请问下面程式不能显示买卖信号，是哪里出了问题？
input:n(5,1,10,1);
atr:ma(high-low,n);
runmode:0;
entertime:=time>=091500 and time<=145500;
exittime:=time>=150000;
atr:="assit.atr#day";
dist:=barslast(date<>ref(date,1))+1;
hh:=ref(hhv(high,dist),1);
ll:=ref(llv(low,dist),1);
buycond:=entertime and low<=hh-atr-mindiff;
buyprice:=hh-atr-mindiff;
buyshortcond:=entertime and high>=ll+atr+mindiff;
buyshortprice:=ll+atr+mindiff;
if holding=0 then begin
if buycond then
buy(1,1,limitr,buyprice);
end
if holding=0 then begin
if buyshortcond then
buyshort(1,1,limitr,buyshortprice);
end
if holding>0 then begin
if exittime then
sell(1,holding,limitr,close);
end
if holding<0 then begin
if exittime then
sellshort(1,holding,limitr,close);
end
收益:(asset-30000)/30000,noaxis,colormagenta;
次数:totaltrade,linethick0;
胜率:percentwin,linethick0;
连亏:maxseqloss,linethick0;
连赢:maxseqwin,linethick0;