各位大神，小弟求助關(guān)于三菱work2 用ST語言求20位數(shù)組中值平均數(shù)，要求去掉最大值和最小值。數(shù)組單精度實數(shù)類型，求各位大聲不吝賜教！！！！！！！！！！！！！！！！！！！

rSum:=aData[0];
rMin:=aData[0];
rMax:=aData[0];
FOR index:=1 TO 20 BY 1 DO
    IF rMin > aData[index] THEN
        rMin:=aData[index];
    END_IF;
    IF rMax < aData[index] THEN
        rMax:=aData[index];
    END_IF;        
    rSum:=rSum+aData[index];
END_FOR;
rSum:=rSum-rMax;
rSum:=rSum-rMin;
rAve:=rSum/20.0;