How to correct errors in the Indicators(AFLS)

hmsanil

Active Member
#1
I have seen in many threads like peoples saying error all the time when they try out the afls (indicator).
But that is very easy to correct errors on their own; they need not know programming language to correct these mistakes. It’s very simple

Copy the afl.
Go to Amibroker>Analysis >Formula Editor
An empty editor will open
Paste the afl code there
Then go to Tools>Verify Syntax in the editor itself
It will show a list of errors if it’s their in the afl

I will show with example
copy the below afl in to the editor

// Code Starts here


_SECTION_BEGIN("MA Diff");
T=26;
KMA=((C-MA(C,T))/MA(C,T))*100;
Graph0=KMA;
Graph0Style=2+4;
Graph0BarColor=IIf(KMA>0,5,4);
GraphXSpace=5;

_SECTION_END();

_SECTION_BEGIN("Price");
SetChartOptions(0,chartShowArrows|chartShowDates);
Plot( C, "Close", ParamColor("Color", colorBlack ), styleNoTitle | ParamStyle("Style") | GetPriceStyle() );
_SECTION_END();

//------------------------------------------------------------------------------

_SECTION_BEGIN("ZIG-ZAG");
P = ParamField( "Price field" );
change = Param("% change",5,0.1,25,0.1);
_SECTION_END();

_SECTION_BEGIN("EMA");
P = ParamField("Price field",-1);
Periods = Param("Periods", 15, 2, 300, 1, 10 );
_SECTION_END();

_SECTION_BEGIN("MACD Exploration");
r1 = Param( "Fast avg", 12, 2, 200, 1 );
r2 = Param( "Slow avg", 26, 2, 200, 1 );
r3 = Param( "Signal avg", 9, 2, 200, 1 );
Z=Param("zig",1,0,10,0.1);


Cond1 = Cross(MACD(r1,r2),Signal(r1,r2,r3));

Cond3 = Zig(C,z)>Ref(Zig(C,z),-4);
Buy = Cond1 AND Cond3;

Cond4 = Cross(Signal(r1,r2,r3),MACD(r1,r2));

Cond6 = Zig(C,z)<Ref(Zig(C,z),-4);
Sell = Cond4 AND Cond6;
Trigger = WriteIf(Buy, "Buy", "") + WriteIf(Sell, "Sell", "");

_N(Title = StrFormat("{{NAME}} {{DATE}} {{INTERVAL}}: O=%1.2f, H=%1.2f, L=%1.2f, C=%1.2f, V=%1.0f\n{{VALUES}}", O, H, L, C, V));

BG = IIf(Buy, colorPaleGreen, IIf(Sell, colorRose, colorDefault));
FG = IIf(Buy, colorDarkGreen, IIf(Sell, colorDarkRed, colorDefault));

if(Status("action") == actionIndicator)
{
Plot(C, "", colorGrey50, styleBar);
//PlotShapes(IIf(Buy, shapeCircle, shapeNone),colorBlue, 0,L, Offset=-60);
//PlotShapes(IIf(Sell, shapeCircle, shapeNone),colorBlue, 0,H, Offset=-30);

}

//------------------------------------------------------------------------------------------------
if(Status("action") == actionExplore)

Filter = Buy OR Sell;
SetOption("NoDefaultColumns", True);

AddTextColumn(Name(), "Symbol", 77, FG, BG, 120);
AddColumn(DateTime(), "Date", formatDateTime, FG, BG, 100);
AddColumn(TimeNum() ,"Time",1);
AddColumn( C, "Close", 1.3 );
AddColumn( H, "High", 1.3 );
AddColumn(V, "Volume");
AddColumn(Ref(V,-1),"P-Vol");
AddColumn(V/Ref(V,-1)*100,"Increase in Vol");
AddColumn( Buy, "Buy", 1 );
AddColumn( Sell, "Sell", 1 );

shape = Buy * shapeHollowUpTriangle + Sell * shapeHollowDownTriangle;

PlotShapes( shape, IIf( Buy, colorBlue, colorBlue ), 0, IIf( Buy, Low, High ) );

GraphXSpace = 7;

GraphXSpace = 7;
_SECTION_END();

_SECTION_BEGIN("EMA3");
P = ParamField("Price field",-1);
Periods = Param("Periods", 15, 2, 300, 1, 10 );
_SECTION_END();


_SECTION_BEGIN("Background text");
C13=Param("fonts",20,10,30,1 );
C14=Param("left-right",2.1,1.0,5.0,0.1 );
C15=Param("up-down",12,1,20,1 );
Miny = Status("axisminy");
Maxy = Status("axismaxy");
lvb = Status("lastvisiblebar");
fvb = Status("firstvisiblebar");
pxwidth = Status("pxwidth");
pxheight = Status("pxheight");
GfxSetBkMode(transparent=1);
GfxSetOverlayMode(1);
GfxSelectFont("Tahoma", Status("pxheight")/C13 );
GfxSetTextAlign( 6 );
GfxSetTextColor( ColorRGB (217,217,213));
GfxTextOut( Name(), Status("pxwidth")/C14, Status("pxheight")/C15 );
GfxSelectFont("Tahoma", Status("pxheight")/C13*0.5 );
GfxSetTextColor( ColorRGB (103,103,103));
GfxTextOut( "AJEET SINGH", Status("pxwidth")/C14, Status("pxheight")/C15*2.5 );
GfxSelectFont("Tahoma", Status("pxheight")/C13*0.5 );
GfxSetTextColor( ColorRGB (103,103,103));
GfxTextOut( "[email protected]", Status("pxwidth")/C14, Status("pxheight")/C15*4 );
GfxSelectFont("MS Sans Serif", 10, 500, False, False, 0);
//Second phase starts Here
//File: BHS Chart
_SECTION_BEGIN("Trading");
//SetChartBkColor(ParamColor("Outer panel color ",colorLightYellow));
SetChartBkColor(ParamColor("BackGround Color", colorBlack));
pShowtradeLines = ParamToggle("Show Trade Lines", "No|Yes", 1);
pShowMarkers = ParamToggle("Show Markers", "No|Yes", 1);
synch=ParamToggle("Synchronize buy/short with foreign index", "No|Yes", 1);
Volmin=Param("Volume minimum",5000,0,10000000,50);
Volmax=Param("Volume maximum",1000000,0,10000000,50);
priceRL=Param("Price Range Min",150,1,20000,1);
priceRH=Param("Price Range Max",3000,1,20000,1);
PercChangemin=Param("Percentage Change Min set", -25, -100, 100, 0.1);
PercChangemax=Param("Percentage Change Max set", 25, -100, 100, 0.1);
PerctakeProfit=Param("Take Profit Percent Set",0.6,0.3,30,0.1);
PercStoploss=Param("StopLoss Percent Set",0.25,0.2,5,0.1);

PlotOHLC(Open,High,Low,Close,"",colorWhite,styleCa ndle);
Bars = 0;
xpdh = 90;

{
Plot_Range = (TimeNum() >= 85500 AND TimeNum()<= 153500) AND (DateNum()==LastValue(DateNum()));
FH_Range = (TimeNum() >= 085500 AND TimeNum()<= 093000) AND (DateNum()==LastValue(DateNum()));

FH_Prices = High * FH_Range;
FH_Marker = BarsSince(FH_Range>0);

Num_Bars = 36000 / Interval(1);

TimeFrameSet(inDaily);
TOP_ = Open;
PDH_ = Ref(High,-1);
PDL_ = Ref(Low,-1);
PDO_ = Ref(Open,-1);
PDC_ = Ref(Close,-1);
PDM_ = (PDH_+PDL_)/2;
TimeFrameRestore();

isAll = True;
isRth = TimeNum() >= 085400 AND TimeNum() <= 093000;
isdRth = TimeNum() >= 085400 AND TimeNum() <= 160000;

aRthL = IIf(isRth, L, 1000000);
aRthH = IIf(isdRth, H, Null);
aRthLd = IIf(isdRth, L, 1000000);

TOP = TimeFrameExpand(TOP_,inDaily,expandFirst);
PDH = TimeFrameExpand(PDH_,inDaily,expandFirst);
PDL = TimeFrameExpand(PDL_,inDaily,expandFirst);
PDO = TimeFrameExpand(PDO_,inDaily,expandFirst);
PDC = TimeFrameExpand(PDC_,inDaily,expandFirst);
PDM = TimeFrameExpand(PDM_,inDaily,expandFirst);
FHH = Ref(HHV(High*FH_Range,Num_Bars),-FH_Marker);
FHL = TimeFrameCompress( aRthL, inDaily, compressLow );
FHL = TimeFrameExpand( FHL, inDaily, expandFirst );
DayH = TimeFrameCompress( aRthH, inDaily, compressHigh );
DayH = TimeFrameExpand( DayH, inDaily, expandFirst );
DayL = TimeFrameCompress( aRthLd, inDaily, compressLow );
DayL = TimeFrameExpand( DayL, inDaily, expandFirst );


FC1=((PDH-PDL)*0.433);
FC2=((PDH-PDL)*0.7666);
FC3=((PDH-PDL)*1.355);
FC4=(FHH-FHL);

A=IIf((FC4<=FC1+PDH*0.005),FC1,0);
B=IIf((FC4<=FC2+PDH*0.005 AND FC4>FC1+PDH*0.005),FC2,0);
Cl=IIf((FC4<=FC3 AND FC4>FC2+PDH*0.005),FC3,0);
AF=(A+B+Cl);

//foreign
_SECTION_BEGIN ("foreign Index bar graph");
Vr=ParamList("Index",List = "^NSEI,^NSEBANK,^CNXIT,^NSMIDCP,RELIANCE.NS,SBIN.N S",0);
SetForeign(Vr);
HaC =(O+H+L+C)/4;
HaO = AMA( Ref( HaC, -1 ), 0.5 );
HaH = Max( H, Max( HaC, HaO) );
HaL = Min( L, Min( HaC, HaO) );
BG3=HHV(LLV(HaL,4)+ATR(4),8);
BR3=LLV(HHV(HaH ,4)-ATR(4),8);
co = IIf(Hac>BG3 ,colorBrightGreen,IIf(Hac < BR3,colorRed,colorGrey50));
Plot(4, "", Co,styleArea+styleOwnScale | styleNoLabel, -1, 100);
RestorePriceArrays();
_SECTION_END();

BuyPrice=(DayL+AF);
BuyTP1=(BuyPrice+(BuyPrice*(PerctakeProfit/100)));
BuyTP2=(C>=BuyTP1);
SellPrice=(DayH-AF);
SellTP1=(SellPrice-(SellPrice*(PerctakeProfit/100)));
SellTP2=(C<=SellTP1);
percchange=(((C-TOP)/TOP)*100);
Vol=(V>=Volmin AND V<=Volmax);
Percentage=(percchange>=PercChangemin AND percchange<=PercChangemax);
prc=(C>=priceRL AND C<=priceRH);
BuyStop1=(BuyPrice-(BuyPrice*(PercStoploss/100)));
BuyStop2=IIf((BuyStop1<=SellPrice) AND SellPrice<=BuyPrice,SellPrice,BuyStop1);
SellStop1=(SellPrice+(SellPrice*(PercStoploss/100)));
SellStop2=IIf((SellStop1>=BuyPrice) AND SellPrice<=BuyPrice, BuyPrice,SellStop1);

BuyStop=IIf((Buy AND NOT BuyTP2),BuyStop2,Null);
BuyTP=IIf(Buy AND NOT BuyStop,BuyTP2,Null);

Bars = BarsSince(TimeNum() >= 85400 AND TimeNum() < 092900);
x0 = BarCount-LastValue(Bars);
x1 = BarCount-1;
TOP_Line = LineArray(x0,LastValue(TOP),x1,LastValue(TOP),0);
PDH_Line = LineArray(x0,LastValue(PDH),x1,LastValue(PDH),0);
PDL_Line = LineArray(x0,LastValue(PDL),x1,LastValue(PDL),0);
PDC_Line = LineArray(x0,LastValue(PDC),x1,LastValue(PDC),0);
PDM_Line = LineArray(x0,LastValue(PDM),x1,LastValue(PDM),0);
FHH_Line = LineArray(x0,LastValue(FHH),x1,LastValue(FHH),0);
FHL_Line = LineArray(x0,LastValue(FHL),x1,LastValue(FHL),0);
BuyPriceline=LineArray(x0,LastValue(BuyPrice),x1,L astValue(BuyPrice),0);
BuyStopline=LineArray(x0,LastValue(BuyStop2),x1,La stValue(BuyStop2),0);
BuyTPline=LineArray(x0,LastValue(BuyTP1),x1,LastVa lue(BuyTP1),0);
SellPriceline=LineArray(x0,LastValue(SellPrice),x1 ,LastValue(SellPrice),0);
SellStopline=LineArray(x0,LastValue(SellStop2),x1, LastValue(SellStop2),0);
SellTPline=LineArray(x0,LastValue(SellTP1),x1,Last Value(SellTP1),0);
DayHline=LineArray(x0,LastValue(DayH),x1,LastValue (DayH),0);
DayLline=LineArray(x0,LastValue(DayL),x1,LastValue (DayL),0);


Plot(IIf(pShowtradeLines,BuyStopline,Null),"BuySto p",colorBrightGreen,styleDots|styleNoRescale| styleNoLine);
Plot(IIf(pShowtradeLines,SellPriceline,Null),"Shor t Here",colorRed,styleDots|styleNoRescale);
//PlotShapes(IIf(pShowMarkers AND Buy, shapeHollowUpArrow, Null), colorDarkGreen, 0,L,Offset=-30);

if( Status("action") == actionIndicator )
(
Title = EncodeColor(colorWhite)+ "Trading System" + " - " + Name() + " - " + EncodeColor(colorYellow)+ Interval(2) + EncodeColor(colorYellow) +
" - " + Date() +" - "+ EncodeColor(colorYellow) + "-Open="+WriteVal(O,1) + EncodeColor(colorYellow) + "- High= "+ WriteVal(H,1)+ EncodeColor(colorYellow) +

"- Low= "+ WriteVal(L,1)+ EncodeColor(colorYellow) + "- Close= "+ WriteVal(C,1)+ EncodeColor(colorYellow) + "- Vol= "+ WriteVal(V,1)+("\n")
+WriteIf(Percchange, " % Change = "+(Percchange)+" ","")+" Previous DayHigh="+WriteVal(PDH,1)+", Previous DayLow="+WriteVal(PDL,1)+", Today

High="+WriteVal(DayH,1)+", Todays Low="+WriteVal(DayL,1)+
WriteIf(Hac>BG3,EncodeColor(colorBrightGreen)+"+Up ",
WriteIf(Hac<BR3,EncodeColor(colorRed)+"-Down",EncodeColor(colorLightYellow)+"< Flat >")));

GfxSetOverlayMode( mode = 0 );
GfxSelectPen( colorLightBlue, 3 );
GfxSelectSolidBrush( colorLightYellow );
GfxRoundRect( 20, 55, 180, 175, 15, 15 );
GfxSetBkMode(1);
GfxSelectFont( "Arial", 10, 700, False );
GfxSetTextColor( colorBrown );
GfxSetTextAlign(0);
GfxTextOut( WriteIf(SellPrice, "TRP level: "+(SellPrice),""), 30, 60);
GfxTextOut( WriteIf(BuyPrice, "Buy Above: "+(BuyPrice),""), 30, 75);
GfxTextOut( WriteIf(BuyStop2, "Long SL: "+(BuyStop2),""), 30, 90);
GfxTextOut( WriteIf(BuyTP1 , "Long Target 1: "+(BuyTP1),""), 30, 105);
GfxTextOut( WriteIf(SellPrice, "Sell Below: "+(SellPrice),""), 30, 120);
GfxTextOut( WriteIf(SellStop2, "Short SL: "+(SellStop2),""), 30, 135);
GfxTextOut( WriteIf(SellTP1, "Short Target: "+(SellTP1),""), 30, 150);

AddColumn(V,"Volume",1.0);
AddColumn(Percchange,"Change %",1.2);
AddColumn(BuyPrice,"Buy at",1.2);
AddColumn(BuyStop,"Buy Stop at",1.2);
AddColumn(BuyTP1,"Buy Profit at",1.2);
AddColumn(SellPrice,"Short at",1.2);
AddColumn(SellTP1,"Short profit at",1.2);

}

_SECTION_END();

_SECTION_BEGIN("short signal");
HaClose=(O+H+L+C)/4;
HaOpen = AMA( Ref( HaClose, -1 ), 0.5 );
HaHigh = Max( H, Max( HaClose, HaOpen ) );
HaLow = Min( L, Min( HaClose, HaOpen ) );
BG2=HHV(LLV(Low,4)+ATR(4),8);
BR2=LLV(HHV(High,4)-ATR(4),8);
SetBarFillColor( IIf(O <C, colorSeaGreen,colorOrange) );
k = Optimize("K",Param("K",1.75,1,5,0.25),1,5,0.25);
Per= Optimize("atr",Param("atr",10,3,30,1),3,30,1);
j=HaClose;
nm= (H-L);
rfsctor = WMA(nm, PER);
revers = K * rfsctor;
Trend = 1;
NW[0] = 0;
for(i = 1; i < BarCount; i++)
{
if(Trend[i-1] == 1)
{
if(j < NW[i-1])
{
Trend = -1;
NW = j + Revers;
}
else
{
Trend = 1;
if((j - Revers) > NW[i-1])
{
NW = j - Revers;
}
else
{
NW = NW[i-1];
}
}
}
if(Trend[i-1] == -1)
{
if(j > NW[i-1])
{
Trend = 1;
NW = j - Revers;
}
else
{
Trend = -1;
if((j + Revers) < NW[i-1])
{
NW = j + Revers;
}
else
{
NW = NW[i-1];
}
}
}
}

Plot(NW, "", IIf(Trend == 1, 6, 4), 4);

Buy=Cross(j,nw);
Short=Cross(nw,j);
Sell=Cross(nw,j);
Cover=Cross(j,nw);
Buy=ExRem(Buy,Sell);
Sell=ExRem(Sell,Buy);
Short=ExRem(Short,Cover);
Cover=ExRem(Cover,Short);
//dist = 1.5*ATR(15);
for( i = 0; i < BarCount; i++ )
{
if( Buy ) PlotText( "Buy@" + O[ i ], i, L[ i ]-Trend, colorDarkBlue, colorYellow );
if( Sell ) PlotText( "Sell@" +H[ i ], i-4, L[ i ]+Trend, colorRed, colorYellow );
}

PlotShapes(IIf(Buy, shapeUpArrow, shapeNone),colorWhite, 0,halow,-30);
PlotShapes(IIf(Sell, shapeHollowDownTriangle, shapeNone),colorWhite, 0,hahigh,-15);
PlotShapes(IIf(Cover, shapeHollowUpTriangle, shapeNone),colorWhite, 0,halow,-15);
PlotShapes(IIf(Short, shapeDownArrow, shapeNone),colorWhite, 0,hahigh,-30);
//-----------end--------------

================================================== =======


//Code ends here





The maximum times you will find error only because there will one single space extra in some lines, just you have to remove those extra spaces
For example when I verify for syntax error for the above afl , i get the errors displayed at the bottom of the editor
When you click on the error message line at the bottom, it will show the error at the exact point in that line of the code, go there and remove that extra space.
That's it

See some errors in the above afl

The editor shows error in the line

PlotOHLC(Open,High,Low,Close,"",colorWhite,styleCa ndle);

Can you notice the extra space in "Candle" word "Ca ndle". Just you have to remove it
Hope this helps you all.

Maximum times there will be only syntax error only
Very few cases there will be some function errors. Then you are always very near to the experts in Tradeji to help you out.

Excuse me if there are some grammatical error
 
Last edited:

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