[amibroker] Re: Tiny red and green arrows on chart ?

["TomB" <directaim@xxxxxxxxx>]

Mike

Thanks for your response
and the shapes-cheat-sheet.

In this case though
there are four 'PlotShapes' statements for:

PivotLow
PivotHigh
Buy_Valid
Sell_Valid

and in all cases they are set to 0 or 1.

This is the code 
if you would like to take a look for any flaw ?

//Zig Zag Indicator with Valid Entry and Exit Points
//Author/Uploader: Eric Tangen


//z_ZigZagValid
// ******** CHARTING 
PercentChange = 6;
mystartbar = SelectedValue(BarIndex());  // FOR GRAPHING

mystartbardate = LastValue(ValueWhen(mystartbar == BarIndex(), DateNum(),1));

InitialValue = LastValue(ValueWhen(mystartbardate == DateNum(), C , 1 ) ) ;
Temp1 = IIf(BarIndex() >= mystartbar, InitialValue, Null) ;


Plot(Temp1, " ", colorBlack,styleLine);
Plot((1+(LastValue(PercentChange)/100))*(Temp1), " ", colorGreen, styleLine) ;
Plot((1-(LastValue(PercentChange)/100))*(Temp1), " ", colorRed, styleLine) ;

ZZ = Zig(C,LastValue(PercentChange)) ; 
PivotLow = Ref(IIf(Ref(ROC(ZZ,1),-1) < 0 AND ROC(ZZ,1) > 0, 1, Null),1);
PivotHigh = Ref(IIf(Ref(ROC(ZZ,1),-1) > 0 AND ROC(ZZ,1) < 0, 1, Null),1);

PlotShapes( shapeCircle*PivotLow, colorGreen,0, L, -20) ; 
PlotShapes( shapeCircle*PivotHigh,colorRed,0,H, 20) ;



Buy_Valid = IIf(C>(1+(LastValue(PercentChange)/100))*(ValueWhen(PivotLow, C, 1))
AND ROC(ZZ,1) > 0,1,0); 
Sell_Valid = IIf(C<(1-(LastValue(PercentChange)/100))*(ValueWhen(PivotHigh, C, 1))
AND ROC(ZZ,1) < 0,1,0); 

Buy_Valid = ExRem(Buy_Valid,Sell_Valid);
Sell_Valid = ExRem(Sell_Valid,Buy_Valid);

PlotShapes( shapeUpArrow*Buy_Valid, colorGreen,0, L, -20); 
PlotShapes( shapeDownArrow*Sell_Valid, colorRed,0,H, -20) ;

BarColors = 
IIf(BarsSince(Buy_Valid) < BarsSince(Sell_Valid) 
AND BarsSince(Buy_Valid)!=0, colorGreen,
IIf(BarsSince(Sell_Valid) < BarsSince(Buy_Valid)
AND BarsSince(Sell_Valid)!=0,  colorRed, colorBlue));

Plot(C, " ", BarColors,  styleBar ) ; 
Plot(ZZ," ", colorLightGrey,styleLine|styleThick);
Plot(ZZ," ", BarColors,styleDots|styleNoLine);

Title = Name() + " " + Date() + WriteIf(PivotLow, " Up Pivot ","")+WriteIf(PivotHigh," Down Pivot ","")+ WriteIf(Buy_Valid, " Buy Point ", "") + WriteIf(Sell_Valid, " Sell Point ", "") ;



--- In amibroker@xxxxxxxxxxxxxxx, "Mike" <sfclimbers@xxx> wrote:
>
> Tom,
> 
> Most likely you are passing an array to the PlotShapes statement that has incorrectly calculated the shape value. Double check your calculation for the first argument.
> 
> Note that the typical construct is to multiply a true/false (i.e. 1/0) by the desired shape value.
> 
> e.g. Buy * shapeUpArrow
> 
> However, if the Buy array above holds "true" values that are not "1", then the multiplication will result in a shape value that is not the one you intended.
> 
> See the following article for the realm of all possible shape values. The ones that you are describing sound to be in the range 57-62.
> 
> http://www.amibroker.org/userkb/2008/03/15/afl-shapes-cheat-sheet/
> 
> Mike
> 
> --- In amibroker@xxxxxxxxxxxxxxx, "TomB" <directaim@> wrote:
> >
> > 
> > Most areas of a chart 
> > are showing tiny red and green arrows
> > along the bars.
> > 
> > Everything else shows up ok.
> > 
> > I can find no mention of these arrows
> > in the manual or in a search.
> > 
> > How can these be eliminated?
> >
>




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