[amibroker] Simple Look-ahead checker

["Herman vandenBergen" <psytek@xxxxxxxx>]

Hello here is some simple code I use to verify my system's code. It uses the
Param() to remove bars from the end of your data array. As you remove data
from the end of your chart you can observe whether trade signals/indicators
behave properly, for example, if arrows disappear prematurily your code is
looking ahead.

Herman.

Z = -1e10;
LB =LastValue(BarIndex());
RM = Param("RemoveBars",0,0,100,1);
O = IIf(BarIndex()>=(LB-RM),Z,O);
H = IIf(BarIndex()>=(LB-RM),Z,H);
L = IIf(BarIndex()>=(LB-RM),Z,L);
C = IIf(BarIndex()>=(LB-RM),Z,C);

// Steve Karnish's StoRSI as posted on the list earlier
// example only: substitute your own system's code
StochRsi=EMA((RSI(8)-LLV(RSI(8),8))/(HHV(RSI(8),8)-LLV(RSI(8),8)),3)*100;
Buy=Cross(17,StochRsi) AND Ref(MA(C,21),-1) < MA(C,21);;
Sell=Cross(StochRsi,83);
Short=Cross(StochRsi,83) AND Ref(MA(C,21),-1) > MA(C,21);
Cover=Cross(17,StochRsi);

Plot(C,"Close",2,1);
PlotShapes(IIf(Buy,shapeUpArrow,IIf(Short,shapeDownArrow,shapeNone)),
IIf(Buy,colorBrightGreen,IIf(Short,colorRed,colorBlack)));


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