Dear all,
             Rank of a matrix depends on which factors? Only on rows or
coumns?  or both ? If there is a collinearlity in the variables ( columns )
does it effects the rank?



> X<-matrix((rnorm(10000)),50)
> dim(X)
[1]  50 200
> qr(X)$rank
[1] 50
> X[,2]<-X[,30]
> qr(X)$rank
[1] 50
> X[10,]<-X[7,]
> qr(X)$rank
[1] 49

Thanks

Alex

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