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<SPAN
class=129330813-26072004>Thanks for your reply Herman, but we've had this
discussion before (:-). This is from my 6/27 reply to similar responses when I
first posted about this:
<SPAN
class=129330813-26072004>
<SPAN
class=129330813-26072004><SPAN
class=476020112-27062004><FONT
size=2>----------<SPAN
class=476020112-27062004>-----
<SPAN
class=129330813-26072004>
<SPAN
class=476020112-27062004>Thanks for your reply Graham, but as I mentioned, I've
tried that, and it has problems.
<SPAN
class=476020112-27062004>
<SPAN
class=476020112-27062004>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.<SPAN
class=476020112-27062004>
<SPAN
class=476020112-27062004>
<FONT face="Courier New" color=#0000ff
size=2>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.
<SPAN
class=476020112-27062004>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.
<SPAN
class=476020112-27062004>
<SPAN
class=476020112-27062004>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?
<SPAN
class=476020112-27062004>
<SPAN
class=476020112-27062004>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.
<SPAN
class=476020112-27062004>
<SPAN
class=476020112-27062004>Clearer?
<SPAN
class=476020112-27062004>
<FONT
color=#0000ff>Dave
Merrill
<SPAN
class=476020112-27062004>
<FONT
face="Courier New">-----<SPAN
class=476020112-27062004>-----<SPAN
class=476020112-27062004>-----
<SPAN
class=476020112-27062004>global gBI, gBarsBlanked;
<SPAN
class=476020112-27062004>gBarsBlanked = Param( "bars", 0, 100, 0, -1);gBI =
BarIndex();
<SPAN
class=476020112-27062004>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";}
<SPAN
class=476020112-27062004>BlankAll();//BlankAll2();
<SPAN
class=476020112-27062004>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);
<SPAN
class=476020112-27062004>m = MACD(); r = RSI(); s = SAR();
<SPAN
class=476020112-27062004>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);*/
<SPAN
class=476020112-27062004>
<FONT
color=#0000ff>----------<SPAN
class=476020112-27062004>-----
<BLOCKQUOTE dir=ltr
>
This
removes bars under param() control.<SPAN
class=421373612-26072004><FONT face=Arial color=#0000ff
size=2>herman
Z = <FONT
face="Lucida Console">Null;LB =<FONT
color=#0000ff>LastValue(<FONT
color=#0000ff>BarIndex());O<FONT
size=2> = IIf(<FONT
color=#0000ff>BarIndex()>(LB-RM),Z,O);<FONT
size=2>H = IIf(<FONT
color=#0000ff>BarIndex()>(LB-RM),Z,H);<FONT
size=2>L = IIf(<FONT
color=#0000ff>BarIndex()>(LB-RM),Z,L);<FONT
size=2>C = IIf(<FONT
color=#0000ff>BarIndex()>(LB-RM),Z,C);<FONT
face="Lucida Console" color=#008000 size=2>// Just an example
systemStochRsi=EMA((<FONT
color=#0000ff>RSI(8)-<FONT
color=#0000ff>LLV(RSI(<FONT
color=#ff00ff>8),8))/(<FONT
color=#0000ff>HHV(RSI(<FONT
color=#ff00ff>8),8)-<FONT
color=#0000ff>LLV(RSI(<FONT
color=#ff00ff>8),8)),<FONT
color=#ff00ff>3)*100;<FONT
size=2>Buy=Cross(<FONT
color=#ff00ff>17,StochRsi) AND <FONT
color=#0000ff>Ref(MA(C,<FONT
color=#ff00ff>21),-1) < <FONT
color=#0000ff>MA(C,<FONT
color=#ff00ff>21);;Sell<FONT
size=2>=Cross(StochRsi,<FONT
color=#ff00ff>83);Short<FONT
size=2>=Cross(StochRsi,<FONT
color=#ff00ff>83) AND Ref(<FONT
color=#0000ff>MA(C,21),-<FONT
color=#ff00ff>1) > MA(C,<FONT
color=#ff00ff>21);Cover<FONT
size=2>=Cross(<FONT
color=#ff00ff>17,StochRsi);<FONT
size=2>Plot(C,<FONT
color=#ff00ff>"Close",2,<FONT
color=#ff00ff>1);<FONT
size=2>PlotShapes(<FONT
color=#0000ff>IIf(Buy,shapeUpArrow,<FONT
color=#0000ff>IIf(Short,shapeDownArrow,shapeNone)),<FONT
color=#0000ff>IIf<FONT
size=2>(Buy,colorBrightGreen,<FONT
color=#0000ff>IIf(Short,colorRed,colorBlack)));
-----Original Message-----From: Dave
MerrillSent: Monday, July 26, 2004 8:26 AMTo:
amibroker@xxxxxxxxxxxxxxxSubject: RE: [amibroker] Training
mode.
<SPAN
class=606461512-26072004>I've asked for something similar myself, maybe with
a slider or something to control the number of bars blanked at the end,
rather than only stepping through one at a time. Besides training your mind,
it's also useful for evaluating the behavior of indicators that "guess"
about the future, or for other reasons change shape as more data becomes
available.
<SPAN
class=606461512-26072004>
<SPAN
class=606461512-26072004>The closest I know of that you can do currently is
to set all prices after a certain bar to null. Some types of indicators do
odd things right at the transition point, so you may need to null them out
too. For that reason, you may have to recode this arrangement specifically
for every pane, not idea;.
<SPAN
class=606461512-26072004>
<SPAN
class=606461512-26072004>It also won't remove hand-drawn studies, much less
put them back later. You might be able to code up something that sets the
color of studies to your background color, maybe?
<SPAN
class=606461512-26072004>
<SPAN
class=606461512-26072004>It's better than nothing, and AFIK, the best we can
do without it being built into AB, but I too hope Tomasz adds a feature like
this.
<SPAN
class=606461512-26072004>
<SPAN
class=606461512-26072004>Dave Merrill
<BLOCKQUOTE
>I
would like to set AB's data to a selected date back in time, clear of
all existing studies I might have drawn like trendlines ect, but
trendlines and other studies are able to be drawn. Then every time the
space bar is pressed a new days(weeks or tick) worth of data is
added.The reason for this of cause is to test or practice trading
like backtesting your idears and instinks in real time.
Is there currently a way to do this?Downloading each days
history is not a solution. To time consuming.Any idear?Thanks
Ant.
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