请高手帮我做出，'买卖差额'。选股和预警。

A1:=(VOL/CLOSE)/3;
{A222:=IF(A1>0.29 AND CLOSE>REF(CLOSE,1),A1,0);}
{A22:=SUM(A222,0);}
A2:=SUM((IF(((A1>0.20) AND (CLOSE>(REF(CLOSE,1)))),A1,0)),0);
A3:=SUM((IF(((A1>0.20) AND (CLOSE<(REF(CLOSE,1)))),A1,0)),0);
A4:=SUM((IF(((A1<0.29) AND (CLOSE>(REF(CLOSE,1)))),A1,0)),0);
A5:=SUM((IF(((A1<0.29) AND (CLOSE<(REF(CLOSE,1)))),A1,0)),0);
A6:=((A2+A3)+A4)+A5;
A7:=IF((ISLASTBAR=1),((100*A2)/A6),0);
A8:=((IF((ISLASTBAR=1),((100*A3)/A6),0)));
A9:=((IF((ISLASTBAR=1),((100*A4)/A6),0)));
A10:=((IF((ISLASTBAR=1),((100*A5)/A6),0)));
机构买盘红:(A2),LINETHICK3,COLORRED;
机构卖盘绿:(A3),LINETHICK3,COLORGREEN;
散户买盘黄:(A4),COLORYELLOW;
散户卖盘蓝:(A5),COLORBLUE;
预警界线：10.0;
DRAWTEXT(ISLASTBAR=1,机构买盘红*0.9,'机构买盘'),LINETHICK2,COLORRED;
DRAWTEXT(ISLASTBAR=1,机构卖盘绿,'机构卖盘'),LINETHICK2,COLORBROWN;
DRAWTEXT(ISLASTBAR=1,散户买盘黄,'散户买盘'),LINETHICK2,COLORLIGREEN;
DRAWTEXT(ISLASTBAR=1,散户卖盘蓝,'散户卖盘'),LINETHICK2,COLORBLUE;
买卖差额:(机构买盘红-机构卖盘绿)>0.5,LINETHICK6,COLORWHITE;
抄底:IF(CROSS(A2,A3),10,0),LINETHICK3,COLORMAGENTA;

单从句子来看，把你的代码缩减成如下就是条件选股公式了，预警直接选用条件选股公式即可。
(未测试)
A1:=(VOL/CLOSE)/3;
A2:=SUM((IF(((A1>0.20) AND (CLOSE>(REF(CLOSE,1)))),A1,0)),0);

A3:=SUM((IF(((A1>0.20) AND (CLOSE<(REF(CLOSE,1)))),A1,0)),0);
A2-A3>0.5;

但从意义上讲，这里A1的含义费解，表示的到底是什么东西？