suppressWarnings(
ScoobyDoo$imdb <- as.numeric(ScoobyDoo$imdb)) %>%
numeric_imdb <- imdb %>%
mutate(imdb = as.numeric(imdb)
)
Error in mutate(., imdb = as.numeric(imdb)) : object 'imdb' not found
ScoobyDoo is the name of the data set and imdb is one of the columns.