Dear Alberto,
One way would be:

m1[ m1[,1] %in% m2, ]

See ?"%in%" for more details.

HTH,

Jorge


On Mon, Jul 20, 2009 at 7:06 AM, Alberto Lora M <albertoloram@gmail.com>wrote:

> Hi could yelp me with this
>
> Suppose that we have the following matrix
>
>  m1<-matrix(c("a","e","a","i","o","u","i","1","2","3","4","5","6","7"),
> ncol=2)
> m2<-c("a","i")
>  m1
>     [,1] [,2]
> [1,] "a"  "1"
> [2,] "e"  "2"
> [3,] "a"  "3"
> [4,] "i"  "4"
> [5,] "o"  "5"
> [6,] "u"  "6"
> [7,] "i"  "7"
>
>
>
> I want to obtain a new matrix with the rows from m1 where values of m2 are
> present
>
> for instance
>     [,1] [,2]
> [1,] "a"  "1"
> [3,] "a"  "3"
> [4,] "i"  "4"
> [7,] "i"  "7"
>
> Bets Regards
>
> --
> Alberto Lora Michiels
> Rue du Progrès,  6B
> 7860 Lessines
> GSM 32(0)496659457
>
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