Remove N/A from the Data Frame

Question

Data frame is like

Where i have to remove the rows having atleast one N/A in any column of data frame.

Tried These

   frame1 <- na.omit(frame1)
   is.null(frame1)
   [1] FALSE

Guess there's a difference between NA and N/A How can i remove the rows as explained

Answer 1

A  <- data.frame(x=c(1,2,3,4),
                 y=c(1,2,3,4),
                 z=c(1,"N/A",3,4))

A[A == "N/A"]  <- NA
na.omit(A)

The trick is to change your character values, "N/A" to what R understands to be NA.