Is this what you want:
> 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"
> m1[m1[,1] %in% m2,]
[,1] [,2]
[1,] "a" "1"
[2,] "a" "3"
[3,] "i" "4"
[4,] "i" "7"
>
On Mon, Jul 20, 2009 at 7:06 AM, Alberto Lora M<albertolo...@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
>
> [[alternative HTML version deleted]]
>
>
> ______________________________________________
> R-help@r-project.org mailing list
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>
--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
What is the problem that you are trying to solve?
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