DataFrame function to determine if an eltype is a floating point number

[Min-Woong Sohn]

Is there a function that I can use if a column in a DataFrame (determined by eltype) is a floating point number or an integer? Another question is what is the best way to determine the maximum length of a string column?

[Cedric St-Jean]

I think you're looking for:

eltype(df[:col_name]) <: AbstractFloat

and

maximum(map(length, df[:col_name]))

[Min-Woong Sohn]

These worked perfectly. Thank you!