How can I find and replace decimal numbers among whole numbers in a column in R?

Question

I am working with a dataset that came from a machine. In one column, all values are whole numbers without any decimals, but sometimes the machine recorded some numbers with

Answer 1

If your dataframe is called df and the column is V1 you can identify values which are decimals by

df$V1 %% 1 != 0
#[1] FALSE FALSE FALSE FALSE FALSE FALSE FALSE  TRUE FALSE FALSE FALSE FALSE FALSE
#[14] FALSE FALSE FALSE  TRUE FALSE FALSE FALSE FALSE FALSE

If you want to replace these values (let's say with NA)

df$V1[df$V1 %% 1 != 0] <- NA

If you want to drop decimal values you can do :

df <- df[df$V1 %% 1 == 0, , drop = FALSE]