[R] how to get such a subset of a matrix?
Sundar Dorai-Raj
sundar.dorai-raj at pdf.com
Fri May 6 15:34:47 CEST 2005
Xiao Shi wrote on 5/6/2005 6:21 AM:
> 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
>
How about:
a[rowSums(is.na(a)) < 2, ]
HTH,
--sundar
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