Function extracted (with small changes) of the function
to check the type of variables in a data.frame or matrix.
A data.frame or matrix.
A vector with the variable types, where 'c' is continuous/numeric, 'o' is ordinal, 'b' is binary, 'n' is nominal and 'f' is factor.
Vanderlei Julio Debastiani <firstname.lastname@example.org>
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