[R] partially sorting?

Dear all, x <- matrix(c(1239,10,10,10,10,1234,10,10,10,10,1500,11,11,11,11,1001,11,11,11,11, 1009,11,11,11,11,1344,12,12,12,12,1349,12,12,12,12,1458,13,13,13,13),8,5,byrow = T) > x [,1] [,2] [,3] [,4] [,5] [1,] 1239 10 10 10 10 [2,] 1234 10 10 10 10 [3,] 1500

[R] partially sorting?

Dear all, x <- matrix(c(1239,10,10,10,10,1234,10,10,10,10,1500,11,11,11,11,1001,11,11,11,11, 1009,11,11,11,11,1344,12,12,12,12,1349,12,12,12,12,1458,13,13,13,13),8,5,byrow = T) > x [,1] [,2] [,3] [,4] [,5] [1,] 1239 10 10 10 10 [2,] 1234 10 10 10 10 [3,] 1500