[data]
id x
9 85.857097
9 85.857097
11 71.589004
11 71.589004
11 616.605805
11 616.605805
16 181.993409
16 181.993409
16 181.993409
16 181.993409
17 663.526921
17 663.526921
17 747.897821
20 747.897821
20 652.511657
20 652.511657
25 907.469188
25 907.469188
25 920.956264
... ...
y=(11,17,20,...)
[/data]
如上数据id为指标，我想取出id等于y的所有行，即将id等于11,17,20，...的行都取出来形成一个子集.
