Kindly add buy sell variables

#1
Hai seniors and experts .
I am testing supertrend for my Algo trading .But i am facing some difficulties . Sometimes it does not gives buy signal in some scripts although it is giving sell signal .
Kindly please correct the buy sell variables .
Currently i am using this




Plot(NW, "", IIf(Trend == 1, 27, 4), 4);
Buy=NW<HACLOSE;
Sell=NW>HACLOSE;
SellPrice=ValueWhen(Sell,C,1);
BuyPrice=ValueWhen(Buy,C,1);
Buy=ExRem(Buy,Sell);
Sell=ExRem(Sell,Buy );

Short=Sell;
Cover=Buy;


NMAB= NW<HACLOSE;
NMAS= NW>HACLOSE
 

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