> marks_matrix(c(20,23,18,48,16,15,18,40,25,20,22,40,14,19,18,42),byrow=T, + nrow=4,dimnames=list(NULL,c("Test1","Test2","Test3","Final")))b)
> marks_rbind(marks,c(10,15,14,30)) > marks Test1 Test2 Test3 Final [1,] 20 23 18 48 [2,] 16 15 18 40 [3,] 25 20 22 40 [4,] 14 19 18 42 [5,] 10 15 14 30c)
> marks[5,2]_17 > marks Test1 Test2 Test3 Final [1,] 20 23 18 48 [2,] 16 15 18 40 [3,] 25 20 22 40d)
> marks[marks[,1]>16,4] [1] 48 40e)
> marks[,-3] Test1 Test2 Final [1,] 20 23 48 [2,] 16 15 40 [3,] 25 20 40 [4,] 14 19 42 [5,] 10 17 30f)
> nrow(marks) [1] 5