Hi Alberto,
One way would be
index <- apply(m1, 1, function(x) any(x %in% m2))
m1[ index, ]
See ?apply, ?any and ?"%in%" for more details.
HTH,
Jorge
On Mon, Jul 20, 2009 at 4:09 PM, Alberto Lora M <albertolo...@gmail.com>wrote:
> Hi could you yelp me please with this
>
> Suppose that we have the following matrix
>
> m1<-matrix(c("a","7","a","i","o","u","i","1","2","3","4","5","6","7"),
> ncol=2)
> m1
> [,1] [,2]
> [1,] "a" "1"
> [2,] "7" "2"
> [3,] "a" "3"
> [4,] "i" "4"
> [5,] "o" "5"
> [6,] "u" "6"
> [7,] "i" "7"
> m2<-c("a","7")
> I need to obtain all the rows in m1 in which m2 the elements of m2 are
> present
> [,1] [,2]
> [1,] "a" "1"
> [2,] "7" "2"
> [3,] "a" "3"
> [7,] "i" "7"
>
> Thx again
>
>
> --
> Alberto Lora Michiels
> Rue du Progrès, 6B
> 7860 Lessines
> GSM 32(0)496659457
>
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>
>
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