If the result is limited to just the counts of 1,2 and 3, you can do
the following:
> habs <- matrix(sample(1:3, 50, TRUE, prob=c(.6,.2,.2)),5,10)
> habs
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,] 1 3 2 1 1 3 1 1 1 2
[2,] 1 2 3 1 3 1 1 1 1 1
[3,] 1 2 3 2 3 1 2 1 1 3
[4,] 3 1 3 1 2 2 1 1 1 2
[5,] 1 1 2 2 1 1 3 1 3 2
> result <- apply(habs, 1, function(x){
+ c('1' = sum(x == 1), '2' = sum(x==2), '3' = sum(x == 3))
+ })
> cbind(habs, t(result))
1 2 3
[1,] 1 3 2 1 1 3 1 1 1 2 6 2 2
[2,] 1 2 3 1 3 1 1 1 1 1 7 1 2
[3,] 1 2 3 2 3 1 2 1 1 3 4 3 3
[4,] 3 1 3 1 2 2 1 1 1 2 5 3 2
[5,] 1 1 2 2 1 1 3 1 3 2 5 3 2
On Wed, Jun 8, 2011 at 2:23 AM, the_big_kowalski <bkowal...@csumb.edu> wrote:
> Hi,
>
> I have a matrix
> [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
> [1,] 1 3 1 1 3 1 1 2 3 2
> [2,] 1 3 1 2 1 1 1 2 2 1
> [3,] 1 2 2 3 2 1 1 1 2 1
> [4,] 3 2 1 1 1 3 1 2 1 2
> [5,] 1 1 2 2 1 1 3 1 1 2
> and want to determine how many times 1s, 2s, and 3s occur per each row.
> I tried using 'table', but end up with frequencies for the whole matrix.
> Thanks in advance for your help
>
> --
> View this message in context:
> http://r.789695.n4.nabble.com/determine-frequencies-in-a-matrix-by-row-tp3581733p3581733.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
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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
Data Munger Guru
What is the problem that you are trying to solve?
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