From: Dimitris Rizopoulos <dimitris.rizopoulos_at_med.kuleuven.ac.be>

Date: Fri 06 May 2005 - 23:36:51 EST

Dimitris Rizopoulos

Ph.D. Student

Biostatistical Centre

School of Public Health

Catholic University of Leuven

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

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

- Original Message ----- From: "Xiao Shi" <bioconductor.cn@gmail.com> To: <r-help@stat.math.ethz.ch> Sent: Friday, May 06, 2005 3:21 PM Subject: [R] how to get such a subset of a matrix?

> 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
**>
**> [[alternative HTML version deleted]]
**>
**> ______________________________________________
**> 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
**>
*

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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