[R] the matrix of rows with specific row sums

[Rajarshi Guha]

On Tue, 2005-11-22 at 21:55 +0100, Serguei Kaniovski wrote:
> mdim=4
> m<-matrix(round(runif(mdim^mdim)),mdim,mdim)

One approach:

> m
     [,1] [,2] [,3] [,4]
[1,]    0    0    1    0
[2,]    0    1    1    0
[3,]    0    0    1    1
[4,]    0    0    0    0
> idx <- apply(m, 1, sum)
> m[idx,]
     [,1] [,2] [,3] [,4]
[1,]    0    0    1    0
[2,]    0    1    1    0
[3,]    0    1    1    0
>

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Rajarshi Guha <rxg218 at psu.edu> <http://jijo.cjb.net>
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