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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 [[alternative HTML

hi - i just started using R as i am trying to figure out how perform a linear regression on a huge matrix. i am sure this topic has passed through the email list before but could not find anything in the archives. i have a matrix that is 2,000,000 x 170,000 the values right now are arbitray. i try to allocate this on a x86_64 machine with 16G of ram and i get the following: > x <-