Buy and Sell Signal was generated but backtest results was empty.

[him_aeng]

I use the code from empottasch to display HH and LL in charts and made some modification to eliminate the future leak from the code as following

Plot( C, "", IIf( C > O, ColorRGB( 0, 255, 0 ), IIf( C <= O, ColorRGB( 255, 0, 0 ), colorLightGrey ) ), 64, Null, Null, 0, 0, 1 );

// Fractal Pivots, E.M.Pottasch 2/2018
bi = BarIndex();
fvb = FirstVisibleValue( bi );
lvb = LastVisibleValue( bi );

rightstrength = Param( "Right Strength", 5, 1, 50, 1 );
leftstrength = Param( "Left Strength", 5, 1, 50, 1 );
fact = Param( "Chart Time Frame Factor", 1, 1, 10, 1 );

rightStrength = rightStrength * fact;
leftStrength = leftStrength * fact;

pk = 0;
tr = 0;
pkl = 0;
trl = 0;
for( i = lvb; i > fvb; i-- )
{
	j = i  - leftStrength + 1;
	j = IIf(j<0, 0, j);
	LeftHighest = 0;
	LeftLowest =L[j];
	while(j <= i) {
		if (LeftHighest < H[j]) {
			LeftHighest = H[j];
		}
		if (LeftLowest > L[j]) {
			LeftLowest = L[j];
		}
		j = j + 1;
	}
	
	DistantUntilLastBar = (BarCount - 1) - i;
	
	SafeRightStrength = IIf(DistantUntilLastBar >= rightStrength, rightStrength, DistantUntilLastBar);
	k = i + SafeRightStrength;
	RightHighest = 0;
	RightLowest = L[k];
	while(k > i) {
		if (RightHighest < H[k]) {
			RightHighest = H[k];
		}
		if (RightLowest > L[k]) {
			RightLowest = L[k];
		}
		k = k - 1;
	}
	pk[i] = H[i] == LeftHighest AND RightHighest < H[i];
	tr[i] = L[i] == LeftLowest AND RightLowest > L[i];
	pkl[i] = H[i] == LeftHighest;
	trl[i] = L[i] == LeftLowest;
}

for( i = 0; i < 3; i++ )
{
    VarSet( "px" + i, ValueWhen( pk, bi, i ) );
    VarSet( "tx" + i, ValueWhen( tr, bi, i ) );
    VarSet( "ph" + i, ValueWhen( pk, H, i ) );
    VarSet( "tl" + i, ValueWhen( tr, L, i ) );
}

ll = tr AND tl1 < tl2;
hl = tr AND tl1 > tl2;
hh = pk AND ph1 > ph2;
lh = pk AND ph1 < ph2;
dt = pk AND ph1 == ph2;
db = tr AND tl1 == tl2;

Buy = BarsSince(hh) == 1;
Sell = BarsSince(Buy) >= 10;
Sell = ExRem(Sell, Buy);

PlotShapes(Buy * shapeUpArrow, colorGreen, 0, L, -25);
PlotShapes(Sell * shapeDownArrow, colorRed, 0, H, -25);

doubleTopThreshold = 0.75 * Ref( ATR( 20 ), -1 );
doubleTop = pk && abs( ph1 - ph2 ) < doubleTopThreshold;

doubleBottomThreshold = 0.75 * Ref( ATR( 20 ), -1 );
doubleBottom = tr && abs( tl1 - tl2 ) < doubleBottomThreshold;

for( i = lvb; i > fvb; i-- )
{
    sz = 8;

    // troughs
    if( ll[i] )
    {
        str = "LL";
        PlotTextSetFont( str, "Arial Black", sz, i, L[i], ColorRGB( 0, 250, 0 ), colorDefault, -30 );
    }

    if( hl[i] )
    {
        str = "HL";
        PlotTextSetFont( str, "Arial Black", sz, i, L[i], ColorRGB( 0, 250, 0 ), colorDefault, -30 );
    }

    if( db[i] )
    {
        str = "DB";
        PlotTextSetFont( str, "Arial Black", sz, i, L[i], ColorRGB( 0, 250, 0 ), colorDefault, -30 );
    }

    //peaks
    if( hh[i] )
    {
        str = "HH";
        PlotTextSetFont( str, "Arial Black", sz, i, H[i], ColorRGB( 250, 0, 0 ), colorDefault, 20 );
    }

    if( lh[i] )
    {
        str = "LH";
        PlotTextSetFont( str, "Arial Black", sz, i, H[i], ColorRGB( 250, 0, 0 ), colorDefault, 20 );
    }

    if( dt[i] )
    {
        str = "DT";
        PlotTextSetFont( str, "Arial Black", sz, i, H[i], ColorRGB( 250, 0, 0 ), colorDefault, 20 );
    }

    if( doubleTop[i] )
    {
        str = "Double Top";
        PlotTextSetFont( str, "Arial Black", sz, i, H[i], ColorRGB( 250, 125, 0 ), colorDefault, 40 );
    }
    
     if( doubleBottom[i] )
    {
        str = "Double Bottom";
        PlotTextSetFont( str, "Arial Black", sz, i, L[i], ColorRGB( 250, 125, 0 ), colorDefault, -40 );
    }
    
}

writeif( highest( doubleTop ) == 1, "\nAmiBroker has detected some possible Double Top patterns for " + name() + "\n\nLook for TAG on the price chart.", "\n\nThere are no double top patterns for " + name() );
writeif( highest( doubleBottom ) == 1, "\n\nAmiBroker has detected some possible Double Bottom patterns for " + name() + "\n\nLook for TAG on the price chart.", "\nThere are no double top patterns for " + name() );

When I backtest above code, it show zero trade list result. I change the Buy signal code from

Buy = BarsSince(hh) == 1;

to

Buy = C > Ref(HHV(H, 60), -1);

My backtest result list show trade list as normal.

The point is when I use 'old' buy signal to plot green up arrow shape, it show the shape in chart as expected. That's mean Buy array has correct values.

Question is: why the code that can generating correct Buy signal got zero result backtest result?