编写条件：
A:=CURRBARSCOUNT; A1:=DAY!=REF(DAY,2); A2:=BARSLAST(A1)+3; A3:=MA(C,A2); A4:=SUM(AMO,A2)/SUM(VOL,A2)/100; A5:=IF(CAPITAL>0,A4,A3); 现价:IF(A<=CONST(A2),CLOSE,DRAWNULL)COLOR0098FF,LINETHICK1; 均价:IF(A<=CONST(A2),A5,DRAWNULL),COLORFF9800,LINETHICK1; 前收盘:IF(A<=CONST(A2),DYNAINFO(3),DRAWNULL),COLORRED,LINETHICK3; DRAWTEXT(CROSS(现价,REF(均价,1)),均价,'MAI'),COLOR00FFFF; DRAWTEXT(CROSS(现价,前收盘),前收盘,'前收盘'),COLOR00FFFF; 请老师作一个 上穿红线选股编写方法：
A:=CURRBARSCOUNT;
A1:=DAY!=REF(DAY,2);
A2:=BArslAST(A1)+3;
前收盘:=IF(A<=CONST(A2),DYNAINFO(3),DRAWNULL);
REF(C>前收盘,1)=0 AND C>前收盘=1;
