Nothing
`BuildMatrix2` <-
function(n,m){
# CAUTION: This 'n' is rather 'nr'
A1 <- cbind(diag(n),matrix(0,nrow=n,ncol=m),-diag(n))
A2 <- cbind(matrix(rep(1,n+m),nrow=1),matrix(rep(0,n),nrow=1))
A3 <- -A2
A4 <- -diag(n+m+n)
rbind(A1,A2,A3,A4)
}
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