[R] Excluding rows from a matrix

[Peter Malewski]

On Mon, 21 Aug 2000, José Ernesto Jardim wrote:

> but I'm unable to (i) select the 3 rows at once, (ii) select the matrix
> excluding those rows.
> 
> How can I do it ?

> x <- matrix(1:10,,2)
> x
     [,1] [,2]
[1,]    1    6
[2,]    2    7
[3,]    3    8
[4,]    4    9
[5,]    5   10
> x[x[,1]%in%c(2,3),]
     [,1] [,2]
[1,]    2    7
[2,]    3    8
> x[!x[,1]%in%c(2,3),]
     [,1] [,2]
[1,]    1    6
[2,]    4    9
[3,]    5   10
> 


??P.

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