Try this:

a[a[,3] < 6,, drop = FALSE]

On Fri, Sep 3, 2010 at 10:08 AM, syrvn <mentor_@gmx.net> wrote:

>
> Hi,
>
> the R code:
>
> a <-
> matrix(c(1,5,4,3,7,10,34,4,3,8,6,5,12,17,45,3,2,45,46,47,3,4,22,12,21),
> nrow=5)
> rownames(a) <- c("a","b","c","d","e")
> a
> a[which(a[,3] < 8), ]
> a[which(a[,3] < 6), ]
>
>
> produces the following output:
>
> > a
>  [,1] [,2] [,3] [,4] [,5]
> a    1   10    6    3    3
> b    5   34    5    2    4
> c    4    4   12   45   22
> d    3    3   17   46   12
> e    7    8   45   47   21
>
> > a[which(a[,3] < 8), ]
>  [,1] [,2] [,3] [,4] [,5]
> a    1   10    6    3    3
> b    5   34    5    2    4
>
> > a[which(a[,3] < 6), ]
> [1]  5 34  5  2  4
>
>
> I actually thought it must be rather easy to somehow extract the row name
> when the result is just a vector as in the second example and not a matrix.
> I tried several ways but without any success.
>
> Any advice?
> Best,
> syrvn
>
>
> --
> View this message in context:
> http://r.789695.n4.nabble.com/how-to-get-row-name-of-matrix-when-result-is-a-vector-tp2525631p2525631.html
> Sent from the R help mailing list archive at Nabble.com.
>
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> PLEASE do read the posting guide
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>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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