I have a big data set that includes character variables of many different
values. I'm trying to use ff to read the data and then use biglm.big.matrix
to build linear models. However, since big.matrix will convert all
character vectors to factors and the character labels will be lost. I
decided to create a lookup table outside of R for my character columns and
use numbers to represent different levels for R. However, I do not know how
to tell read.table.ffdf these columns should be considered factors instead
of numerics. Please help. thanks.

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