本益成長比

小幫手好

我想盤後選股本益成長比低於0.75的股票，程式碼如下，6/16竟選不出任何股票，想請教程式哪裡有錯，謝謝

value11 = GetField("本期稅後淨利");;

value21 =value11/value11[1]-1;//季增率

value31 =value11/value11[4]-1;//去年同季年增率

value41 =getfield("稅後淨利成長率","Y");//去年底

value1 = getfield("本益比","D") / getfield("稅後淨利成長率","Y");

value2 = getfield("本益比","D") / value21;

value3 = getfield("本益比","D") / value31;

if value41>0 and value1<0.75 

then ret = 1;