Nothing
show.cols.with.na <-
function(x) {
if (class(x) != "data.frame")
stop("x must be a dataframe.\n")
missing.by.column <- apply(is.na(x), 2, sum)
if (sum(missing.by.column) == 0) {
cat("No missing values.\n")
} else {
missing <- which(missing.by.column > 0)
return(missing.by.column[missing])
}
}
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