Full_Name: Jiancang Zhuang
Version: 2.3.0
OS: Windows XP, BSD, Linux
Submission from: (NULL) (130.195.2.100)
> a<-matrix(scan(), ncol=3, byrow=T)
1: 6 NA 4
4: 5 3 6
7: 8 2 9
10: 3 6 NA
13:
Read 12 items
> a
[,1] [,2] [,3]
[1,] 6 NA 4
[2,] 5 3 6
[3,] 8 2 9
[4,] 3 6 NA
> a[a[,2]>2,]
[,1] [,2] [,3]
[1,] NA NA NA
[2,] 5 3 6
[3,] 3 6 NA
We may hope the first row of A removed or keep the same. However, R keeps the
first row and changes all the value in that row into NA.
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