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Ooops! YHOO is eating my lines !!See addition below.
--- In amibroker@xxxxxxxxxxxxxxx, "DIMITRIS TSOKAKIS" <TSOKAKIS@xxxx>
wrote:
> Dave,
> There is no problem to hide any last d bars of OHLC or any other
> indicator.
> [d should be the same for OHLC but, it may be different for each
> indicator ]
>
> // Definition of Hide() function
> function Hide(Var,d)
> {
> newvar=0;
> newvar=IIf(Cum(1)<=LastValue(Cum(1))-d,Var,Null);
> return newvar;
> }
> //Applications
> p=5;
> O1=Hide(O,p);
> H1=Hide(H,p);
> L1=Hide(L,p);
> C1=Hide(C,p);
PlotOHLC(O1,H1,L1,C1,"c",1,styleCandle);
> Plot(Hide(MACD(),2*p),"MACD",colorRed,styleLeftAxisScale);
> Plot(Hide(Signal(),2*p-1),"SIGNAL",colorBlue,styleLeftAxisScale);
>
> Dimitris Tsokakis
> --- In amibroker@xxxxxxxxxxxxxxx, "Dave Merrill" <dmerrill@xxxx>
> wrote:
> > Thanks for your reply Graham, but as I mentioned, I've tried
that,
> and it
> > has problems.
> >
> > Try the more complete setup below, with a couple of random
> indicators added.
> > Everything's fine with nothing blanked. Blank out one bar, and
the
> price
> > plot still looks fine, but MACD and RSI spike to zero on the null
> price
> > bars, causing them to rescale, the MACD illegibly. Blank a few
more
> bars,
> > past a SAR cross, and SAR does the same thing.
> >
> > For another approach, comment out the BlankAll() line, and re-
enable
> > BlankAll2(), on the next line. This shifts everything to the
> right, "off the
> > page", and then back. I tried this because that seemed very
> analgous to
> > those bars really not existing. Turns out that AB seems to treat
> them as
> > missing data (makes sense), and uses the existing last value for
> the missing
> > bars.
> >
> > Is there a way to work around all this? Of course, blank the
> indicators too.
> > But that means you have to recode every indicator on any pane you
> want to do
> > this with.
> >
> > I'd much rather just drop in a single function to adjust the
price
> bars, and
> > have everything just work. But setting things to null doesn't
> really do it.
> > Any other ideas on a good blanking mechanism?
> >
> > What I'd really like is a built in feature that handled this
> automatically,
> > including blanking BuyPrice, ShortPrice etc, and any new built in
> variables
> > as they get added.
> >
> > Clearer?
> >
> > Dave
> >
> > ---------------
> > global gBI, gBarsBlanked;
> >
> > gBarsBlanked = Param( "bars", 0, 100, 0, -1);
> > gBI = BarIndex();
> >
> > function IsBlanked() {
> > return gBI >= (BarCount - gBarsBlanked);
> > }
> > function Blank(array) {
> > x = IIf(IsBlanked(), Null, array);
> > return x;
> > }
> > function Blank2(array) {
> > x = Ref(Ref(array, -gBarsBlanked), gBarsBlanked);
> > return x;
> > }
> > function BlankAll() {
> > O = Blank(O); H = Blank(H); L = Blank(L); C = Blank(C);
> > Avg = Blank(Avg); V = Blank(V);
> > }
> > function BlankAll2() {
> > O = Blank2(O); H = Blank2(H); L = Blank2(L); C = Blank2(C);
> > Avg = Blank2(Avg); V = Blank2(V);
> > }
> > function OHLCTitle() {
> > return
> > Interval(2) + " " + Date()
> > + " Open = " + O
> > + ", High = " + H
> > + ", Low = " + L
> > + ", Close";
> > }
> >
> > BlankAll();
> > //BlankAll2();
> >
> > GraphXSpace = 5;
> > Plot(C, OHLCTitle(), colorDefault, styleCandle);
> > Plot(V, "Volume", colorBlue, styleHistogram+styleOwnScale, 0,
> > LastValue(Highest(V)) * 2);
> > //Plot(IIf(IsBlanked(), 1, 0), "", colorLightGrey,
> > styleArea+styleOwnScale+styleNoLabel, 0, .5);
> >
> > m = MACD(); r = RSI(); s = SAR();
> >
> > Plot(m, "MACD", colorBlue, styleOwnScale);
> > Plot(r, "RSI", colorRed, styleOwnScale);
> > Plot(s, "SAR", colorYellow, styleDots+styleNoLine);
> > /*
> > Plot(Blank(m), "MACD", colorBlue, styleOwnScale);
> > Plot(Blank(r), "RSI", colorRed, styleOwnScale);
> > Plot(Blank(s), "SAR", colorYellow, styleDots+styleNoLine);
> > */
> >
> > ---------------
> > Try this as an example
> >
> > x = Param( "bars", 1, 1, 10, 1);
> >
> > Plot( IIf( BarIndex()<=BarCount-x, C, Null), "", colorBlack,
> styleCandle);
> >
> > Cheers,
> > Graham
> > http://e-wire.net.au/~eb_kavan/
> >
> > -----Original Message-----
> > Sometimes when I'm working on an indicator, or training my eye,
> I'd like
> > to
> > blank out a Param-able number of bars at the end. Not set them
to
> zero,
> > but
> > make it like they haven't happened and don't exist yet. I don't
> want to
> > see
> > them, and I don't want any indicators to be effected by them,
> kind of a
> > controllable curtain over the end of the past.
> >
> > Does anyone have a good way to do this?
> >
> > Visually, setting the end bars to the background color works
> fine, but
> > preventing indicators from seeing them is harder. Setting them
to
> null or
> > zero isn't the same thing; some indicators spike to infinity,
or
> do
> > something else besides just cut off there, the way they do at
the
> end of
> > all existing bars.
> >
> > I've tried nested positive and negative Ref functions, pushing
> the end
> > bars
> > "off the map", then moving them back on, but that seems to
leave
> the
> > effected bars at the value of the last unaffected bar.
> >
> > Any ideas? If not, would anyone else like to see a feature like
> this built
> > into AB?
> >
> > Dave Merrill
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