面试时被问到的一个双set的问题

lynette_89 发表于 2012-8-18 23:21
呵呵 么四么四   祝你成功

成功了！ 谢谢～

bobguy 发表于 2012-8-15 10:20
There are many more combination of set usages. It really depends how much one is understanding.

H ...

老兄可否给予解释nobs是什么意思？

还有nobs=nobs又是干什么的？

不胜感谢，谢谢。

您好，为什么b的第一个观测为空，整体观测下拉了一个呢？

bobguy 发表于 2012-8-15 10:20
There are many more combination of set usages. It really depends how much one is understanding.

H ...

大神，求解答结果。实在看不懂。