From: Robin Hankin <r.hankin_at_noc.soton.ac.uk>

Date: Fri 06 May 2005 - 23:31:45 EST

[5,] 5 11 17 23 29 NA

[6,] 6 12 18 24 30 36

>

Date: Fri 06 May 2005 - 23:31:45 EST

R> a <- matrix(1:36,6,6) R> is.na(a[row(a)<col(a)]) <- TRUE R> a [,1] [,2] [,3] [,4] [,5] [,6] [1,] 1 NA NA NA NA NA [2,] 2 8 NA NA NA NA [3,] 3 9 15 NA NA NA [4,] 4 10 16 22 NA NA

[5,] 5 11 17 23 29 NA

[6,] 6 12 18 24 30 36

> a[apply(a,1,function(x){sum(is.na(x))<=2}),]

[,1] [,2] [,3] [,4] [,5] [,6]

[1,] 4 10 16 22 NA NA [2,] 5 11 17 23 29 NA [3,] 6 12 18 24 30 36

>

Hope this helps

rksh

On May 6, 2005, at 02:21 pm, Xiao Shi wrote:

> 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
**>
**>
*

-- Robin Hankin Uncertainty Analyst National Oceanography Centre, Southampton European Way, Southampton SO14 3ZH, UK tel 023-8059-7743 ______________________________________________ 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.htmlReceived on Fri May 06 23:43:07 2005

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