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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);
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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