基本上依照Youtube去寫保力加通道AFL，請問為何仍不成
各位師兄好︰小弟想寫一套Code，在保力加底部買入，在保力加頂部沽空，已盡力在網上找尋參考資源，看到此一影片youtube有一保力加AFL教學(本想貼上連結，我卻沒有權限)。
小弟基本上照足，只是他是在頂部買入，底部賣出，和保力加參數有所修改，但不明白我寫的，有好些訊號未到頂便沽空，未到底便買入，實在不知問題在哪裡，希望獲得各位指教，無言感謝！
BolliTop = BBandTop (C, 25, 1);
BolliBot = BBandBot (C, 25, 1);
Buy = C <= BolliBot;
Short = C >= BolliTop;
Buy = ExRem( Buy, Short );
Short = ExRem( Short, Buy );
Cover = Buy;
Sell = Short;
SetPositionSize(1000,spsShares);
/* Plot Buy and Sell Signal Arrows */
shape = Buy * shapeUpArrow + Short * shapeDownArrow;
PlotShapes( shape, IIf( Buy, colorGreen, colorRed ), 0, IIf( Buy, Low, High ) );
GraphXSpace = 5;
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