On Fri, Mar 4, 2011 at 8:50 AM, purna <mij...@live.se> wrote:
> Rnoob here.
> I have a matrix of zeroes ond ones. I want to delete the rows whose sum of
> values is not =5, alternatively extract the rows who sum up to 5.
>
> Thank you/Mikael
I think you would greatly benefit from reading some of the intro to R
materials that are widely available.
> mymat <- matrix(sample(c(1,0), 100, r=TRUE), ncol=10)
> rowSums(mymat)
[1] 3 4 3 6 3 4 5 7 7 3
> mymat[rowSums(mymat) == 5, , drop=FALSE]
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,] 0 0 0 1 1 1 0 0 1 1
> mymat[rowSums(mymat) != 5, , drop=FALSE]
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,] 0 1 1 0 0 0 0 0 1 0
[2,] 0 1 0 1 0 0 0 0 1 1
[3,] 0 0 0 0 1 0 0 1 1 0
[4,] 0 1 0 1 1 1 1 0 0 1
[5,] 1 0 1 0 0 1 0 0 0 0
[6,] 1 1 1 0 0 0 0 1 0 0
[7,] 1 1 0 1 1 1 1 0 1 0
[8,] 1 0 1 1 1 1 1 1 0 0
[9,] 0 0 0 0 0 0 1 0 1 1
Sarah
--
Sarah Goslee
http://www.functionaldiversity.org
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