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[amibroker] How to limit daily transactions



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I 've got code like below. But i don't know how to limit sum of short, buy transaction to 1. At whis moment i can do it seperatly to short and seperetly to buy. But i need to do it for sum of them - both them together and morover i need them interchangebly ( next possible transaction after buy have to be sell/short). 
Thanks for any help :)

tradesperday=1;
dn = DateNum();
newDay=Ref(dn,-1)!= dn;
bsnd=BarsSince(newDay);
CondBuy=..;
CondShort=..;

LongSignalSum=IIf(newDay,CondBuy,Sum(CondBuy,bsnd));
ShortSignalSum=IIf(newDay,CondShort,Sum(CondShort,bsnd));

Buy= LongSignalSum<=tradesperday AND CondBuy  ;
Sell=ShortSignalSum<=tradesperday AND CondShort ;

Buy = ExRem(Buy, Sell);
Sell = ExRem(Sell, Buy);
Short=Sell;
Cover=Buy;

--
Best regards
raskoks




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