In R, How to separate data in a matrix? -

i have following data matrix , want remove of data below number 4. how go doing this?

      [,1] [,2] [1,]    1    5 [2,]    2    6 [3,]    3    7 [4,]    4    8 

you try this:

m <- matrix(1:8, ncol = 2) m[m < 4] <- na #> m #     [,1] [,2] #[1,]   na    5 #[2,]   na    6 #[3,]   na    7 #[4,]    4    8