主题：修改程序化模型

if 买=1 then begin
 SELLSHORT(holding<0,1,MARKET);
 buy(holding=0,1,MARKET);
end
if 卖=1 then begin
 SELL(holding>0,1,MARKET);
 buySHORT(holding=0,1,MARKET);
end
if ref(low,ENTERBARS+3)>close and HOLDING>0 then begin
 SELL(1,1,MARKET);
end
if ref(HIGH,ENTERBARS+3)>close and  HOLDING<0 then begin
 SELLshort(1,1,MARKET);
end