[R] the matrix of rows with specific row sums

[Rajarshi Guha]

On Tue, 2005-11-22 at 16:00 -0500, Rajarshi Guha wrote:
> 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

Actually there was a mistake. It should read as

> > idx <- which(apply(m, 1, sum) == 2)

 
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