maidenhan 发表于 2012-8-2 08:23
I wish the following code could help.

maidenhan 发表于 2012-8-2 08:23
I wish the following code could help.

jacky1842 发表于 2012-8-2 22:23
非常感谢，，运行了程序，但是有些地方不懂，再请教。

if first.id then fid = 0;

lynette_89 发表于 2012-8-2 22:52
说说我的理解
就是每类如果是id变量的组中第一条，fid就赋0
之后每加一条相同的id变量的obs,fid加1

lynette_89 发表于 2012-8-2 22:52
说说我的理解
就是每类如果是id变量的组中第一条，fid就赋0
之后每加一条相同的id变量的obs,fid加1

maidenhan 发表于 2012-8-3 08:32
Yeah, I agree with u.
Further more, with "fid+1", we don't have to write the retain sentence as " ...