stockid:="SH510050";
EndT:=20170405T;
r:=OP_GetOptionChain(stockid,EndT);
rgo:=sselect ['StockID'] from r where ['期权类型']='认购' end;
rgu:=sselect ['StockID'] from r where ['期权类型']='认沽' end;
setsysparam(pn_cycle(),cy_day());
rgo_vol:=vselect sumof(['vol']) from markettable datekey endt to endt of rgo end;
rgu_vol:=vselect sumof(['vol']) from markettable datekey endt to endt of rgu end;
return rgu_vol/rgo_vol;