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

From: Dimitris Rizopoulos <dimitris.rizopoulos_at_med.kuleuven.ac.be>
Date: Fri 06 May 2005 - 23:36:51 EST

one way to do it is:

mat <- matrix(rnorm(20*20), 20, 20)
mat[sample(400, 40)] <- NA
#####
mat
mat[rowSums(is.na(mat)) <= 2, ]

I hope it helps.

Best,
Dimitris



Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium

Tel: +32/16/336899
Fax: +32/16/337015
Web: http://www.med.kuleuven.ac.be/biostat/
     http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm


> 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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R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Fri May 06 23:46:14 2005

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