First of all when read in you can define the class of each column. It
sounds like you have a non-numeric in that column. If you are not
using factors, then putting 'as.is=TRUE' will make sure that they are
read in as characters. If you want to convert a column to numeric, do
the following:
df$c
Hello dear R-users,
I have a tricky problem of data manipulation with R. Although it seems
very easy, I can not solve it by myselves.
The problem is a variable in my dataset is usually be readed as
"factor" (variable mode), however I want it be a "numeric" one. I want
to know how can I define
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