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Have been studying AFL and ran across the following code puzzle.
Comments should explain the mystery I have encountered.
/*
Simple Buy / Sell Indicator based on a % Increase / Decrease
*/
LookBack = Param("Lookback Periods", 12, 5, 40); // No adjustment
required if code functions properly - Just set it at 25 or so.
SetPoint = Param("Buy/Sell %",8,4,10);
Color = IIf(C >=Ref(C,-1),colorGreen,colorRed);
Yscale = 50;
Title = " " + Name() + " - " + EncodeColor(colorRed) +Setpoint + "%"
+ EncodeColor(colorGreen) + " Buy " + EncodeColor(colorBlack)
+ " / " + EncodeColor(colorRed) + " Sell (" + LookBack + ") ";
// Search backwards to find the first occurence of HHV or LLV that
exceeds % setpoint
N = 1;
do
{
Change = ((C - LLV(C,N)) / LLV(C,N)) * 100; // Percent change
Buy = Cross(Change,Setpoint);
Change = ((C - HHV(C,N)) / HHV(C,N)) * 100; // Percent change
Sell = Cross(-Setpoint,Change);
// Catch the first HHV or LLV exceeding the setpoint, exit the
search loop and display it.
// Can't figure out why the next line NEVER finds a Buy or Sell !!
// In fact, can't find any other test that will !!
N = IIf(LastValue(Buy OR Sell), LookBack + 1, N + 1);
} while(N <= LookBack);
Buy = ExRem(Buy, Sell); Sell = ExRem(Sell, Buy);
GraphXSpace = 1000;
PlotShapes(shapeSmallCircle,Color,0,Yscale, Offset = 0); // Display
a base line
PlotShapes(IIf(Buy,shapeUpArrow,shapeNone),colorGreen,0,Yscale - 1);
PlotShapes(IIf(Sell,shapeDownArrow,shapeNone),colorRed,0,Yscale + 1);
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