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Dave,
I saw your code, the concept has some problems indeed.
The Hide(var,d) does not have these problems, no strange zeros/peaks
etc, it just does what promisses, hiding the last d bars of a n y
variable var. Try both codes and you will see the difference.
The rest is a matter of taste.
Dimitris Tsokakis
--- In amibroker@xxxxxxxxxxxxxxx, "Dave Merrill" <dmerrill@xxxx>
wrote:
> Thanks for chiming in Dimitris, but with all due respect, this is
the same
> idea that I originally said has problems when I asked the question,
and the
> same as what Graham suggested. Did you look at the code I posted?
The
> function Blank() in there does this too. Yes, it's workable if you
modify
> every indicator on every pane where you want to do this, but that's
not
> ideal.
>
> Dave
> --- 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/
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