unify_case_type: unify_case_type
In Tazovsky/utilities: Pakiet z różnymi funkcjami użytkowymi

converts selected columns to UPPERCASE or LOWERCASE

1	unify_case_type(DT_frame, cols2lower, cols2upper)

`DT_frame`	data.table
`cols2lower`	character vector; column names to convert to LOWERCASE
`cols2upper`	character vector; column names to convert toUPPERCASE

data.table

1 2	data <- data.table(a = c("X", "y", "Z"), b = c("a", "a", "Aa"), c = c("q", "w", "e")) data2 <- unify_case_type(data, cols2lower = c("a", "b"), cols2upper = "c")