Question
I generally work with dataframes and could easily do this for a data frame but on my current project I have the need to replace all zeros with NAs in a table structure. For the following two tables (one using table and the other using ftable) how could I replace all zero counts with NA?
x <- with(mtcars,table(am, gear, cyl, vs))
x2 <- with(mtcars,ftable(am, gear, cyl, vs))
Solution
This should work:
x[x==0] <- NA
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