[R] how to get such a subset of a matrix?

[Liaw, Andy]

Try:

  a[rowSums(is.na(a)) <= 2, ]

Andy

> From: Xiao Shi
> 
> Hi everybody,
> Maybe this question is quite simple but i just don't know how 
> to make it.
> I have a matrix a somewhat like this one but bigger:
> > a
> f g h i j k
> a NA NA 11 16 21 26
> b NA NA 12 17 22 27
> c NA 8 13 18 23 28
> d NA 9 14 19 24 29
> e NA 10 15 20 25 30
> And i want to get the rows which at most have 2 Na.
> Thanks in advance.
> Shi Jiantao
> 
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