not
> want any of the historical graph changed (no shifting of graphed
data
> that already exists). My objective is to simply "continue" the
line
> array into the future at the same slope as currently exists for
> existing data.
>
> Thanks,
>
> David K.
>
> --- In amibroker@xxxxxxxxxxxxxxx, "Ton Sieverding"
> <ton.sieverding@> wrote:
> >
> > But that's not what I am doing, Anthony. I am calculating
something
> in an 'actual' array as if it is in the future. Then because I
want
> to see it in the future I am shifting the array. Let's take a
simple
> example. I want to simulate the SP500 in the future. Therefore I
> mirror the SP500 let's say over the last 20 days in a new array.
Now
> I want to see the SP500 in the future. So therefore I am shifting
the
> mirrored time series and get something like underneath graph :
> >
> >
> >
> > The Ichimoku example Tomasz gave is exactly the same story. He
> calculated a future value in an 'actual' array and then shifted
the
> array in the future because there you want to see the result. The
> fact he is doing a calculation in an 'actual' array does not mean
> that he is not doing future calculations ...
> >
> > Regards, Ton.
> >
> > PS : Please no remarks about the enclosed code. It's just an
> example I was using for a group that's working with AmiBroker
here in
> Belgium. It does what it should do but ...
> >
> > ----- Original Message -----
> > From: Anthony Faragasso
> > To: amibroker@xxxxxxxxxxxxxxx
> > Sent: Tuesday, January 06, 2009 12:38 PM
> > Subject: Re: [amibroker] Graphing beyond the data
> >
> >
> >
> > Ton,
> >
> > I commented on Tomasz's example....I do not see where the
example
> is calculating a future value, Do you ?
> >
> > If so, Please point it out to me.....
> >
> > Thanks
> > Anthony
> >
> > PS. If you are calculating all sorts of future
values....maybe
> you would be so kind as to post an example.
> >
> > ----- Original Message -----
> > From: Ton Sieverding
> > To: amibroker@xxxxxxxxxxxxxxx
> > Sent: Tuesday, January 06, 2009 4:06 AM
> > Subject: Re: [amibroker] Graphing beyond the data
> >
> >
> >
> > Frankly I do not see the difference Anthony. I am
calculating
> all kinds of values in an array that are based upon the future.
After
> having done so, I am shifting the array in the future for visual
> purpose. But that's just to show me the values in the graph on
the
> right place. When making future calculations in the array for me
> there is no difference between shifting and extending. So I just
do
> not get your problem ...
> >
> > Regards, Ton.
> >
> > ----- Original Message -----
> > From: Anthony Faragasso
> > To: amibroker@xxxxxxxxxxxxxxx
> > 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 -----
> > From: wavemechanic
> > To: amibroker@xxxxxxxxxxxxxxx
> > 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 -----
> > From: Tomasz Janeczko
> > To: amibroker@xxxxxxxxxxxxxxx
> > 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 -----
> > From: wavemechanic
> > To: AmiBroker, User
> > 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 -----
> > From: Tomasz Janeczko
> > To: amibroker@xxxxxxxxxxxxxxx
> > 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@>
> > To: <amibroker@xxxxxxxxxxxxxxx>
> > 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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This is *NOT* technical support channel.
*********************
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